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CONSOLIDATED SCHEDULE OF INVESTMENTS - (Parenthetical)
€ in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Rate
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Rate
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Rate
Sep. 30, 2023
EUR (€)
Rate
Sep. 30, 2023
GBP (£)
Rate
Sep. 30, 2023
CAD ($)
Rate
Sep. 30, 2023
NZD ($)
Rate
Dec. 31, 2022
EUR (€)
Rate
Dec. 31, 2022
GBP (£)
Rate
Dec. 31, 2022
CAD ($)
Rate
Dec. 31, 2022
NZD ($)
Rate
Derivative Instruments Table [Abstract]                          
Derivative Asset, Counterparty Name [Extensible Enumeration]         Royal Bank of Canada [Member]         Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]
Total $ 23.0   $ 23.0   $ (21.0)                
Schedule of Investments [Line Items]                          
% of Net Assets 202.74%   202.74%   227.97% 202.74% 202.74% 202.74% 202.74% 227.97% 227.97% 227.97% 227.97%
% of Total Assets 96.00%   96.00%   97.00% 96.00% 96.00% 96.00% 96.00% 97.00% 97.00% 97.00% 97.00%
Coupon [1]         11.16%         11.16% 11.16% 11.16% 11.16%
Net unrealized gain (loss) for federal tax purposes $ 200.0   $ 200.0   $ (200.0)                
Tax cost basis 21,800.0   21,800.0   22,000.0                
Aggregate gross unrealized loss for federal tax purposes 1,300.0   1,300.0   1,200.0                
Aggregate gross unrealized gain for federal tax purposes 1,500.0   1,500.0   1,000.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 21,928.5   21,928.5   21,779.8                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total unfunded commitments 30.0   30.0   57.0                
Revolving and delayed draw loan commitments                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2,510.1   2,510.1   2,915.8                
Less: funded commitments (470.4)   (470.4)   (526.2)                
Total unfunded commitments 2,039.7   2,039.7   2,389.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions (23.6)   (23.6)   (13.0)                
Total net adjusted unfunded revolving and delayed draw loan commitments 2,016.1   2,016.1   2,376.6                
Equity investment commitments                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 186.9   186.9   119.8                
Less: funded commitments (62.1)   (62.1)   (69.2)                
Total unfunded commitments 124.8   124.8   50.6                
Less: commitments substantially at discretion of the Company 50.7   50.7   50.6                
Total net adjusted unfunded revolving and delayed draw loan commitments 74.1   74.1   0.0                
Senior Direct Lending Program                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4,848.0   4,848.0   4,958.0                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Less: funded commitments (5,094.0)   (5,094.0)   (5,127.0)                
Total unfunded commitments 229.0   229.0   294.0                
Ares Capital Corporation | Senior Direct Lending Program                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Less: funded commitments (1,266.0)   (1,266.0)   (1,274.0)                
Total unfunded commitments 53.0   53.0   68.0                
Ares Capital Corporation | Senior Direct Lending Program | Unfunded commitments                          
Schedule of Investments [Line Items]                          
Other commitment         68.0                
Subordinated certificates of the SDLP                          
Investments Activity And Fair Value Table [Abstract]                          
Interest income 43.0 $ 37.0 129.0 $ 105.0                  
Capital structuring service fees 1.0 7.0 8.0 15.0                  
Fair Value $ 1,216.0   $ 1,216.0   $ 1,249.0                
Subordinated certificates of the SDLP | Ares Capital Corporation                          
Schedule of Investments [Line Items]                          
Ownership percentage of outstanding SDLP Certificates 87.50%   87.50%   87.50% 87.50% 87.50% 87.50% 87.50% 87.50% 87.50% 87.50% 87.50%
Subordinated certificates of the SDLP | Ares Capital Corporation | Minimum                          
Schedule of Investments [Line Items]                          
Ownership percentage of outstanding SDLP Certificates 25.00%   25.00%   25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00%
Non-qualifying assets | Investments, at fair value, and other non-qualifying assets | Customer Concentration Risk                          
Schedule of Investments [Line Items]                          
% of Total Assets, non-qualifying assets     24.00%   25.00%                
Non-controlled affiliate company investments                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     $ 37.3   $ 29.5                
Redemptions (cost)     15.6   52.4                
Sales (cost)     0.0   33.3                
Interest income     12.0   12.5                
Capital structuring service fees     0.0   0.1                
Dividend income $ 1.0 0.0 7.0 1.0 2.0                
Other income     0.0   0.3                
Net realized gains (losses): 0.0 29.0 0.0 6.0 6.1                
Net unrealized gains (losses): 5.0 30.0 19.0 62.0 71.0                
Fair Value 421.0   421.0   364.4                
Controlled affiliate company investments                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     588.9   1,994.8                
Redemptions (cost)     777.7   513.1                
Sales (cost)     0.0   0.0                
Interest income     181.0   194.5                
Capital structuring service fees 0.0 6.0 5.0 13.0 20.0                
Dividend income 63.0 55.0 187.0 173.0 228.2                
Other income 1.0 2.0 3.0 5.0 6.0                
Net realized gains (losses): 0.0 0.0 0.0 19.0 (37.5)                
Net unrealized gains (losses): 0.0 $ (18.0) (1.0) $ (10.0) 1.0                
Fair Value 4,136.0   4,136.0   $ 4,119.7                
Interest rate swap                          
Derivative Instruments Table [Abstract]                          
Upfront Payments/Receipts 0.0   0.0                    
Change in unrealized depreciation (5.0)   (5.0)                    
Total $ (5.0)   $ (5.0)                    
Fixed interest rate (as a percent) 7.00%   7.00%     7.00% 7.00% 7.00% 7.00%        
Notional Amount $ 600.0   $ 600.0                    
Interest rate swap | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                          
Derivative Instruments Table [Abstract]                          
Basis spread on variable rate (as a percent) 2.585%   2.585%     2.585% 2.585% 2.585% 2.585%        
Open Forward Foreign Currency Contract, Identifier [Axis]: CAD, Canadian Imperial Bank of Commerce, Company Settlement Date Oct 27, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 0.0   $ 0.0                    
Derivative Asset, Notional Amount               $ 1          
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 0.0   $ 0.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: CAD, Royal Bank of Canada, Company Settlement Date January 18, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration]         Foreign currency forward contract         Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract
Derivative Liability, Notional Amount         $ 178.0                
Derivative Asset, Notional Amount                       $ 242  
Change in unrealized depreciation         $ (1.0)                
Open Forward Foreign Currency Contract, Identifier [Axis]: CAD, Royal Bank of Canada, Company Settlement Date January 27, 2023, Contract One                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration]         Foreign currency forward contract         Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract
Derivative Liability, Notional Amount         $ 195.0                
Derivative Asset, Notional Amount                       $ 264  
Change in unrealized depreciation         $ (1.0)                
Open Forward Foreign Currency Contract, Identifier [Axis]: CAD, Royal Bank of Canada, Company Settlement Date January 27, 2023, Contract Two                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration]         Foreign currency forward contract         Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract
Derivative Liability, Notional Amount         $ 12.0                
Derivative Asset, Notional Amount                       $ 17  
Change in unrealized depreciation         $ 0.0                
Open Forward Foreign Currency Contract, Identifier [Axis]: CAD, Royal Bank of Canada, Company Settlement Date Oct 10, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 10.0   $ 10.0                    
Derivative Asset, Notional Amount               $ 13          
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 0.0   $ 0.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: CAD, Royal Bank of Canada, Company Settlement Date Oct 19, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 113.0   $ 113.0                    
Derivative Asset, Notional Amount               $ 153          
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 1.0   $ 1.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: CAD, Royal Bank of Canada, Company Settlement Date Oct 27, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 129.0   $ 129.0                    
Derivative Asset, Notional Amount               $ 172          
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 3.0   $ 3.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: EUR, Royal Bank of Canada, Company Settlement Date Jan 26, 2024                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 13.0   $ 13.0                    
Derivative Asset, Notional Amount | €           € 12              
Derivative Asset, Counterparty Name [Extensible Enumeration] Canadian Imperial Bank of Commerce [Member]   Canadian Imperial Bank of Commerce [Member]     Canadian Imperial Bank of Commerce [Member] Canadian Imperial Bank of Commerce [Member] Canadian Imperial Bank of Commerce [Member] Canadian Imperial Bank of Commerce [Member]        
Change in unrealized appreciation $ 0.0   $ 0.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: EUR, Royal Bank of Canada, Company Settlement Date January 27, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration]         Foreign currency forward contract         Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract
Derivative Liability, Notional Amount         $ 159.0                
Derivative Asset, Notional Amount | €                   € 158      
Change in unrealized depreciation         $ (10.0)                
Open Forward Foreign Currency Contract, Identifier [Axis]: EUR, Royal Bank of Canada, Company Settlement Date Oct 27, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 186.0   $ 186.0                    
Derivative Asset, Notional Amount | €           € 167              
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 9.0   $ 9.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: EUR, Royal Bank of Canada, Company Settlement Date Oct 6, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 11.0   $ 11.0                    
Derivative Asset, Notional Amount | €           € 10              
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 0.0   $ 0.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: GBP, Royal Bank of Canada, Company Settlement Date Aug 21, 2026                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 31.0   $ 31.0                    
Derivative Asset, Notional Amount | £             £ 25            
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 1.0   $ 1.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: GBP, Royal Bank of Canada, Company Settlement Date January 27, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration]         Foreign currency forward contract         Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract
Derivative Liability, Notional Amount         $ 145.0                
Derivative Asset, Notional Amount | £                     £ 125    
Change in unrealized depreciation         $ (6.0)                
Open Forward Foreign Currency Contract, Identifier [Axis]: GBP, Royal Bank of Canada, Company Settlement Date Oct 27, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 145.0   $ 145.0                    
Derivative Asset, Notional Amount | £             £ 112            
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 8.0   $ 8.0                    
Open Forward Foreign Currency Contract, Identifier [Axis]: NZD, Royal Bank of Canada, Company Settlement Date January 27, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration]         Foreign currency forward contract         Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract
Derivative Liability, Notional Amount         $ 34.0                
Derivative Asset, Notional Amount                         $ 59
Change in unrealized depreciation         $ (3.0)                
Open Forward Foreign Currency Contract, Identifier [Axis]: NZD, Royal Bank of Canada, Company Settlement Date Oct 27, 2023                          
Derivative Instruments Table [Abstract]                          
Derivative Asset, Type [Extensible Enumeration] Foreign currency forward contract   Foreign currency forward contract     Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract Foreign currency forward contract        
Derivative Liability, Notional Amount $ 42.0   $ 42.0                    
Derivative Asset, Notional Amount                 $ 68        
Derivative Asset, Counterparty Name [Extensible Enumeration] Royal Bank of Canada [Member]   Royal Bank of Canada [Member]     Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member]        
Change in unrealized appreciation $ 1.0   $ 1.0                    
Investment, Identifier [Axis]: 22 HoldCo Limited                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 20.2   20.2                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 20.2   20.2                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 20.2   20.2                    
Investment, Identifier [Axis]: 22 HoldCo Limited, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [2],[3],[4] 30.3   30.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 29.4   $ 29.4                    
Investment, Identifier [Axis]: 2U, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1195.00% [5]   1195.00% [5]   10.16% [1] 1195.00% [5] 1195.00% [5] 1195.00% [5] 1195.00% [5] 10.16% [1] 10.16% [1] 10.16% [1] 10.16% [1]
Total first lien senior secured loans $ 4.7 [2],[3],[4]   $ 4.7 [2],[3],[4]   $ 14.6 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.3 [2],[3],[4]   4.3 [2],[3],[4]   14.3 [6],[7],[8]                
Investment, Identifier [Axis]: ACAS Equity Holdings Corporation                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   0.0                
Fair Value 0.4   0.4   0.4                
Investment, Identifier [Axis]: ACAS Equity Holdings Corporation, Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.4 [4]   0.4 [4]   0.4 [8]                
Investment, Identifier [Axis]: ADF Capital, Inc., ADF Restaurant Group, LLC, and ARG Restaurant Holdings, Inc.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   0.0                
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: ADF Capital, Inc., ADF Restaurant Group, LLC, and ARG Restaurant Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 9.8 [3]   9.8 [3]   8.3 [7],[9]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0 [7],[9]                
Investment, Identifier [Axis]: ADG, LLC and RC IV GEDC Investor LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         14.1                
Less: funded commitments         (14.1)                
Total unfunded commitments         0.0                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.0                
Investment, Identifier [Axis]: ADG, LLC and RC IV GEDC Investor LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.19%         9.19% 9.19% 9.19% 9.19%
Total first lien senior secured loans [6],[7]         $ 9.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 9.3                
Investment, Identifier [Axis]: ADG, LLC and RC IV GEDC Investor LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         11.25%         11.25% 11.25% 11.25% 11.25%
Total first lien senior secured loans [6],[7]         $ 4.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         4.1                
Investment, Identifier [Axis]: ADG, LLC and RC IV GEDC Investor LLC, Membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: ADG, LLC and RC IV GEDC Investor LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [6],[7]         130.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         104.0                
Investment, Identifier [Axis]: ADG, LLC, GEDC Equity, LLC and RC IV GEDC Investor LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     25.3                    
Redemptions (cost)     0.1                    
Sales (cost)     0.0                    
Interest income     1.1                    
Capital structuring service fees     0.0                    
Dividend income     0.0                    
Other income     0.0                    
Net realized gains (losses):     0.0                    
Net unrealized gains (losses):     (5.5)                    
Fair Value 69.9   69.9                    
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 20.0   20.0                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 20.0   20.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 20.0   20.0                    
Investment, Identifier [Axis]: ADG, LLC, GEDC Equity, LLC and RC IV GEDC Investor LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 23.9   $ 23.9                    
Investment, Identifier [Axis]: ADG, LLC, GEDC Equity, LLC and RC IV GEDC Investor LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 9.39%   9.39%     9.39% 9.39% 9.39% 9.39%        
Total first lien senior secured loans [2],[3] $ 14.9   $ 14.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 14.9   14.9                    
Investment, Identifier [Axis]: ADG, LLC, GEDC Equity, LLC and RC IV GEDC Investor LLC, Membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: ADG, LLC, GEDC Equity, LLC and RC IV GEDC Investor LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3] 31.1   31.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 31.1   31.1                    
Investment, Identifier [Axis]: AHR Funding Holdings, Inc. and AHR Parent Holdings, LP, Class B common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [3]   0.1 [3]   0.1 [7]                
Investment, Identifier [Axis]: AHR Funding Holdings, Inc. and AHR Parent Holdings, LP, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 12.7 [3]   12.7 [3]   10.2 [7]                
Investment, Identifier [Axis]: AHR Funding Holdings, Inc. and AHR Parent Holdings, LP, Series A preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 40.6 [3]   $ 40.6 [3]   $ 35.8 [7]                
Investment, Identifier [Axis]: AI Aqua Merger Sub, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 908.00% [5]   908.00% [5]   7.97% [1] 908.00% [5] 908.00% [5] 908.00% [5] 908.00% [5] 7.97% [1] 7.97% [1] 7.97% [1] 7.97% [1]
Total first lien senior secured loans $ 1.0 [2],[3],[10]   $ 1.0 [2],[3],[10]   $ 1.0 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.0 [2],[3],[10]   1.0 [2],[3],[10]   0.9 [6],[7],[11]                
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 11.3   11.3   28.9                
Less: funded commitments (2.6)   (2.6)   (0.4)                
Total unfunded commitments 8.7   8.7   28.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 8.7   8.7   28.5                
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.4 [3]   $ 7.4 [3]   $ 5.7 [7]                
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.22%         10.22% 10.22% 10.22% 10.22%
Total first lien senior secured loans [6],[7]         $ 26.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 26.8                
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1108.00%   1108.00%     1108.00% 1108.00% 1108.00% 1108.00%        
Total first lien senior secured loans [2],[3] $ 30.5   $ 30.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 30.5   $ 30.5                    
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1087.00%   1087.00%     1087.00% 1087.00% 1087.00% 1087.00%        
Total first lien senior secured loans [2],[3] $ 13.7   $ 13.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 13.7   $ 13.7                    
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.61%         10.61% 10.61% 10.61% 10.61%
Total first lien senior secured loans [6],[7]         $ 0.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.4                
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1118.00%   1118.00%     1118.00% 1118.00% 1118.00% 1118.00%        
Total first lien senior secured loans [2],[3] $ 1.9   $ 1.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.9   $ 1.9                    
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1325.00%   1325.00%     1325.00% 1325.00% 1325.00% 1325.00%        
Total first lien senior secured loans [2],[3] $ 0.8   $ 0.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.8   0.8                    
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 51.3 [2],[3]   51.3 [2],[3]   45.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 51.3 [2],[3]   51.3 [2],[3]   45.6 [6],[7]                
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 11.6 [2],[3]   11.6 [2],[3]   10.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.6 [2],[3]   11.6 [2],[3]   10.3 [6],[7]                
Investment, Identifier [Axis]: AI Fire Buyer, Inc. and AI Fire Parent LLC, Second lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 11.2 [2],[3]   11.2 [2],[3]   10.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.2 [2],[3]   11.2 [2],[3]   10.0 [6],[7]                
Investment, Identifier [Axis]: AIM Acquisition, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.7   1.7   1.8                
Less: funded commitments (0.2)   (0.2)   0.0                
Total unfunded commitments 1.5   1.5   1.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.5   $ 1.5   1.8                
Investment, Identifier [Axis]: AIM Acquisition, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1050.00%   1050.00%     1050.00% 1050.00% 1050.00% 1050.00%        
Total first lien senior secured loans [2],[3] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.2   0.2                    
Investment, Identifier [Axis]: APG Intermediate Holdings Corporation and APG Holdings, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.1   0.1                
Sales (cost)     0.0   0.0                
Interest income     1.1   1.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     3.2   (3.0)                
Fair Value 24.9   24.9   21.8                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.1   0.1   0.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.1   0.1   0.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.1   0.1   0.1                
Investment, Identifier [Axis]: APG Intermediate Holdings Corporation and APG Holdings, LLC, Class A membership Units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 8.6                
Investment, Identifier [Axis]: APG Intermediate Holdings Corporation and APG Holdings, LLC, Class A membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 11.7   $ 11.7                    
Investment, Identifier [Axis]: APG Intermediate Holdings Corporation and APG Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.36%         10.36% 10.36% 10.36% 10.36%
Total first lien senior secured loans [6],[7]         $ 13.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         13.2                
Investment, Identifier [Axis]: APG Intermediate Holdings Corporation and APG Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1084.00%   1084.00%     1084.00% 1084.00% 1084.00% 1084.00%        
Total first lien senior secured loans [2],[3] $ 12.9   $ 12.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 12.9   $ 12.9                    
Investment, Identifier [Axis]: APG Intermediate Holdings Corporation and APG Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1068.00%   1068.00%     1068.00% 1068.00% 1068.00% 1068.00%        
Total first lien senior secured loans [2],[3] $ 0.3   $ 0.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.3   0.3                    
Investment, Identifier [Axis]: API Commercial Inc., API Military Inc., and API Space Intermediate, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 6.9 [3],[12]   6.9 [3],[12]   7.3 [7],[9]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.0 [3],[12]   4.0 [3],[12]   3.6 [7],[9]                
Investment, Identifier [Axis]: AQ Sage Buyer, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.3   5.3   6.4                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 5.3   5.3   6.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.3   $ 5.3   $ 6.4                
Investment, Identifier [Axis]: AQ Sage Buyer, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1156.00% [5]   1156.00% [5]   10.70% [1] 1156.00% [5] 1156.00% [5] 1156.00% [5] 1156.00% [5] 10.70% [1] 10.70% [1] 10.70% [1] 10.70% [1]
Total first lien senior secured loans $ 2.9 [2],[3],[4]   $ 2.9 [2],[3],[4]   $ 1.9 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.8 [2],[3],[4]   2.8 [2],[3],[4]   1.8 [6],[7],[8]                
Investment, Identifier [Axis]: AQ Sunshine, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.4   12.4   12.4                
Less: funded commitments (3.3)   (3.3)   (1.4)                
Total unfunded commitments 9.1   9.1   11.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 9.1   $ 9.1   $ 11.0                
Investment, Identifier [Axis]: AQ Sunshine, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.42% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.42% [1] 10.42% [1] 10.42% [1] 10.42% [1]
Total first lien senior secured loans $ 8.4 [2],[3]   $ 8.4 [2],[3]   $ 8.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.2 [2],[3]   $ 8.2 [2],[3]   $ 8.8 [6],[7]                
Investment, Identifier [Axis]: AQ Sunshine, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.42% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.42% [1] 10.42% [1] 10.42% [1] 10.42% [1]
Total first lien senior secured loans $ 5.5 [2],[3]   $ 5.5 [2],[3]   $ 8.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.4 [2],[3]   $ 5.4 [2],[3]   $ 8.3 [6],[7]                
Investment, Identifier [Axis]: AQ Sunshine, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.42% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.42% [1] 10.42% [1] 10.42% [1] 10.42% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 5.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 5.5 [6],[7]                
Investment, Identifier [Axis]: AQ Sunshine, Inc., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 8.9 [2],[3]   $ 8.9 [2],[3]   $ 1.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.6 [2],[3]   $ 8.6 [2],[3]   $ 1.0 [6],[7]                
Investment, Identifier [Axis]: AQ Sunshine, Inc., First lien senior secured loan 5                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.42% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.42% [1] 10.42% [1] 10.42% [1] 10.42% [1]
Total first lien senior secured loans $ 1.0 [2],[3]   $ 1.0 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.0 [2],[3]   $ 1.0 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: AQ Sunshine, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.42% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.42% [1] 10.42% [1] 10.42% [1] 10.42% [1]
Total first lien senior secured loans $ 3.2 [2],[3],[13]   $ 3.2 [2],[3],[13]   $ 1.4 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.1 [2],[3],[13]   3.1 [2],[3],[13]   1.4 [6],[7],[14]                
Investment, Identifier [Axis]: ARES 2007-3R, Subordinated notes                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [4]   0.1 [4]   0.1 [8]                
Investment, Identifier [Axis]: ASP-r-pac Acquisition CO LLC and ASP-r-pac Holdings LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.2   6.2   6.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 6.2   6.2   6.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 6.2   6.2   6.2                
Investment, Identifier [Axis]: ASP-r-pac Acquisition CO LLC and ASP-r-pac Holdings LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.9 [3]   $ 9.9 [3]   $ 19.2 [7]                
Investment, Identifier [Axis]: ASP-r-pac Acquisition CO LLC and ASP-r-pac Holdings LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1163.00% [5]   1163.00% [5]   10.38% [1] 1163.00% [5] 1163.00% [5] 1163.00% [5] 1163.00% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: ATI Restoration, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 59.3   59.3   83.7                
Less: funded commitments (2.5)   (2.5)   (5.8)                
Total unfunded commitments 56.8   56.8   77.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 56.8   $ 56.8   $ 77.9                
Investment, Identifier [Axis]: ATI Restoration, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1052.00% [5]   1052.00% [5]   9.36% [1] 1052.00% [5] 1052.00% [5] 1052.00% [5] 1052.00% [5] 9.36% [1] 9.36% [1] 9.36% [1] 9.36% [1]
Total first lien senior secured loans $ 32.7 [2],[3]   $ 32.7 [2],[3]   $ 33.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 32.7 [2],[3]   $ 32.7 [2],[3]   $ 33.0 [6],[7]                
Investment, Identifier [Axis]: ATI Restoration, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1055.00% [5]   1055.00% [5]   9.65% [1] 1055.00% [5] 1055.00% [5] 1055.00% [5] 1055.00% [5] 9.65% [1] 9.65% [1] 9.65% [1] 9.65% [1]
Total first lien senior secured loans $ 76.8 [2],[3]   $ 76.8 [2],[3]   $ 8.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 76.8 [2],[3]   $ 76.8 [2],[3]   $ 8.2 [6],[7]                
Investment, Identifier [Axis]: ATI Restoration, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1057.00%   1057.00%     1057.00% 1057.00% 1057.00% 1057.00%        
Total first lien senior secured loans [2],[3] $ 1.5   $ 1.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.5   $ 1.5                    
Investment, Identifier [Axis]: ATI Restoration, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1250.00% [5]   1250.00% [5]   11.50% [1] 1250.00% [5] 1250.00% [5] 1250.00% [5] 1250.00% [5] 11.50% [1] 11.50% [1] 11.50% [1] 11.50% [1]
Total first lien senior secured loans $ 2.3 [2],[3],[13]   $ 2.3 [2],[3],[13]   $ 4.7 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.3 [2],[3],[13]   2.3 [2],[3],[13]   4.7 [6],[7],[14]                
Investment, Identifier [Axis]: Absolute Dental Group LLC and Absolute Dental Equity, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     13.2   2.0                
Redemptions (cost)     11.4   3.0                
Sales (cost)     0.0   0.0                
Interest income     6.3   6.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.1   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (1.5)   4.6                
Fair Value 72.5   72.5   70.2                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.1   7.1   7.1                
Less: funded commitments (5.1)   (5.1)   (3.2)                
Total unfunded commitments 2.0   2.0   3.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.0   2.0   3.9                
Investment, Identifier [Axis]: Absolute Dental Group LLC and Absolute Dental Equity, LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 13.4 [3]   $ 13.4 [3]   $ 14.9 [7]                
Investment, Identifier [Axis]: Absolute Dental Group LLC and Absolute Dental Equity, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 14.65% [5]   14.65% [5]   13.73% [1] 14.65% [5] 14.65% [5] 14.65% [5] 14.65% [5] 13.73% [1] 13.73% [1] 13.73% [1] 13.73% [1]
Total first lien senior secured loans $ 54.1 [2],[3]   $ 54.1 [2],[3]   $ 52.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 54.1 [2],[3]   $ 54.1 [2],[3]   $ 52.1 [6],[7]                
Investment, Identifier [Axis]: Absolute Dental Group LLC and Absolute Dental Equity, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 14.65%   14.65%     14.65% 14.65% 14.65% 14.65%        
Total first lien senior secured loans [2],[3] $ 5.0   $ 5.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 5.0   5.0                    
Investment, Identifier [Axis]: Absolute Dental Group LLC and Absolute Dental Equity, LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.50%         15.50% 15.50% 15.50% 15.50%
Total first lien senior secured loans [6],[7]         $ 2.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 2.2                
Investment, Identifier [Axis]: Absolute Dental Group LLC and Absolute Dental Equity, LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         13.77%         13.77% 13.77% 13.77% 13.77%
Total first lien senior secured loans [6],[7]         $ 1.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         1.0                
Investment, Identifier [Axis]: Abzena Holdings, Inc. and Astro Group Holdings Ltd.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.1                
Less: funded commitments         0.0                
Total unfunded commitments         0.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         0.1                
Investment, Identifier [Axis]: Abzena Holdings, Inc. and Astro Group Holdings Ltd., A ordinary shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   $ 6.5 [7],[8]                
Investment, Identifier [Axis]: Abzena Holdings, Inc. and Astro Group Holdings Ltd., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         14.54%         14.54% 14.54% 14.54% 14.54%
Total first lien senior secured loans [6],[7],[8]         $ 61.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         59.8                
Investment, Identifier [Axis]: Accession Risk Management Group, Inc. and RSC Insurance Brokerage, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.9   10.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 10.9   10.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 10.9   $ 10.9                    
Investment, Identifier [Axis]: Accession Risk Management Group, Inc. and RSC Insurance Brokerage, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1102.00%   1102.00%     1102.00% 1102.00% 1102.00% 1102.00%        
Total first lien senior secured loans [2],[3] $ 32.6   $ 32.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 31.6   31.6                    
Investment, Identifier [Axis]: Accommodations Plus Technologies LLC and Accommodations Plus Technologies Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.1   4.1   4.1                
Less: funded commitments (4.1)   (4.1)   (4.1)                
Total unfunded commitments 0.0   0.0   0.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0   0.0                
Investment, Identifier [Axis]: Accommodations Plus Technologies LLC and Accommodations Plus Technologies Holdings LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.5   $ 10.5   $ 6.6                
Investment, Identifier [Axis]: Accommodations Plus Technologies LLC and Accommodations Plus Technologies Holdings LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon 1229.00% [5]   1229.00% [5]   12.48% [1] 1229.00% [5] 1229.00% [5] 1229.00% [5] 1229.00% [5] 12.48% [1] 12.48% [1] 12.48% [1] 12.48% [1]
Total first lien senior secured loans $ 4.1 [2],[3]   $ 4.1 [2],[3]   $ 4.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.1 [2],[3]   $ 4.1 [2],[3]   $ 4.1 [6],[7]                
Investment, Identifier [Axis]: Acrisure, LLC and Acrisure Finance, Inc., Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         700.00%         700.00% 700.00% 700.00% 700.00%
Total first lien senior secured loans [7],[11]         $ 0.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[11]         0.5                
Investment, Identifier [Axis]: Acrisure, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1112.00%   1112.00%     1112.00% 1112.00% 1112.00% 1112.00%        
Total first lien senior secured loans [2],[3],[10] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[10] 0.2   0.2                    
Investment, Identifier [Axis]: Activate Holdings (US) Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.6   3.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 3.6   3.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.6   $ 3.6                    
Investment, Identifier [Axis]: Activate Holdings (US) Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1214.00%   1214.00%     1214.00% 1214.00% 1214.00% 1214.00%        
Total first lien senior secured loans [2],[3],[4] $ 43.1   $ 43.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 42.6   42.6                    
Investment, Identifier [Axis]: Advarra Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.3   0.3   0.4                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.3   0.3   0.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.3   $ 0.3   $ 0.4                
Investment, Identifier [Axis]: Advarra Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1057.00% [5]   1057.00% [5]   10.15% [1] 1057.00% [5] 1057.00% [5] 1057.00% [5] 1057.00% [5] 10.15% [1] 10.15% [1] 10.15% [1] 10.15% [1]
Total first lien senior secured loans $ 4.0 [2],[3]   $ 4.0 [2],[3]   $ 4.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.0 [2],[3]   $ 4.0 [2],[3]   $ 3.9 [6],[7]                
Investment, Identifier [Axis]: Aero Operating LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1440.00% [5]   1440.00% [5]   13.24% [1] 1440.00% [5] 1440.00% [5] 1440.00% [5] 1440.00% [5] 13.24% [1] 13.24% [1] 13.24% [1] 13.24% [1]
Total first lien senior secured loans $ 35.9 [2],[3]   $ 35.9 [2],[3]   $ 36.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 30.9 [2],[3]   $ 30.9 [2],[3]   $ 35.1 [6],[7]                
Investment, Identifier [Axis]: Aero Operating LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1440.00% [5]   1440.00% [5]   13.24% [1] 1440.00% [5] 1440.00% [5] 1440.00% [5] 1440.00% [5] 13.24% [1] 13.24% [1] 13.24% [1] 13.24% [1]
Total first lien senior secured loans $ 1.1 [2],[3]   $ 1.1 [2],[3]   $ 1.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.0 [2],[3]   1.0 [2],[3]   1.1 [6],[7]                
Investment, Identifier [Axis]: AffiniPay Midco, LLC and AffiniPay Intermediate Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 45.6   45.6   45.6                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 45.6   45.6   45.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 45.6   $ 45.6   $ 45.6                
Investment, Identifier [Axis]: AffiniPay Midco, LLC and AffiniPay Intermediate Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1020.00% [5]   1020.00% [5]   10.64% [1] 1020.00% [5] 1020.00% [5] 1020.00% [5] 1020.00% [5] 10.64% [1] 10.64% [1] 10.64% [1] 10.64% [1]
Total first lien senior secured loans $ 62.9 [2],[3]   $ 62.9 [2],[3]   $ 120.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 62.9 [2],[3]   $ 62.9 [2],[3]   $ 115.7 [6],[7]                
Investment, Identifier [Axis]: AffiniPay Midco, LLC and AffiniPay Intermediate Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1039.00% [5]   1039.00% [5]   10.45% [1] 1039.00% [5] 1039.00% [5] 1039.00% [5] 1039.00% [5] 10.45% [1] 10.45% [1] 10.45% [1] 10.45% [1]
Total first lien senior secured loans $ 119.7 [2],[3]   $ 119.7 [2],[3]   $ 63.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 119.7 [2],[3]   119.7 [2],[3]   60.8 [6],[7]                
Investment, Identifier [Axis]: AffiniPay Midco, LLC and AffiniPay Intermediate Holdings, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 63.3 [2],[3]   63.3 [2],[3]   56.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 63.3 [2],[3]   $ 63.3 [2],[3]   $ 54.4 [6],[7]                
Investment, Identifier [Axis]: Aimbridge Acquisition Co., Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1294.00% [5]   1294.00% [5]   11.62% [1] 1294.00% [5] 1294.00% [5] 1294.00% [5] 1294.00% [5] 11.62% [1] 11.62% [1] 11.62% [1] 11.62% [1]
Total first lien senior secured loans $ 22.5 [3]   $ 22.5 [3]   $ 22.5 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 22.1 [3]   22.1 [3]   21.8 [7]                
Investment, Identifier [Axis]: Alcami Corporation and ACM Note Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.6   2.6   6.6                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.6   2.6   6.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.6   $ 2.6   $ 6.6                
Investment, Identifier [Axis]: Alcami Corporation and ACM Note Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1242.00% [5]   1242.00% [5]   11.42% [1] 1242.00% [5] 1242.00% [5] 1242.00% [5] 1242.00% [5] 11.42% [1] 11.42% [1] 11.42% [1] 11.42% [1]
Total first lien senior secured loans $ 9.4 [2],[3]   $ 9.4 [2],[3]   $ 9.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 9.4 [2],[3]   9.4 [2],[3]   9.0 [6],[7]                
Investment, Identifier [Axis]: Alcami Corporation and ACM Note Holdings, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 20.7 [3]   20.7 [3]   19.5 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 20.7 [3]   $ 20.7 [3]   $ 19.5 [7]                
Investment, Identifier [Axis]: Alera Group, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.42% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.42% [1] 10.42% [1] 10.42% [1] 10.42% [1]
Total first lien senior secured loans $ 60.2 [2],[3]   $ 60.2 [2],[3]   $ 60.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 60.2 [2],[3]   60.2 [2],[3]   58.8 [6],[7]                
Investment, Identifier [Axis]: American Residential Services L.L.C. and Aragorn Parent Holdings LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.5   4.5   4.5                
Less: funded commitments (1.0)   (1.0)   (0.9)                
Total unfunded commitments 3.5   3.5   3.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.5   $ 3.5   $ 3.6                
Investment, Identifier [Axis]: American Residential Services L.L.C. and Aragorn Parent Holdings LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1075.00%   1075.00%     1075.00% 1075.00% 1075.00% 1075.00%        
Total first lien senior secured loans [3] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 1.0   $ 1.0                    
Investment, Identifier [Axis]: American Residential Services L.L.C. and Aragorn Parent Holdings LP, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         7.14%         7.14% 7.14% 7.14% 7.14%
Total first lien senior secured loans [7]         $ 0.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 0.6                
Investment, Identifier [Axis]: American Residential Services L.L.C. and Aragorn Parent Holdings LP, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.25%         9.25% 9.25% 9.25% 9.25%
Total first lien senior secured loans [7]         $ 0.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 0.3                
Investment, Identifier [Axis]: American Residential Services L.L.C. and Aragorn Parent Holdings LP, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1415.00% [5]   1415.00% [5]   13.23% [1] 1415.00% [5] 1415.00% [5] 1415.00% [5] 1415.00% [5] 13.23% [1] 13.23% [1] 13.23% [1] 13.23% [1]
Total first lien senior secured loans $ 56.4 [2],[3]   $ 56.4 [2],[3]   $ 56.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 56.4 [2],[3]   56.4 [2],[3]   56.4 [6],[7]                
Investment, Identifier [Axis]: American Residential Services L.L.C. and Aragorn Parent Holdings LP, Series A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.9 [3]   5.9 [3]   6.5 [7]                
Investment, Identifier [Axis]: American Seafoods Group LLC and American Seafoods Partners LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [3]   0.2 [3]   0.3 [7]                
Investment, Identifier [Axis]: American Seafoods Group LLC and American Seafoods Partners LLC, Warrant to purchase Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 28.0                
Investment, Identifier [Axis]: American Seafoods Group LLC and American Seafoods Partners LLC, Warrant to purchase units of Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 21.2   $ 21.2                    
Investment, Identifier [Axis]: Amryt Pharmaceuticals, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.46%         10.46% 10.46% 10.46% 10.46%
Total first lien senior secured loans [6],[7],[8]         $ 12.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         $ 12.7                
Investment, Identifier [Axis]: Amynta Agency Borrower Inc. and Amynta Warranty Borrower Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1042.00%   1042.00%     1042.00% 1042.00% 1042.00% 1042.00%        
Total first lien senior secured loans [3],[10] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[10] 1.0   1.0                    
Investment, Identifier [Axis]: Amynta Agency Borrower Inc. and Amynta Warranty Borrower Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.58%         9.58% 9.58% 9.58% 9.58%
Total first lien senior secured loans [7]         $ 14.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 14.0                
Investment, Identifier [Axis]: Amynta Agency Borrower Inc. and Amynta Warranty Borrower Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.88%         8.88% 8.88% 8.88% 8.88%
Total first lien senior secured loans [7]         $ 2.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         2.2                
Investment, Identifier [Axis]: Anaplan, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.4   1.4   1.4                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 1.4   1.4   1.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.4   $ 1.4   $ 1.4                
Investment, Identifier [Axis]: Anaplan, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1182.00% [5]   1182.00% [5]   10.82% [1] 1182.00% [5] 1182.00% [5] 1182.00% [5] 1182.00% [5] 10.82% [1] 10.82% [1] 10.82% [1] 10.82% [1]
Total first lien senior secured loans $ 1.8 [2],[3]   $ 1.8 [2],[3]   $ 1.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.8 [2],[3]   1.8 [2],[3]   1.7 [6],[7]                
Investment, Identifier [Axis]: Anaqua Parent Holdings, Inc. & Astorg VII Co-Invest Anaqua                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.1   0.1   3.4                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.1   0.1   3.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.1   $ 0.1   $ 3.4                
Investment, Identifier [Axis]: Anaqua Parent Holdings, Inc. & Astorg VII Co-Invest Anaqua, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 890.00% [5]   890.00% [5]   7.52% [1] 890.00% [5] 890.00% [5] 890.00% [5] 890.00% [5] 7.52% [1] 7.52% [1] 7.52% [1] 7.52% [1]
Total first lien senior secured loans $ 4.3 [3]   $ 4.3 [3]   $ 4.4 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.3 [3]   $ 4.3 [3]   $ 4.4 [7]                
Investment, Identifier [Axis]: Anaqua Parent Holdings, Inc. & Astorg VII Co-Invest Anaqua, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1086.00% [5]   1086.00% [5]   9.11% [1] 1086.00% [5] 1086.00% [5] 1086.00% [5] 1086.00% [5] 9.11% [1] 9.11% [1] 9.11% [1] 9.11% [1]
Total first lien senior secured loans $ 2.3 [2],[3]   $ 2.3 [2],[3]   $ 1.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.3 [2],[3]   $ 2.3 [2],[3]   1.0 [6],[7]                
Investment, Identifier [Axis]: Anaqua Parent Holdings, Inc. & Astorg VII Co-Invest Anaqua, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1060.00%   1060.00%     1060.00% 1060.00% 1060.00% 1060.00%        
Total first lien senior secured loans [2],[3] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.1   0.1                    
Investment, Identifier [Axis]: Anaqua Parent Holdings, Inc. & Astorg VII Co-Invest Anaqua, Limited partnership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 8.9 [3],[4]   8.9 [3],[4]   8.3 [7],[8]                
Investment, Identifier [Axis]: Apex Clean Energy TopCo, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     33.1   18.1                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   53.4                
Fair Value 183.7   183.7   150.6                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.2   3.2                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 3.2   3.2                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 3.2   3.2                    
Investment, Identifier [Axis]: Apex Clean Energy TopCo, LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 183.7   $ 183.7   150.6                
Investment, Identifier [Axis]: Apex Service Partners, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1085.00%   1085.00%     1085.00% 1085.00% 1085.00% 1085.00%        
Total first lien senior secured loans [2],[3] $ 33.0   $ 33.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 32.2   $ 32.2                    
Investment, Identifier [Axis]: Apex Service Partners, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1081.00%   1081.00%     1081.00% 1081.00% 1081.00% 1081.00%        
Total first lien senior secured loans [2],[3] $ 28.1   $ 28.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 27.4   27.4                    
Investment, Identifier [Axis]: Applied Technical Services, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.0   5.0   3.8                
Less: funded commitments (1.5)   (1.5)   (1.1)                
Total unfunded commitments 3.5   3.5   2.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.5   $ 3.5   $ 2.7                
Investment, Identifier [Axis]: Applied Technical Services, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.48%         10.48% 10.48% 10.48% 10.48%
Total first lien senior secured loans [6],[7]         $ 0.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 0.8                
Investment, Identifier [Axis]: Applied Technical Services, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1154.00%   1154.00%     1154.00% 1154.00% 1154.00% 1154.00%        
Total first lien senior secured loans [2],[3] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.0   $ 1.0                    
Investment, Identifier [Axis]: Applied Technical Services, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1154.00%   1154.00%     1154.00% 1154.00% 1154.00% 1154.00%        
Total first lien senior secured loans [2],[3] $ 1.4   $ 1.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.4   $ 1.4                    
Investment, Identifier [Axis]: Applied Technical Services, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 13.50% [5]   13.50% [5]   12.25% [1] 13.50% [5] 13.50% [5] 13.50% [5] 13.50% [5] 12.25% [1] 12.25% [1] 12.25% [1] 12.25% [1]
Total first lien senior secured loans $ 1.5 [2],[3]   $ 1.5 [2],[3]   $ 1.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.5 [2],[3]   $ 1.5 [2],[3]   1.1 [6],[7]                
Investment, Identifier [Axis]: Appriss Health, LLC and Appriss Health Intermediate Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.1                
Less: funded commitments         0.0                
Total unfunded commitments         0.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.1                
Investment, Identifier [Axis]: Appriss Health, LLC and Appriss Health Intermediate Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1223.00% [5]   1223.00% [5]   11.54% [1] 1223.00% [5] 1223.00% [5] 1223.00% [5] 1223.00% [5] 11.54% [1] 11.54% [1] 11.54% [1] 11.54% [1]
Total first lien senior secured loans $ 5.6 [2],[3]   $ 5.6 [2],[3]   $ 5.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.6 [2],[3]   5.6 [2],[3]   5.7 [6],[7]                
Investment, Identifier [Axis]: Appriss Health, LLC and Appriss Health Intermediate Holdings, Inc., Series A preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 40.8 [3]   $ 40.8 [3]   35.6 [7]                
Investment, Identifier [Axis]: Apptio, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         4.2                
Less: funded commitments         (2.5)                
Total unfunded commitments         1.7                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 1.7                
Investment, Identifier [Axis]: Apptio, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.94%         9.94% 9.94% 9.94% 9.94%
Total first lien senior secured loans [6],[7]         $ 15.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 15.1                
Investment, Identifier [Axis]: Apptio, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.93%         9.93% 9.93% 9.93% 9.93%
Total first lien senior secured loans [6],[7]         $ 2.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 2.5                
Investment, Identifier [Axis]: Aptean, Inc. and Aptean Acquiror Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 967.00%   967.00%     967.00% 967.00% 967.00% 967.00%        
Total first lien senior secured loans [3],[10] $ 7.1   $ 7.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[10] 7.1   7.1                    
Investment, Identifier [Axis]: Ardonagh Midco 2 plc and Ardonagh Midco 3 plc                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 15.6   15.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 15.6   15.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 15.6   $ 15.6                    
Investment, Identifier [Axis]: Ardonagh Midco 2 plc and Ardonagh Midco 3 plc, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1251.00% [5]   1251.00% [5]   8.81% [1] 1251.00% [5] 1251.00% [5] 1251.00% [5] 1251.00% [5] 8.81% [1] 8.81% [1] 8.81% [1] 8.81% [1]
Total first lien senior secured loans $ 75.8 [2],[3],[4]   $ 75.8 [2],[3],[4]   $ 90.0 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 75.8 [2],[3],[4]   $ 75.8 [2],[3],[4]   $ 89.1 [6],[7],[8]                
Investment, Identifier [Axis]: Ardonagh Midco 2 plc and Ardonagh Midco 3 plc, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1095.00% [5]   1095.00% [5]   8.19% [1] 1095.00% [5] 1095.00% [5] 1095.00% [5] 1095.00% [5] 8.19% [1] 8.19% [1] 8.19% [1] 8.19% [1]
Total first lien senior secured loans $ 6.9 [2],[3],[4]   $ 6.9 [2],[3],[4]   $ 66.8 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.9 [2],[3],[4]   $ 6.9 [2],[3],[4]   $ 66.8 [6],[7],[8]                
Investment, Identifier [Axis]: Ardonagh Midco 2 plc and Ardonagh Midco 3 plc, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1114.00% [5]   1114.00% [5]   8.19% [1] 1114.00% [5] 1114.00% [5] 1114.00% [5] 1114.00% [5] 8.19% [1] 8.19% [1] 8.19% [1] 8.19% [1]
Total first lien senior secured loans $ 90.0 [2],[3],[4]   $ 90.0 [2],[3],[4]   $ 75.0 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 89.1 [2],[3],[4]   $ 89.1 [2],[3],[4]   $ 75.0 [6],[7],[8]                
Investment, Identifier [Axis]: Ardonagh Midco 2 plc and Ardonagh Midco 3 plc, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1257.00% [5]   1257.00% [5]   8.00% [1] 1257.00% [5] 1257.00% [5] 1257.00% [5] 1257.00% [5] 8.00% [1] 8.00% [1] 8.00% [1] 8.00% [1]
Total first lien senior secured loans $ 15.6 [2],[3],[4]   $ 15.6 [2],[3],[4]   $ 7.0 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 15.6 [2],[3],[4]   $ 15.6 [2],[3],[4]   7.0 [6],[7],[8]                
Investment, Identifier [Axis]: Ardonagh Midco 2 plc and Ardonagh Midco 3 plc, First lien senior secured loan 5                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1045.00%   1045.00%     1045.00% 1045.00% 1045.00% 1045.00%        
Total first lien senior secured loans [2],[3],[4] $ 66.1   $ 66.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 66.1   $ 66.1                    
Investment, Identifier [Axis]: Ardonagh Midco 2 plc and Ardonagh Midco 3 plc, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1150.00%   1150.00%     1150.00% 1150.00% 1150.00% 1150.00%        
Total first lien senior secured loans $ 1.4 [3],[4],[10]   $ 1.4 [3],[4],[10]   1.4 [7],[8],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.4 [3],[4],[10]   1.4 [3],[4],[10]   1.4 [7],[8],[11]                
Investment, Identifier [Axis]: Argenbright Holdings V, LLC and Amberstone Security Group Limited                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.5   2.5   2.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.5   2.5   2.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.5   $ 2.5   $ 2.5                
Investment, Identifier [Axis]: Argenbright Holdings V, LLC and Amberstone Security Group Limited, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1277.00% [5]   1277.00% [5]   11.49% [1] 1277.00% [5] 1277.00% [5] 1277.00% [5] 1277.00% [5] 11.49% [1] 11.49% [1] 11.49% [1] 11.49% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 20.9 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 20.7 [6],[7],[8]                
Investment, Identifier [Axis]: Argenbright Holdings V, LLC and Amberstone Security Group Limited, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1277.00% [5]   1277.00% [5]   11.53% [1] 1277.00% [5] 1277.00% [5] 1277.00% [5] 1277.00% [5] 11.53% [1] 11.53% [1] 11.53% [1] 11.53% [1]
Total first lien senior secured loans $ 6.0 [2],[3],[4]   $ 6.0 [2],[3],[4]   $ 5.9 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.9 [2],[3],[4]   5.9 [2],[3],[4]   5.8 [6],[7],[8]                
Investment, Identifier [Axis]: Arrowhead Holdco Company and Arrowhead GS Holdings, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.4 [3]   $ 0.4 [3]   $ 6.4 [7]                
Investment, Identifier [Axis]: Arrowhead Holdco Company and Arrowhead GS Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 982.00% [5]   982.00% [5]   8.68% [1] 982.00% [5] 982.00% [5] 982.00% [5] 982.00% [5] 8.68% [1] 8.68% [1] 8.68% [1] 8.68% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: AthenaHealth Group Inc., Minerva Holdco, Inc. and BCPE Co-Invest (A), LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.0   9.0   9.0                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 9.0   9.0   9.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 9.0   9.0   9.0                
Investment, Identifier [Axis]: AthenaHealth Group Inc., Minerva Holdco, Inc. and BCPE Co-Invest (A), LP 1                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.2   1.2                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.2   1.2                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 1.2   1.2                    
Investment, Identifier [Axis]: AthenaHealth Group Inc., Minerva Holdco, Inc. and BCPE Co-Invest (A), LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 12.7 [3]   $ 12.7 [3]   9.5 [7]                
Investment, Identifier [Axis]: AthenaHealth Group Inc., Minerva Holdco, Inc. and BCPE Co-Invest (A), LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 857.00%   857.00%     857.00% 857.00% 857.00% 857.00%        
Total first lien senior secured loans [2],[3],[10] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[10] 0.1   0.1                    
Investment, Identifier [Axis]: AthenaHealth Group Inc., Minerva Holdco, Inc. and BCPE Co-Invest (A), LP, Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 224.5 [3]   224.5 [3]   198.5 [7]                
Investment, Identifier [Axis]: Athyrium Buffalo LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.9   7.9   15.5                
Less: funded commitments 0.0   0.0   (7.6)                
Total unfunded commitments 7.9   7.9   7.9                
Less: commitments substantially at discretion of the Company 7.9   7.9   7.9                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0   0.0                
Investment, Identifier [Axis]: Athyrium Buffalo LP, Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[8]         7.5                
Investment, Identifier [Axis]: Athyrium Buffalo LP, Limited partnership interests 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[4] 7.4   7.4                    
Investment, Identifier [Axis]: Athyrium Buffalo LP, Limited partnership interests 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[4] 3.6   3.6                    
Investment, Identifier [Axis]: Atlas Intermediate III, L.L.C.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.8   0.8   0.8                
Less: funded commitments (0.5)   (0.5)   (0.2)                
Total unfunded commitments 0.3   0.3   0.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.3   $ 0.3   $ 0.6                
Investment, Identifier [Axis]: Atlas Intermediate III, L.L.C., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1127.00% [5]   1127.00% [5]   10.48% [1] 1127.00% [5] 1127.00% [5] 1127.00% [5] 1127.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Atlas Intermediate III, L.L.C., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1127.00% [5]   1127.00% [5]   10.48% [1] 1127.00% [5] 1127.00% [5] 1127.00% [5] 1127.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Atlas Intermediate III, L.L.C., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1127.00% [5]   1127.00% [5]   10.48% [1] 1127.00% [5] 1127.00% [5] 1127.00% [5] 1127.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Atlas Intermediate III, L.L.C., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1127.00% [5]   1127.00% [5]   10.48% [1] 1127.00% [5] 1127.00% [5] 1127.00% [5] 1127.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.2 [6],[7]                
Investment, Identifier [Axis]: Atlas Intermediate III, L.L.C., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1117.00% [5]   1117.00% [5]   10.10% [1] 1117.00% [5] 1117.00% [5] 1117.00% [5] 1117.00% [5] 10.10% [1] 10.10% [1] 10.10% [1] 10.10% [1]
Total first lien senior secured loans $ 0.5 [2],[3]   $ 0.5 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.5 [2],[3]   $ 0.5 [2],[3]   0.2 [6],[7]                
Investment, Identifier [Axis]: Auctane, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1117.00%   1117.00%     1117.00% 1117.00% 1117.00% 1117.00%        
Total first lien senior secured loans [2],[3] $ 145.7   $ 145.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 139.8   139.8                    
Investment, Identifier [Axis]: Automotive Keys Group, LLC and Automotive Keys Investor, LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   $ 0.0                
Investment, Identifier [Axis]: Automotive Keys Group, LLC and Automotive Keys Investor, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.93% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.93% [1] 10.93% [1] 10.93% [1] 10.93% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 5.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 5.3 [6],[7]                
Investment, Identifier [Axis]: Automotive Keys Group, LLC and Automotive Keys Investor, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   9.73% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 9.73% [1] 9.73% [1] 9.73% [1] 9.73% [1]
Total first lien senior secured loans $ 5.1 [2],[3]   $ 5.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.0 [2],[3]   5.0 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Automotive Keys Group, LLC and Automotive Keys Investor, LLC, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         5.2                
Investment, Identifier [Axis]: Automotive Keys Group, LLC and Automotive Keys Investor, LLC, Preferred units 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 3.1   3.1                    
Investment, Identifier [Axis]: Automotive Keys Group, LLC and Automotive Keys Investor, LLC, Preferred units 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.8   0.8                    
Investment, Identifier [Axis]: Avalara, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.7   2.7   2.7                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.7   2.7   2.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.7   $ 2.7   $ 2.7                
Investment, Identifier [Axis]: Avalara, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1264.00% [5]   1264.00% [5]   11.83% [1] 1264.00% [5] 1264.00% [5] 1264.00% [5] 1264.00% [5] 11.83% [1] 11.83% [1] 11.83% [1] 11.83% [1]
Total first lien senior secured loans $ 72.2 [2],[3]   $ 72.2 [2],[3]   $ 72.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 72.2 [2],[3]   $ 72.2 [2],[3]   70.4 [6],[7]                
Investment, Identifier [Axis]: Aventine Intermediate LLC & Aventine Holdings II LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.2                
Less: funded commitments         0.0                
Total unfunded commitments         0.2                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.2                
Investment, Identifier [Axis]: Aventine Intermediate LLC & Aventine Holdings II LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 11.49% [5]   11.49% [5]   10.38% [1] 11.49% [5] 11.49% [5] 11.49% [5] 11.49% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 9.9 [2],[3]   $ 9.9 [2],[3]   $ 9.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 9.5 [2],[3]   9.5 [2],[3]   9.3 [6],[7]                
Investment, Identifier [Axis]: Aventine Intermediate LLC & Aventine Holdings II LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 41.4 [3]   41.4 [3]   39.4 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 33.9 [3]   $ 33.9 [3]   $ 36.2 [7]                
Investment, Identifier [Axis]: Aventiv Technologies, LLC and Securus Technologies Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1023.00% [5]   1023.00% [5]   9.23% [1] 1023.00% [5] 1023.00% [5] 1023.00% [5] 1023.00% [5] 9.23% [1] 9.23% [1] 9.23% [1] 9.23% [1]
Total first lien senior secured loans $ 9.1 [2],[3],[10]   $ 9.1 [2],[3],[10]   $ 9.1 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.1 [2],[3],[10]   $ 8.1 [2],[3],[10]   $ 6.8 [6],[7],[11]                
Investment, Identifier [Axis]: Aventiv Technologies, LLC and Securus Technologies Holdings, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1398.00% [5]   1398.00% [5]   12.66% [1] 1398.00% [5] 1398.00% [5] 1398.00% [5] 1398.00% [5] 12.66% [1] 12.66% [1] 12.66% [1] 12.66% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [2],[3]   0.2 [2],[3]   0.2 [6],[7]                
Investment, Identifier [Axis]: Avetta, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.2   4.2   4.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.2   4.2   4.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.2   $ 4.2   $ 4.2                
Investment, Identifier [Axis]: Avetta, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1072.00% [5]   1072.00% [5]   10.16% [1] 1072.00% [5] 1072.00% [5] 1072.00% [5] 1072.00% [5] 10.16% [1] 10.16% [1] 10.16% [1] 10.16% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: AxiomSL Group, Inc. and Calypso Group, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.5   2.5   3.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.5   2.5   3.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.5   $ 2.5   $ 3.9                
Investment, Identifier [Axis]: AxiomSL Group, Inc. and Calypso Group, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1118.00% [5]   1118.00% [5]   10.13% [1] 1118.00% [5] 1118.00% [5] 1118.00% [5] 1118.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 21.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   21.2 [6],[7]                
Investment, Identifier [Axis]: Axiomatic, LLC, Class A-1 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.6   $ 5.6   5.3                
Investment, Identifier [Axis]: BAART Programs, Inc., MedMark Services, Inc., and Canadian Addiction Treatment Centres LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         2.0                
Less: funded commitments         0.0                
Total unfunded commitments         2.0                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 2.0                
Investment, Identifier [Axis]: BAART Programs, Inc., MedMark Services, Inc., and Canadian Addiction Treatment Centres LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1065.00% [5]   1065.00% [5]   9.73% [1] 1065.00% [5] 1065.00% [5] 1065.00% [5] 1065.00% [5] 9.73% [1] 9.73% [1] 9.73% [1] 9.73% [1]
Total first lien senior secured loans $ 6.0 [2],[3]   $ 6.0 [2],[3]   $ 6.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.8 [2],[3]   5.8 [2],[3]   5.9 [6],[7]                
Investment, Identifier [Axis]: BAMBOO US BIDCO LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 23.8   23.8                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 23.8   23.8                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 23.8   23.8                    
Investment, Identifier [Axis]: BCC Blueprint Holdings I, LLC and BCC Blueprint Investments, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.4 [3]   $ 4.4 [3]   $ 3.9 [7]                
Investment, Identifier [Axis]: BCC Blueprint Holdings I, LLC and BCC Blueprint Investments, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1231.00% [5]   1231.00% [5]   11.02% [1] 1231.00% [5] 1231.00% [5] 1231.00% [5] 1231.00% [5] 11.02% [1] 11.02% [1] 11.02% [1] 11.02% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [2],[3]   0.2 [2],[3]   0.2 [6],[7]                
Investment, Identifier [Axis]: BCC Blueprint Holdings I, LLC and BCC Blueprint Investments, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 5.4 [3]   5.4 [3]   5.0 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.4 [3]   5.4 [3]   4.9 [7]                
Investment, Identifier [Axis]: BCTO Ignition Purchaser, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [2],[3],[4] 3.4   3.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 3.3   3.3                    
Investment, Identifier [Axis]: BH-Sharp Holdings LP, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.6 [3]   $ 2.6 [3]   $ 2.3 [7]                
Investment, Identifier [Axis]: Badger Sportswear Acquisition, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         13.57%         13.57% 13.57% 13.57% 13.57%
Total first lien senior secured loans [6],[7]         $ 56.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         56.8                
Investment, Identifier [Axis]: Badger Sportswear Acquisition, LLC, Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1457.00%   1457.00%     1457.00% 1457.00% 1457.00% 1457.00%        
Total first lien senior secured loans [2],[3] $ 28.4   $ 28.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 27.8   $ 27.8                    
Investment, Identifier [Axis]: Badger Sportswear Acquisition, LLC, Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1527.00%   1527.00%     1527.00% 1527.00% 1527.00% 1527.00%        
Total first lien senior secured loans [2],[3] $ 28.4   $ 28.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 27.8   27.8                    
Investment, Identifier [Axis]: Balrog Acquisition, Inc., Balrog Topco, Inc. and Balrog Parent, L.P., Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 13.9 [3]   $ 13.9 [3]   $ 10.5 [7]                
Investment, Identifier [Axis]: Balrog Acquisition, Inc., Balrog Topco, Inc. and Balrog Parent, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 993.00%   993.00%     993.00% 993.00% 993.00% 993.00%        
Total first lien senior secured loans [2],[3] $ 16.5   $ 16.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 16.5   $ 16.5                    
Investment, Identifier [Axis]: Balrog Acquisition, Inc., Balrog Topco, Inc. and Balrog Parent, L.P., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1243.00% [5]   1243.00% [5]   11.73% [1] 1243.00% [5] 1243.00% [5] 1243.00% [5] 1243.00% [5] 11.73% [1] 11.73% [1] 11.73% [1] 11.73% [1]
Total first lien senior secured loans $ 29.5 [2],[3]   $ 29.5 [2],[3]   $ 29.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 29.5 [2],[3]   29.5 [2],[3]   29.5 [6],[7]                
Investment, Identifier [Axis]: Balrog Acquisition, Inc., Balrog Topco, Inc. and Balrog Parent, L.P., Series A preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 27.5 [3]   27.5 [3]   25.4 [7]                
Investment, Identifier [Axis]: Bambino Group Holdings, LLC, Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.9 [3]   $ 0.9 [3]   $ 0.9 [7]                
Investment, Identifier [Axis]: Bamboo Purchaser, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   10.73% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 17.8 [2],[3]   $ 17.8 [2],[3]   $ 17.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 17.3 [2],[3]   $ 17.3 [2],[3]   17.4 [6],[7]                
Investment, Identifier [Axis]: Bamboo US BidCo LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 986.00%   986.00%     986.00% 986.00% 986.00% 986.00%        
Total first lien senior secured loans [2],[3] $ 43.7   $ 43.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 42.4   $ 42.4                    
Investment, Identifier [Axis]: Bamboo US BidCo LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1132.00%   1132.00%     1132.00% 1132.00% 1132.00% 1132.00%        
Total first lien senior secured loans [2],[3] $ 62.0   $ 62.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 60.2   60.2                    
Investment, Identifier [Axis]: Banyan Software Holdings, LLC and Banyan Software, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.6   12.6   8.0                
Less: funded commitments (1.0)   (1.0)   (0.9)                
Total unfunded commitments 11.6   11.6   7.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 11.6   $ 11.6   $ 7.1                
Investment, Identifier [Axis]: Banyan Software Holdings, LLC and Banyan Software, LP, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1242.00% [5]   1242.00% [5]   11.23% [1] 1242.00% [5] 1242.00% [5] 1242.00% [5] 1242.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 1.0 [2],[3],[4]   $ 1.0 [2],[3],[4]   $ 20.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.0 [2],[3],[4]   $ 1.0 [2],[3],[4]   $ 20.3 [6],[7]                
Investment, Identifier [Axis]: Banyan Software Holdings, LLC and Banyan Software, LP, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1242.00% [5]   1242.00% [5]   11.23% [1] 1242.00% [5] 1242.00% [5] 1242.00% [5] 1242.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 0.2 [2],[3],[4]   $ 0.2 [2],[3],[4]   $ 1.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3],[4]   $ 0.2 [2],[3],[4]   $ 1.0 [6],[7]                
Investment, Identifier [Axis]: Banyan Software Holdings, LLC and Banyan Software, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   10.88% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 10.88% [1] 10.88% [1] 10.88% [1] 10.88% [1]
Total first lien senior secured loans $ 1.0 [2],[3],[4]   $ 1.0 [2],[3],[4]   $ 0.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.0 [2],[3],[4]   1.0 [2],[3],[4]   0.9 [6],[7]                
Investment, Identifier [Axis]: Banyan Software Holdings, LLC and Banyan Software, LP, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 8.3 [3],[4]   8.3 [3],[4]   5.4 [7]                
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.0   5.0   5.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 5.0   5.0   5.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.0   $ 5.0   $ 5.5                
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.39%         9.39% 9.39% 9.39% 9.39%
Total first lien senior secured loans [6],[7],[8]         $ 17.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         17.7                
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1107.00%   1107.00%     1107.00% 1107.00% 1107.00% 1107.00%        
Total first lien senior secured loans [2],[3],[4] $ 19.9   $ 19.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 19.9   $ 19.9                    
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1107.00%   1107.00%     1107.00% 1107.00% 1107.00% 1107.00%        
Total first lien senior secured loans [2],[3],[4] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 1.0   1.0                    
Investment, Identifier [Axis]: Beacon Wellness Brands, Inc. and CDI Holdings I Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.9   0.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.9   0.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 0.9   0.9                    
Investment, Identifier [Axis]: Beacon Wellness Brands, Inc. and CDI Holdings I Corp., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 4.6   $ 4.6                    
Investment, Identifier [Axis]: Beacon Wellness Brands, Inc. and CDI Holdings I Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1117.00%   1117.00%     1117.00% 1117.00% 1117.00% 1117.00%        
Total first lien senior secured loans [2],[3] $ 3.7   $ 3.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 3.6   3.6                    
Investment, Identifier [Axis]: Belfor Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 25.0   25.0   25.0                
Less: funded commitments (8.8)   (8.8)   (17.0)                
Total unfunded commitments 16.2   16.2   8.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 16.2   $ 16.2   $ 8.0                
Investment, Identifier [Axis]: Belfor Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 749.00%   749.00%     749.00% 749.00% 749.00% 749.00%        
Total first lien senior secured loans [3],[13] $ 2.6   $ 2.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[13] 2.5   2.5                    
Investment, Identifier [Axis]: Belfor Holdings, Inc., First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         7.25%         7.25% 7.25% 7.25% 7.25%
Total first lien senior secured loans [7],[14]         $ 11.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[14]         $ 12.1                
Investment, Identifier [Axis]: Belfor Holdings, Inc., First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.25%         10.25% 10.25% 10.25% 10.25%
Total first lien senior secured loans [7],[14]         $ 1.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[14]         1.4                
Investment, Identifier [Axis]: Benecon Midco II LLC and Locutus Holdco LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.5   4.5   4.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.5   4.5   4.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 4.5   4.5   4.5                
Investment, Identifier [Axis]: Benecon Midco II LLC and Locutus Holdco LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 31.0   31.0   22.1                
Investment, Identifier [Axis]: Benefytt Technologies, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.9                
Less: funded commitments         0.0                
Total unfunded commitments         0.9                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.9                
Investment, Identifier [Axis]: Benefytt Technologies, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         13.16%         13.16% 13.16% 13.16% 13.16%
Total first lien senior secured loans [6],[7]         $ 29.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         23.9                
Investment, Identifier [Axis]: Berner Food & Beverage, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.7   1.7   1.7                
Less: funded commitments (1.0)   (1.0)   (0.5)                
Total unfunded commitments 0.7   0.7   1.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.7   $ 0.7   $ 1.2                
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1300.00% [5]   1300.00% [5]   12.00% [1] 1300.00% [5] 1300.00% [5] 1300.00% [5] 1300.00% [5] 12.00% [1] 12.00% [1] 12.00% [1] 12.00% [1]
Total first lien senior secured loans $ 0.7 [2],[3]   $ 0.7 [2],[3]   $ 0.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.7 [2],[3]   $ 0.7 [2],[3]   $ 0.4 [6],[7]                
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1102.00% [5]   1102.00% [5]   9.91% [1] 1102.00% [5] 1102.00% [5] 1102.00% [5] 1102.00% [5] 9.91% [1] 9.91% [1] 9.91% [1] 9.91% [1]
Total first lien senior secured loans $ 0.3 [2],[3]   $ 0.3 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.3 [2],[3]   0.3 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Blue Wolf Capital Fund II, L.P.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   (0.2)                
Fair Value 0.1   0.1   0.1                
Investment, Identifier [Axis]: Blue Wolf Capital Fund II, L.P., Limited partnership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [4],[10]   0.1 [4],[10]   0.1 [8],[11]                
Investment, Identifier [Axis]: BlueHalo Financing Holdings, LLC, BlueHalo Global Holdings, LLC, and BlueHalo, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.0   3.0   3.0                
Less: funded commitments (1.0)   (1.0)   (2.8)                
Total unfunded commitments 2.0   2.0   0.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.0   $ 2.0   $ 0.2                
Investment, Identifier [Axis]: BlueHalo Financing Holdings, LLC, BlueHalo Global Holdings, LLC, and BlueHalo, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   10.70% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 10.70% [1] 10.70% [1] 10.70% [1] 10.70% [1]
Total first lien senior secured loans $ 1.0 [2],[3]   $ 1.0 [2],[3]   $ 1.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.0 [2],[3]   $ 1.0 [2],[3]   $ 1.0 [6],[7]                
Investment, Identifier [Axis]: BlueHalo Financing Holdings, LLC, BlueHalo Global Holdings, LLC, and BlueHalo, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   10.72% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 10.72% [1] 10.72% [1] 10.72% [1] 10.72% [1]
Total first lien senior secured loans $ 0.9 [2],[3]   $ 0.9 [2],[3]   $ 2.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.9 [2],[3]   0.9 [2],[3]   2.7 [6],[7]                
Investment, Identifier [Axis]: Bobcat Purchaser, LLC and Bobcat Topco, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.5   6.5                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 6.5   6.5                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 6.5   6.5                    
Investment, Identifier [Axis]: Bobcat Purchaser, LLC and Bobcat Topco, L.P., Class A-1 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.5   $ 1.5                    
Investment, Identifier [Axis]: Bobcat Purchaser, LLC and Bobcat Topco, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1164.00%   1164.00%     1164.00% 1164.00% 1164.00% 1164.00%        
Total first lien senior secured loans [2],[3] $ 11.8   $ 11.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 11.5   11.5                    
Investment, Identifier [Axis]: Borrower R365 Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.3   2.3   2.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.3   2.3   2.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.3   $ 2.3   $ 2.9                
Investment, Identifier [Axis]: Borrower R365 Holdings LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   8.23% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 8.23% [1] 8.23% [1] 8.23% [1] 8.23% [1]
Total first lien senior secured loans $ 16.1 [2],[3]   $ 16.1 [2],[3]   $ 15.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 16.1 [2],[3]   $ 16.1 [2],[3]   $ 15.9 [6],[7]                
Investment, Identifier [Axis]: Borrower R365 Holdings LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1201.00% [5]   1201.00% [5]   8.23% [1] 1201.00% [5] 1201.00% [5] 1201.00% [5] 1201.00% [5] 8.23% [1] 8.23% [1] 8.23% [1] 8.23% [1]
Total first lien senior secured loans $ 2.0 [2],[3]   $ 2.0 [2],[3]   $ 1.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.0 [2],[3]   2.0 [2],[3]   1.4 [6],[7]                
Investment, Identifier [Axis]: Bottomline Technologies, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         2.3                
Less: funded commitments         0.0                
Total unfunded commitments         2.3                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 2.3                
Investment, Identifier [Axis]: Bottomline Technologies, Inc. and Legal Spend Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.3   2.3                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 2.3   2.3                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.3   $ 2.3                    
Investment, Identifier [Axis]: Bottomline Technologies, Inc. and Legal Spend Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1057.00%   1057.00%     1057.00% 1057.00% 1057.00% 1057.00%        
Total first lien senior secured loans [2],[3] $ 17.9   $ 17.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 17.9   17.9                    
Investment, Identifier [Axis]: Bottomline Technologies, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.82%         9.82% 9.82% 9.82% 9.82%
Total first lien senior secured loans [6],[7]         $ 18.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         17.6                
Investment, Identifier [Axis]: Bowhunter Holdings, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: Bragg Live Food Products, LLC and SPC Investment Co., L.P.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     1.5   3.3                
Redemptions (cost)     3.4   5.7                
Sales (cost)     0.0   9.8                
Interest income     2.6   3.4                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.2                
Net realized gains (losses):     0.0   (0.2)                
Net unrealized gains (losses):     4.6   3.5                
Fair Value 41.8   41.8   39.1                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.4   4.4   4.4                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.4   4.4   4.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 4.4   4.4   4.4                
Investment, Identifier [Axis]: Bragg Live Food Products, LLC and SPC Investment Co., L.P., Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 14.7 [3]   $ 14.7 [3]   $ 10.8 [7]                
Investment, Identifier [Axis]: Bragg Live Food Products, LLC and SPC Investment Co., L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1249.00% [5]   1249.00% [5]   11.58% [1] 1249.00% [5] 1249.00% [5] 1249.00% [5] 1249.00% [5] 11.58% [1] 11.58% [1] 11.58% [1] 11.58% [1]
Total first lien senior secured loans $ 27.1 [2],[3]   $ 27.1 [2],[3]   $ 28.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 27.1 [2],[3]   $ 27.1 [2],[3]   $ 28.3 [6],[7]                
Investment, Identifier [Axis]: Burgess Point Purchaser Corporation, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1067.00% [5]   1067.00% [5]   9.67% [1] 1067.00% [5] 1067.00% [5] 1067.00% [5] 1067.00% [5] 9.67% [1] 9.67% [1] 9.67% [1] 9.67% [1]
Total first lien senior secured loans $ 22.1 [2],[3],[10]   $ 22.1 [2],[3],[10]   $ 4.8 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 20.8 [2],[3],[10]   20.8 [2],[3],[10]   4.3 [6],[7],[11]                
Investment, Identifier [Axis]: Businessolver.com, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.6   3.6   3.6                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.6   3.6   3.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.6   $ 3.6   $ 3.6                
Investment, Identifier [Axis]: Businessolver.com, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1099.00% [5]   1099.00% [5]   9.67% [1] 1099.00% [5] 1099.00% [5] 1099.00% [5] 1099.00% [5] 9.67% [1] 9.67% [1] 9.67% [1] 9.67% [1]
Total first lien senior secured loans $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 14.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.4 [2],[3]   0.4 [2],[3]   14.5 [6],[7]                
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         12.0                
Less: funded commitments         (3.7)                
Total unfunded commitments         8.3                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 8.3                
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.91%         9.91% 9.91% 9.91% 9.91%
Total first lien senior secured loans [7],[11]         $ 33.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[11]         26.2                
Investment, Identifier [Axis]: CCS-CMGC Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [15]         0.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [15]         0.0                
Investment, Identifier [Axis]: CDI Holdings III Corp. and CDI Holdings I Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.9                
Less: funded commitments         0.0                
Total unfunded commitments         0.9                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         0.9                
Investment, Identifier [Axis]: CDI Holdings III Corp. and CDI Holdings I Corp., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 4.4                
Investment, Identifier [Axis]: CDI Holdings III Corp. and CDI Holdings I Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.13%         10.13% 10.13% 10.13% 10.13%
Total first lien senior secured loans [6],[7]         $ 3.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         3.6                
Investment, Identifier [Axis]: CFC Funding LLC., Loan instrument units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [4] 16.2   16.2                    
Investment, Identifier [Axis]: CHG PPC Parent LLC & PPC CHG Blocker LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.6 [3]   $ 3.6 [3]   $ 2.9 [7]                
Investment, Identifier [Axis]: CHG PPC Parent LLC & PPC CHG Blocker LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1218.00% [5]   1218.00% [5]   11.13% [1] 1218.00% [5] 1218.00% [5] 1218.00% [5] 1218.00% [5] 11.13% [1] 11.13% [1] 11.13% [1] 11.13% [1]
Total first lien senior secured loans $ 94.6 [2],[3]   $ 94.6 [2],[3]   $ 94.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 93.7 [2],[3]   93.7 [2],[3]   89.9 [6],[7]                
Investment, Identifier [Axis]: CMG HoldCo, LLC and CMG Buyer Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.2   10.2   10.2                
Less: funded commitments (0.5)   (0.5)   (0.4)                
Total unfunded commitments 9.7   9.7   9.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 9.7   9.7   9.8                
Investment, Identifier [Axis]: CMG HoldCo, LLC and CMG Buyer Holdings, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.9 [3]   $ 6.9 [3]   $ 4.6 [7],[16]                
Investment, Identifier [Axis]: CMG HoldCo, LLC and CMG Buyer Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1038.00%   1038.00%     1038.00% 1038.00% 1038.00% 1038.00%        
Total first lien senior secured loans [2],[3] $ 25.4   $ 25.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 25.4   $ 25.4                    
Investment, Identifier [Axis]: CMG HoldCo, LLC and CMG Buyer Holdings, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.52%         9.52% 9.52% 9.52% 9.52%
Total first lien senior secured loans [6],[7],[16]         $ 21.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         $ 21.4                
Investment, Identifier [Axis]: CMG HoldCo, LLC and CMG Buyer Holdings, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.40%         9.40% 9.40% 9.40% 9.40%
Total first lien senior secured loans [6],[7],[16]         $ 3.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         $ 3.7                
Investment, Identifier [Axis]: CMG HoldCo, LLC and CMG Buyer Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.47%         9.47% 9.47% 9.47% 9.47%
Total first lien senior secured loans [6],[7]         $ 0.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.4                
Investment, Identifier [Axis]: CMG HoldCo, LLC and CMG Buyer Holdings, Inc., First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon [5] 1039.00%   1039.00%     1039.00% 1039.00% 1039.00% 1039.00%        
Total first lien senior secured loans [2],[3] $ 0.5   $ 0.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.5   $ 0.5                    
Investment, Identifier [Axis]: CMG HoldCo, LLC and CMG Buyer Holdings, Inc., First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon [5] 1250.00%   1250.00%     1250.00% 1250.00% 1250.00% 1250.00%        
Total first lien senior secured loans [2] $ 3.7   $ 3.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2] 3.7   3.7                    
Investment, Identifier [Axis]: CMW Parent LLC (fka Black Arrow, Inc.), Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0   $ 0.0   0.0                
Investment, Identifier [Axis]: CPIG Holdco Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1235.00%   1235.00%     1235.00% 1235.00% 1235.00% 1235.00%        
Total first lien senior secured loans [2],[3] $ 14.7   $ 14.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 14.3   14.3                    
Investment, Identifier [Axis]: CREST Exeter Street Solar 2004-1, Preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [4]   0.0 [4]   0.0 [8]                
Investment, Identifier [Axis]: CST Holding Company                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.9   1.9   1.9                
Less: funded commitments 0.0   0.0   (0.2)                
Total unfunded commitments 1.9   1.9   1.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.9   $ 1.9   $ 1.7                
Investment, Identifier [Axis]: CST Holding Company, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1192.00% [5]   1192.00% [5]   10.97% [1] 1192.00% [5] 1192.00% [5] 1192.00% [5] 1192.00% [5] 10.97% [1] 10.97% [1] 10.97% [1] 10.97% [1]
Total first lien senior secured loans $ 11.7 [2],[3]   $ 11.7 [2],[3]   $ 11.8 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.7 [2],[3]   11.7 [2],[3]   $ 11.4 [6],[7],[16]                
Investment, Identifier [Axis]: CST Holding Company, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.97%         10.97% 10.97% 10.97% 10.97%
Total first lien senior secured loans [6],[7],[16]         $ 0.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         0.2                
Investment, Identifier [Axis]: CVP Holdco, Inc. and OMERS Wildcats Investment Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 20.1   20.1   25.8                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 20.1   20.1   25.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 20.1   20.1   25.8                
Investment, Identifier [Axis]: CVP Holdco, Inc. and OMERS Wildcats Investment Holdings LLC, Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.8   0.8                    
Investment, Identifier [Axis]: CVP Holdco, Inc. and OMERS Wildcats Investment Holdings LLC, Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 22.7 [3]   $ 22.7 [3]   $ 22.7 [7]                
Investment, Identifier [Axis]: CVP Holdco, Inc. and OMERS Wildcats Investment Holdings LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1182.00% [5]   1182.00% [5]   11.13% [1] 1182.00% [5] 1182.00% [5] 1182.00% [5] 1182.00% [5] 11.13% [1] 11.13% [1] 11.13% [1] 11.13% [1]
Total first lien senior secured loans $ 38.6 [2],[3]   $ 38.6 [2],[3]   $ 49.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 38.6 [2],[3]   $ 38.6 [2],[3]   $ 49.0 [6],[7]                
Investment, Identifier [Axis]: CVP Holdco, Inc. and OMERS Wildcats Investment Holdings LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1182.00% [5]   1182.00% [5]   11.13% [1] 1182.00% [5] 1182.00% [5] 1182.00% [5] 1182.00% [5] 11.13% [1] 11.13% [1] 11.13% [1] 11.13% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 38.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 38.5 [6],[7]                
Investment, Identifier [Axis]: CVP Holdco, Inc. and OMERS Wildcats Investment Holdings LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1182.00% [5]   1182.00% [5]   10.98% [1] 1182.00% [5] 1182.00% [5] 1182.00% [5] 1182.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 40.2 [2],[3]   $ 40.2 [2],[3]   $ 1.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 40.2 [2],[3]   $ 40.2 [2],[3]   $ 1.6 [6],[7]                
Investment, Identifier [Axis]: CVP Holdco, Inc. and OMERS Wildcats Investment Holdings LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1217.00% [5]   1217.00% [5]   11.13% [1] 1217.00% [5] 1217.00% [5] 1217.00% [5] 1217.00% [5] 11.13% [1] 11.13% [1] 11.13% [1] 11.13% [1]
Total first lien senior secured loans $ 7.4 [2],[3]   $ 7.4 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 7.4 [2],[3]   7.4 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Cadence Aerospace, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.9   7.9   15.3                
Less: funded commitments (0.1)   (0.1)   (14.8)                
Total unfunded commitments 7.8   7.8   0.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 7.8   $ 7.8   $ 0.5                
Investment, Identifier [Axis]: Cadence Aerospace, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon 12.07% [5]   12.07% [5]   12.92% [1] 12.07% [5] 12.07% [5] 12.07% [5] 12.07% [5] 12.92% [1] 12.92% [1] 12.92% [1] 12.92% [1]
Total first lien senior secured loans $ 10.9 [2],[3]   $ 10.9 [2],[3]   $ 31.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.9 [2],[3]   $ 10.9 [2],[3]   $ 30.5 [6],[7]                
Investment, Identifier [Axis]: Cadence Aerospace, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon 12.07% [5]   12.07% [5]   12.92% [1] 12.07% [5] 12.07% [5] 12.07% [5] 12.07% [5] 12.92% [1] 12.92% [1] 12.92% [1] 12.92% [1]
Total first lien senior secured loans $ 3.4 [2],[3]   $ 3.4 [2],[3]   $ 11.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.4 [2],[3]   $ 3.4 [2],[3]   $ 11.6 [6],[7]                
Investment, Identifier [Axis]: Cadence Aerospace, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon 12.07% [5]   12.07% [5]   12.92% [1] 12.07% [5] 12.07% [5] 12.07% [5] 12.07% [5] 12.92% [1] 12.92% [1] 12.92% [1] 12.92% [1]
Total first lien senior secured loans $ 4.1 [2],[3]   $ 4.1 [2],[3]   $ 9.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.1 [2],[3]   $ 4.1 [2],[3]   $ 9.5 [6],[7]                
Investment, Identifier [Axis]: Cadence Aerospace, LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon 12.07% [5]   12.07% [5]   13.23% [1] 12.07% [5] 12.07% [5] 12.07% [5] 12.07% [5] 13.23% [1] 13.23% [1] 13.23% [1] 13.23% [1]
Total first lien senior secured loans $ 2.7 [2],[3]   $ 2.7 [2],[3]   $ 7.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.7 [2],[3]   $ 2.7 [2],[3]   $ 7.6 [6],[7]                
Investment, Identifier [Axis]: Cadence Aerospace, LLC, First lien senior secured loan 5                          
Schedule of Investments [Line Items]                          
Coupon 12.07% [5]   12.07% [5]   12.92% [1] 12.07% [5] 12.07% [5] 12.07% [5] 12.07% [5] 12.92% [1] 12.92% [1] 12.92% [1] 12.92% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 5.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   $ 5.2 [6],[7]                
Investment, Identifier [Axis]: Cadence Aerospace, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [17] 0.0   0.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [17] 0.0   0.0                    
Investment, Identifier [Axis]: Cadence Aerospace, LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon [1]         12.92%         12.92% 12.92% 12.92% 12.92%
Total first lien senior secured loans [6],[7],[14]         $ 13.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[14]         $ 13.4                
Investment, Identifier [Axis]: Cadence Aerospace, LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon [1]         12.92%         12.92% 12.92% 12.92% 12.92%
Total first lien senior secured loans [6],[7],[14]         $ 1.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[14]         1.0                
Investment, Identifier [Axis]: Caerus Midco 3 S.à r.l.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         4.1                
Less: funded commitments         0.0                
Total unfunded commitments         4.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 4.1                
Investment, Identifier [Axis]: Caerus Midco 3 S.à r.l.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.3   2.3                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 2.3   2.3                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.3   $ 2.3                    
Investment, Identifier [Axis]: Caerus Midco 3 S.à r.l., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1116.00% [5]   1116.00% [5]   9.83% [1] 1116.00% [5] 1116.00% [5] 1116.00% [5] 1116.00% [5] 9.83% [1] 9.83% [1] 9.83% [1] 9.83% [1]
Total first lien senior secured loans $ 7.2 [2],[3],[4]   $ 7.2 [2],[3],[4]   $ 5.4 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 7.1 [2],[3],[4]   7.1 [2],[3],[4]   5.3 [6],[7],[8]                
Investment, Identifier [Axis]: CallMiner, Inc., Warrant to purchase shares of Series 1 preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0   $ 0.0   $ 0.0                
Investment, Identifier [Axis]: Calyx Energy III, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.37%         12.37% 12.37% 12.37% 12.37%
Total first lien senior secured loans [6],[7]         $ 57.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         57.0                
Investment, Identifier [Axis]: Calyx Energy III, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1343.00%   1343.00%     1343.00% 1343.00% 1343.00% 1343.00%        
Total first lien senior secured loans [2],[3] $ 46.9   $ 46.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 46.9   $ 46.9                    
Investment, Identifier [Axis]: Calyx Energy III, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1643.00%   1643.00%     1643.00% 1643.00% 1643.00% 1643.00%        
Total first lien senior secured loans [2],[3] $ 5.0   $ 5.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 5.0   $ 5.0                    
Investment, Identifier [Axis]: Calyx Energy III, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1643.00%   1643.00%     1643.00% 1643.00% 1643.00% 1643.00%        
Total first lien senior secured loans [2],[3] $ 10.1   $ 10.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 10.1   10.1                    
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. and Capstone Parent Holdings, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 15.2   15.2   15.3                
Less: funded commitments (7.6)   (7.6)   (8.8)                
Total unfunded commitments 7.6   7.6   6.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 7.6   7.6   6.5                
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. and Capstone Parent Holdings, LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 18.2 [3]   $ 18.2 [3]   $ 20.1 [7]                
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. and Capstone Parent Holdings, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1017.00% [5]   1017.00% [5]   9.13% [1] 1017.00% [5] 1017.00% [5] 1017.00% [5] 1017.00% [5] 9.13% [1] 9.13% [1] 9.13% [1] 9.13% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [2],[3]   0.2 [2],[3]   0.2 [6],[7]                
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. and Capstone Parent Holdings, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [17]   0.0 [17]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [17]   $ 0.0 [17]   $ 0.0 [15]                
Investment, Identifier [Axis]: Capstone Acquisition Holdings, Inc. and Capstone Parent Holdings, LP, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1417.00% [5]   1417.00% [5]   13.13% [1] 1417.00% [5] 1417.00% [5] 1417.00% [5] 1417.00% [5] 13.13% [1] 13.13% [1] 13.13% [1] 13.13% [1]
Total first lien senior secured loans $ 68.3 [2],[3]   $ 68.3 [2],[3]   $ 68.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 68.3 [2],[3]   68.3 [2],[3]   68.3 [6],[7]                
Investment, Identifier [Axis]: Captive Resources Midco, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.2   1.2   1.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 1.2   1.2   1.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.2   $ 1.2   $ 1.2                
Investment, Identifier [Axis]: Captive Resources Midco, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 11.07% [5]   11.07% [5]   7.20% [1] 11.07% [5] 11.07% [5] 11.07% [5] 11.07% [5] 7.20% [1] 7.20% [1] 7.20% [1] 7.20% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Cardinal Parent, Inc. and Packers Software Intermediate Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.0   5.0   5.0                
Less: funded commitments (4.9)   (4.9)   (3.4)                
Total unfunded commitments 0.1   0.1   1.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.1   $ 0.1   $ 1.6                
Investment, Identifier [Axis]: Cardinal Parent, Inc. and Packers Software Intermediate Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1200.00% [5]   1200.00% [5]   11.00% [1] 1200.00% [5] 1200.00% [5] 1200.00% [5] 1200.00% [5] 11.00% [1] 11.00% [1] 11.00% [1] 11.00% [1]
Total first lien senior secured loans $ 4.9 [2],[3]   $ 4.9 [2],[3]   $ 3.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.7 [2],[3]   $ 4.7 [2],[3]   $ 3.0 [6],[7]                
Investment, Identifier [Axis]: Cardinal Parent, Inc. and Packers Software Intermediate Holdings, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1329.00% [5]   1329.00% [5]   12.46% [1] 1329.00% [5] 1329.00% [5] 1329.00% [5] 1329.00% [5] 12.46% [1] 12.46% [1] 12.46% [1] 12.46% [1]
Total first lien senior secured loans $ 64.3 [2],[3]   $ 64.3 [2],[3]   $ 64.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 61.0 [2],[3]   61.0 [2],[3]   57.8 [6],[7]                
Investment, Identifier [Axis]: Cardinal Parent, Inc. and Packers Software Intermediate Holdings, Inc., Series A preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 29.7 [3]   29.7 [3]   26.3 [7]                
Investment, Identifier [Axis]: Cardinal Parent, Inc. and Packers Software Intermediate Holdings, Inc., Series A-2 preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 10.6 [3]   10.6 [3]   9.4 [7]                
Investment, Identifier [Axis]: Cardinal Parent, Inc. and Packers Software Intermediate Holdings, Inc., Series A-3 preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 12.8 [3]   12.8 [3]   11.1 [7]                
Investment, Identifier [Axis]: Center for Autism and Related Disorders, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.5   9.5   20.4                
Less: funded commitments (9.5)   (9.5)   (9.0)                
Total unfunded commitments 0.0   0.0   11.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   (11.4)                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0   0.0                
Investment, Identifier [Axis]: Center for Autism and Related Disorders, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [2],[3],[12] 2.9   2.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[12] 0.0   0.0                    
Investment, Identifier [Axis]: Center for Autism and Related Disorders, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7],[9]         9.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[9]         4.0                
Investment, Identifier [Axis]: Center for Autism and Related Disorders, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7],[9]         2.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[9]         0.9                
Investment, Identifier [Axis]: Center for Autism and Related Disorders, LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 6.8 [3],[12],[13]   6.8 [3],[12],[13]   6.8 [7],[9],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3],[12],[13]   0.0 [3],[12],[13]   2.9 [7],[9],[14]                
Investment, Identifier [Axis]: Center for Autism and Related Disorders, LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 1.0 [3],[12],[13]   1.0 [3],[12],[13]   0.6 [7],[9],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3],[12],[13]   0.0 [3],[12],[13]   0.2 [7],[9],[14]                
Investment, Identifier [Axis]: Centric Brands LLC and Centric Brands GP LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.6   8.6   8.6                
Less: funded commitments (6.3)   (6.3)   (5.0)                
Total unfunded commitments 2.3   2.3   3.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.3   $ 2.3   $ 3.6                
Investment, Identifier [Axis]: Centric Brands LLC and Centric Brands GP LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 12.38% [5]   12.38% [5]   13.30% [1] 12.38% [5] 12.38% [5] 12.38% [5] 12.38% [5] 13.30% [1] 13.30% [1] 13.30% [1] 13.30% [1]
Total first lien senior secured loans $ 79.2 [2],[3]   $ 79.2 [2],[3]   $ 75.4 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 76.0 [2],[3]   $ 76.0 [2],[3]   $ 70.9 [6],[7],[16]                
Investment, Identifier [Axis]: Centric Brands LLC and Centric Brands GP LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1110.00% [5]   1110.00% [5]   9.70% [1] 1110.00% [5] 1110.00% [5] 1110.00% [5] 1110.00% [5] 9.70% [1] 9.70% [1] 9.70% [1] 9.70% [1]
Total first lien senior secured loans $ 6.3 [2],[3]   $ 6.3 [2],[3]   $ 5.0 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 6.3 [2],[3]   6.3 [2],[3]   4.7 [6],[7],[16]                
Investment, Identifier [Axis]: Centric Brands LLC and Centric Brands GP LLC, Membership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   2.9 [7],[16]                
Investment, Identifier [Axis]: Chariot Buyer LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.3   12.3   12.3                
Less: funded commitments 0.0   0.0   (3.5)                
Total unfunded commitments 12.3   12.3   8.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 12.3   $ 12.3   $ 8.8                
Investment, Identifier [Axis]: Chariot Buyer LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         7.38%         7.38% 7.38% 7.38% 7.38%
Total first lien senior secured loans [7]         $ 3.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 3.2                
Investment, Identifier [Axis]: Chariot Buyer LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1217.00% [5]   1217.00% [5]   11.13% [1] 1217.00% [5] 1217.00% [5] 1217.00% [5] 1217.00% [5] 11.13% [1] 11.13% [1] 11.13% [1] 11.13% [1]
Total first lien senior secured loans $ 134.4 [2],[3]   $ 134.4 [2],[3]   $ 134.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 133.0 [2],[3]   133.0 [2],[3]   126.3 [6],[7]                
Investment, Identifier [Axis]: Cheyenne Petroleum Company Limited Partnership, CPC 2001 LLC and Mill Shoals LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.5   9.5   9.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 9.5   9.5   9.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 9.5   $ 9.5   $ 9.5                
Investment, Identifier [Axis]: Cheyenne Petroleum Company Limited Partnership, CPC 2001 LLC and Mill Shoals LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1449.00% [5]   1449.00% [5]   13.69% [1] 1449.00% [5] 1449.00% [5] 1449.00% [5] 1449.00% [5] 13.69% [1] 13.69% [1] 13.69% [1] 13.69% [1]
Total first lien senior secured loans $ 49.3 [2],[3]   $ 49.3 [2],[3]   $ 49.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 49.3 [2],[3]   49.3 [2],[3]   $ 47.8 [6],[7]                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.48%         15.48% 15.48% 15.48% 15.48%
Total first lien senior secured loans [6],[7]         $ 68.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 66.9                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.48%         15.48% 15.48% 15.48% 15.48%
Total first lien senior secured loans [6],[7]         $ 30.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 29.4                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.48%         15.48% 15.48% 15.48% 15.48%
Total first lien senior secured loans [6],[7]         $ 20.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 19.6                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.48%         15.48% 15.48% 15.48% 15.48%
Total first lien senior secured loans [6],[7]         $ 15.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 15.2                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., First lien senior secured loan 5                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.23%         15.23% 15.23% 15.23% 15.23%
Total first lien senior secured loans [6],[7]         $ 12.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 11.9                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., First lien senior secured loan 6                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.48%         15.48% 15.48% 15.48% 15.48%
Total first lien senior secured loans [6],[7]         $ 4.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 4.8                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., First lien senior secured loan 7                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.48%         15.48% 15.48% 15.48% 15.48%
Total first lien senior secured loans [6],[7]         $ 3.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 3.0                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., First lien senior secured loan 8                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         15.48%         15.48% 15.48% 15.48% 15.48%
Total first lien senior secured loans [6],[7]         $ 3.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         3.0                
Investment, Identifier [Axis]: Cipriani USA, Inc. and Cipriani Group Holding S.A.R.L., Warrant to purchase units of shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[8]         8.8                
Investment, Identifier [Axis]: City Line Distributors LLC and City Line Investments LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.7   1.7                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.7   1.7                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 1.7   1.7                    
Investment, Identifier [Axis]: City Line Distributors LLC and City Line Investments LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 3.5   $ 3.5                    
Investment, Identifier [Axis]: City Line Distributors LLC and City Line Investments LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1165.00%   1165.00%     1165.00% 1165.00% 1165.00% 1165.00%        
Total first lien senior secured loans [2],[3] $ 3.2   $ 3.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 3.1   3.1                    
Investment, Identifier [Axis]: Clarion Home Services Group, LLC and LBC Breeze Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.0   8.0                    
Less: funded commitments (0.9)   (0.9)                    
Total unfunded commitments 7.1   7.1                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 7.1   7.1                    
Investment, Identifier [Axis]: Clarion Home Services Group, LLC and LBC Breeze Holdings LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.0   $ 6.0                    
Investment, Identifier [Axis]: Clarion Home Services Group, LLC and LBC Breeze Holdings LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1193.00%   1193.00%     1193.00% 1193.00% 1193.00% 1193.00%        
Total first lien senior secured loans [2],[3] $ 3.2   $ 3.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 3.1   $ 3.1                    
Investment, Identifier [Axis]: Clarion Home Services Group, LLC and LBC Breeze Holdings LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1225.00%   1225.00%     1225.00% 1225.00% 1225.00% 1225.00%        
Total first lien senior secured loans [2],[3] $ 6.1   $ 6.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 5.9   $ 5.9                    
Investment, Identifier [Axis]: Clarion Home Services Group, LLC and LBC Breeze Holdings LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1146.00%   1146.00%     1146.00% 1146.00% 1146.00% 1146.00%        
Total first lien senior secured loans [2],[3] $ 0.9   $ 0.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.9   0.9                    
Investment, Identifier [Axis]: Cloud Software Group, Inc., Picard Parent, Inc., Cloud Software Group Holdings, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 19.0   19.0                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 19.0   19.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 19.0   $ 19.0                    
Investment, Identifier [Axis]: Cloud Software Group, Inc., Picard Parent, Inc., Cloud Software Group Holdings, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 999.00%   999.00%     999.00% 999.00% 999.00% 999.00%        
Total first lien senior secured loans [2],[3],[10] $ 10.8   $ 10.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[10] $ 10.4   $ 10.4                    
Investment, Identifier [Axis]: Cloud Software Group, Inc., Picard Parent, Inc., Cloud Software Group Holdings, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., First lien senior secured notes                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 650.00%   650.00%     650.00% 650.00% 650.00% 650.00%        
Total first lien senior secured loans [3],[10] $ 88.9   $ 88.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[10] 78.6   78.6                    
Investment, Identifier [Axis]: Cloud Software Group, Inc., Picard Parent, Inc., Cloud Software Group Holdings, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 17.5   $ 17.5                    
Investment, Identifier [Axis]: Cloud Software Group, Inc., Picard Parent, Inc., Cloud Software Group Holdings, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., Second lien senior secured notes                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 900.00%   900.00%     900.00% 900.00% 900.00% 900.00%        
Total first lien senior secured loans [3],[10] $ 121.0   $ 121.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[10] 105.1   105.1                    
Investment, Identifier [Axis]: Cloud Software Group, Inc., Picard Parent, Inc., Cloud Software Group Holdings, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 127.9   127.9                    
Investment, Identifier [Axis]: CoLTs 2005-1 Ltd.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   0.0                
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: CoLTs 2005-1 Ltd., Preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [4]   0.0 [4]   0.0 [8]                
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.3   6.3   7.8                
Less: funded commitments (0.8)   (0.8)   (2.5)                
Total unfunded commitments 5.5   5.5   5.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 5.5   5.5   5.3                
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc., Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   $ 0.0 [7]                
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.63%         9.63% 9.63% 9.63% 9.63%
Total first lien senior secured loans [6],[7]         $ 30.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 29.0                
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1143.00%   1143.00%     1143.00% 1143.00% 1143.00% 1143.00%        
Total first lien senior secured loans [2],[3] $ 31.5   $ 31.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 31.2   $ 31.2                    
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1143.00%   1143.00%     1143.00% 1143.00% 1143.00% 1143.00%        
Total first lien senior secured loans [2],[3] $ 11.6   $ 11.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 11.5   $ 11.5                    
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1143.00% [5]   1143.00% [5]   9.63% [1] 1143.00% [5] 1143.00% [5] 1143.00% [5] 1143.00% [5] 9.63% [1] 9.63% [1] 9.63% [1] 9.63% [1]
Total first lien senior secured loans $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 2.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.8 [2],[3]   0.8 [2],[3]   2.4 [6],[7]                
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc., Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.4 [3]   4.4 [3]   4.0 [7]                
Investment, Identifier [Axis]: Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc., Series A preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 78.0 [2],[3]   $ 78.0 [2],[3]   $ 69.7 [7]                
Investment, Identifier [Axis]: Color Intermediate, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1099.00% [5]   1099.00% [5]   10.08% [1] 1099.00% [5] 1099.00% [5] 1099.00% [5] 1099.00% [5] 10.08% [1] 10.08% [1] 10.08% [1] 10.08% [1]
Total first lien senior secured loans $ 20.2 [2],[3]   $ 20.2 [2],[3]   $ 20.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 20.2 [2],[3]   20.2 [2],[3]   19.5 [6],[7]                
Investment, Identifier [Axis]: Commercial Trailer Leasing, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.6                
Less: funded commitments         0.0                
Total unfunded commitments         0.6                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.6                
Investment, Identifier [Axis]: Commercial Trailer Leasing, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.33%         10.33% 10.33% 10.33% 10.33%
Total first lien senior secured loans [6],[7]         $ 33.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 33.3                
Investment, Identifier [Axis]: Commercial Trailer Leasing, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         13.00%         13.00% 13.00% 13.00% 13.00%
Total first lien senior secured loans [7]         $ 19.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         19.5                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.2   7.2   7.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 7.2   7.2   7.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 7.2   7.2   7.2                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.2 [3]   $ 6.2 [3]   $ 6.4 [7]                
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1102.00% [5]   1102.00% [5]   10.17% [1] 1102.00% [5] 1102.00% [5] 1102.00% [5] 1102.00% [5] 10.17% [1] 10.17% [1] 10.17% [1] 10.17% [1]
Total first lien senior secured loans $ 10.5 [2],[3]   $ 10.5 [2],[3]   $ 10.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 10.3 [2],[3]   10.3 [2],[3]   10.4 [6],[7]                
Investment, Identifier [Axis]: Compex Legal Services, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.6   3.6   3.6                
Less: funded commitments (0.4)   (0.4)   (1.8)                
Total unfunded commitments 3.2   3.2   1.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.2   $ 3.2   $ 1.8                
Investment, Identifier [Axis]: Compex Legal Services, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1145.00%   1145.00%     1145.00% 1145.00% 1145.00% 1145.00%        
Total first lien senior secured loans [2],[3] $ 2.0   $ 2.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 2.0   $ 2.0                    
Investment, Identifier [Axis]: Compex Legal Services, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1094.00% [5]   1094.00% [5]   9.51% [1] 1094.00% [5] 1094.00% [5] 1094.00% [5] 1094.00% [5] 9.51% [1] 9.51% [1] 9.51% [1] 9.51% [1]
Total first lien senior secured loans $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 1.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.4 [2],[3]   0.4 [2],[3]   1.8 [6],[7]                
Investment, Identifier [Axis]: Comprehensive EyeCare Partners, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.9   1.9   1.9                
Less: funded commitments (1.9)   (1.9)   (0.8)                
Total unfunded commitments 0.0   0.0   1.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.0   $ 0.0   $ 1.1                
Investment, Identifier [Axis]: Comprehensive EyeCare Partners, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 12.15% [5]   12.15% [5]   10.59% [1] 12.15% [5] 12.15% [5] 12.15% [5] 12.15% [5] 10.59% [1] 10.59% [1] 10.59% [1] 10.59% [1]
Total first lien senior secured loans $ 0.3 [2],[3]   $ 0.3 [2],[3]   $ 0.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.3 [2],[3]   $ 0.3 [2],[3]   $ 0.3 [6],[7]                
Investment, Identifier [Axis]: Comprehensive EyeCare Partners, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 12.15% [5]   12.15% [5]   10.58% [1] 12.15% [5] 12.15% [5] 12.15% [5] 12.15% [5] 10.58% [1] 10.58% [1] 10.58% [1] 10.58% [1]
Total first lien senior secured loans $ 1.9 [2],[3]   $ 1.9 [2],[3]   $ 0.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.8 [2],[3]   $ 1.8 [2],[3]   $ 0.7 [6],[7]                
Investment, Identifier [Axis]: Computer Services, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1216.00% [5]   1216.00% [5]   11.15% [1] 1216.00% [5] 1216.00% [5] 1216.00% [5] 1216.00% [5] 11.15% [1] 11.15% [1] 11.15% [1] 11.15% [1]
Total first lien senior secured loans $ 33.9 [2],[3]   $ 33.9 [2],[3]   $ 34.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 33.9 [2],[3]   33.9 [2],[3]   33.0 [6],[7]                
Investment, Identifier [Axis]: Concert Golf Partners Holdco LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.1   3.1   3.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.1   3.1   3.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 3.1   3.1   3.1                
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 11.8   11.8   14.2                
Less: funded commitments (9.2)   (9.2)   (0.8)                
Total unfunded commitments 2.6   2.6   13.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.6   2.6   13.4                
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.7 [3],[4]   $ 7.7 [3],[4]   $ 6.5 [7],[8]                
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.48% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 74.3 [2],[3],[4]   $ 74.3 [2],[3],[4]   $ 11.7 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 72.1 [2],[3],[4]   $ 72.1 [2],[3],[4]   $ 11.4 [6],[7],[8]                
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1019.00% [5]   1019.00% [5]   10.48% [1] 1019.00% [5] 1019.00% [5] 1019.00% [5] 1019.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 28.7 [2],[3],[4]   $ 28.7 [2],[3],[4]   $ 74.8 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 27.9 [2],[3],[4]   $ 27.9 [2],[3],[4]   $ 72.6 [6],[7],[8]                
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   8.39% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 8.39% [1] 8.39% [1] 8.39% [1] 8.39% [1]
Total first lien senior secured loans $ 11.6 [2],[3],[4]   $ 11.6 [2],[3],[4]   $ 26.9 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 11.3 [2],[3],[4]   $ 11.3 [2],[3],[4]   $ 26.1 [7],[8]                
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.32%         8.32% 8.32% 8.32% 8.32%
Total first lien senior secured loans [6],[7],[8]         $ 0.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         0.8                
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1129.00%   1129.00%     1129.00% 1129.00% 1129.00% 1129.00%        
Total first lien senior secured loans [2],[3],[4] $ 8.7   $ 8.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 8.5   $ 8.5                    
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1020.00%   1020.00%     1020.00% 1020.00% 1020.00% 1020.00%        
Total first lien senior secured loans [2],[3],[4] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 0.2   $ 0.2                    
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., First lien senior secured revolving loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1129.00%   1129.00%     1129.00% 1129.00% 1129.00% 1129.00%        
Total first lien senior secured loans [2],[3],[4] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 0.2   0.2                    
Investment, Identifier [Axis]: Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P., Series A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3],[4]   $ 0.0 [3],[4]   $ 0.0 [7],[8]                
Investment, Identifier [Axis]: Continental Acquisition Holdings, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   11.48% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 11.48% [1] 11.48% [1] 11.48% [1] 11.48% [1]
Total first lien senior secured loans $ 35.9 [2],[3]   $ 35.9 [2],[3]   $ 36.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 30.5 [2],[3]   $ 30.5 [2],[3]   $ 33.3 [6],[7]                
Investment, Identifier [Axis]: Continental Acquisition Holdings, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   11.48% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 11.48% [1] 11.48% [1] 11.48% [1] 11.48% [1]
Total first lien senior secured loans $ 5.3 [2],[3]   $ 5.3 [2],[3]   $ 5.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.5 [2],[3]   4.5 [2],[3]   4.9 [6],[7]                
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.8   1.8   8.0                
Less: funded commitments (0.7)   (0.7)   (0.7)                
Total unfunded commitments 1.1   1.1   7.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.1   $ 1.1   $ 7.3                
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         11.38%         11.38% 11.38% 11.38% 11.38%
Total first lien senior secured loans [6],[7]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 0.1                
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1142.00%   1142.00%     1142.00% 1142.00% 1142.00% 1142.00%        
Total first lien senior secured loans [2],[3] $ 6.4   $ 6.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 6.4   $ 6.4                    
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1140.00%   1140.00%     1140.00% 1140.00% 1140.00% 1140.00%        
Total first lien senior secured loans [2],[3] $ 1.3   $ 1.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.3   $ 1.3                    
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1167.00%   1167.00%     1167.00% 1167.00% 1167.00% 1167.00%        
Total first lien senior secured loans [2],[3] $ 1.6   $ 1.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.6   $ 1.6                    
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         13.50%         13.50% 13.50% 13.50% 13.50%
Total first lien senior secured loans [6],[7]         $ 0.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.7                
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1350.00%   1350.00%     1350.00% 1350.00% 1350.00% 1350.00%        
Total first lien senior secured loans [2],[3] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.2   $ 0.2                    
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1142.00%   1142.00%     1142.00% 1142.00% 1142.00% 1142.00%        
Total first lien senior secured loans [2],[3] $ 0.5   $ 0.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.5   $ 0.5                    
Investment, Identifier [Axis]: Continental Café, LLC and Infinity Ovation Yacht Charters, LLC, First lien senior secured revolving loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1350.00%   1350.00%     1350.00% 1350.00% 1350.00% 1350.00%        
Total first lien senior secured loans [2] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2] 1.0   1.0                    
Investment, Identifier [Axis]: Convera International Holdings Limited and Convera International Financial S.A R.L.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.3   2.3   2.3                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.3   2.3   2.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.3   $ 2.3   $ 2.3                
Investment, Identifier [Axis]: Convera International Holdings Limited and Convera International Financial S.A R.L., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.33%         10.33% 10.33% 10.33% 10.33%
Total first lien senior secured loans [6],[7],[8]         $ 62.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         $ 62.8                
Investment, Identifier [Axis]: Convera International Holdings Limited and Convera International Financial S.A R.L., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1154.00%   1154.00%     1154.00% 1154.00% 1154.00% 1154.00%        
Total first lien senior secured loans [2],[3],[4] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 0.1   $ 0.1                    
Investment, Identifier [Axis]: Convera International Holdings Limited and Convera International Financial S.A R.L., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1154.00%   1154.00%     1154.00% 1154.00% 1154.00% 1154.00%        
Total first lien senior secured loans [2],[3],[4] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 0.1   $ 0.1                    
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1074.00% [5]   1074.00% [5]   9.48% [1] 1074.00% [5] 1074.00% [5] 1074.00% [5] 1074.00% [5] 9.48% [1] 9.48% [1] 9.48% [1] 9.48% [1]
Total first lien senior secured loans $ 2.7 [2],[3],[4]   $ 2.7 [2],[3],[4]   $ 2.7 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.4 [2],[3],[4]   $ 2.4 [2],[3],[4]   $ 2.6 [6],[7],[8]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1074.00% [5]   1074.00% [5]   9.83% [1] 1074.00% [5] 1074.00% [5] 1074.00% [5] 1074.00% [5] 9.83% [1] 9.83% [1] 9.83% [1] 9.83% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1074.00% [5]   1074.00% [5]   9.93% [1] 1074.00% [5] 1074.00% [5] 1074.00% [5] 1074.00% [5] 9.93% [1] 9.93% [1] 9.93% [1] 9.93% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3],[4]   0.1 [2],[3],[4]   0.1 [6],[7],[8]                
Investment, Identifier [Axis]: CoreLogic, Inc. and T-VIII Celestial Co-Invest LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 38.9   38.9   38.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 38.9   38.9   38.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 38.9   38.9   38.9                
Investment, Identifier [Axis]: CoreLogic, Inc. and T-VIII Celestial Co-Invest LP, Limited partnership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 38.4 [3]   $ 38.4 [3]   $ 48.8 [7]                
Investment, Identifier [Axis]: CoreLogic, Inc. and T-VIII Celestial Co-Invest LP, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1193.00% [5]   1193.00% [5]   10.94% [1] 1193.00% [5] 1193.00% [5] 1193.00% [5] 1193.00% [5] 10.94% [1] 10.94% [1] 10.94% [1] 10.94% [1]
Total first lien senior secured loans $ 155.7 [2],[3]   $ 155.7 [2],[3]   $ 155.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 140.1 [2],[3]   140.1 [2],[3]   129.2 [6],[7]                
Investment, Identifier [Axis]: Corient Holdings, Inc., Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 41.4   41.4                    
Investment, Identifier [Axis]: Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.1   0.1   0.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.1   0.1   0.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.1   0.1   0.1                
Investment, Identifier [Axis]: Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc., Common equity                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3],[4]   $ 0.0 [3],[4]   $ 0.0 [7],[8]                
Investment, Identifier [Axis]: Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1025.00% [5]   1025.00% [5]   10.31% [1] 1025.00% [5] 1025.00% [5] 1025.00% [5] 1025.00% [5] 10.31% [1] 10.31% [1] 10.31% [1] 10.31% [1]
Total first lien senior secured loans $ 6.2 [2],[3],[4]   $ 6.2 [2],[3],[4]   $ 6.2 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.2 [2],[3],[4]   $ 6.2 [2],[3],[4]   $ 6.2 [6],[7],[8]                
Investment, Identifier [Axis]: Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1025.00% [5]   1025.00% [5]   9.06% [1] 1025.00% [5] 1025.00% [5] 1025.00% [5] 1025.00% [5] 9.06% [1] 9.06% [1] 9.06% [1] 9.06% [1]
Total first lien senior secured loans $ 4.3 [2],[3],[4]   $ 4.3 [2],[3],[4]   $ 4.4 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.3 [2],[3],[4]   $ 4.3 [2],[3],[4]   $ 4.3 [6],[7],[8]                
Investment, Identifier [Axis]: Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1225.00% [5]   1225.00% [5]   11.06% [1] 1225.00% [5] 1225.00% [5] 1225.00% [5] 1225.00% [5] 11.06% [1] 11.06% [1] 11.06% [1] 11.06% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investment, Identifier [Axis]: Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1125.00% [5]   1125.00% [5]   9.06% [1] 1125.00% [5] 1125.00% [5] 1125.00% [5] 1125.00% [5] 9.06% [1] 9.06% [1] 9.06% [1] 9.06% [1]
Total first lien senior secured loans $ 0.2 [2],[3],[4]   $ 0.2 [2],[3],[4]   $ 6.3 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3],[4]   $ 0.2 [2],[3],[4]   6.2 [6],[7],[8]                
Investment, Identifier [Axis]: Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc., First lien senior secured loan 5                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1125.00%   1125.00%     1125.00% 1125.00% 1125.00% 1125.00%        
Total first lien senior secured loans [2],[3],[4] $ 7.7   $ 7.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 7.7   7.7                    
Investment, Identifier [Axis]: Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc., Preferred equity                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.8 [3],[4]   0.8 [3],[4]   0.7 [7],[8]                
Investment, Identifier [Axis]: Cornerstone OnDemand, Inc. and Sunshine Software Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 38.7   38.7   38.7                
Less: funded commitments (0.5)   (0.5)   (22.7)                
Total unfunded commitments 38.2   38.2   16.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 38.2   38.2   16.0                
Investment, Identifier [Axis]: Cornerstone OnDemand, Inc. and Sunshine Software Holdings, Inc., Class A-1 common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 16.8 [3]   16.8 [3]   $ 15.2 [7]                
Investment, Identifier [Axis]: Cornerstone OnDemand, Inc. and Sunshine Software Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         7.51%         7.51% 7.51% 7.51% 7.51%
Total first lien senior secured loans 0.0 [17]   0.0 [17]   $ 21.9 [7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [17]   $ 0.0 [17]   $ 19.7 [7],[14]                
Investment, Identifier [Axis]: Cornerstone OnDemand, Inc. and Sunshine Software Holdings, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1193.00% [5]   1193.00% [5]   10.88% [1] 1193.00% [5] 1193.00% [5] 1193.00% [5] 1193.00% [5] 10.88% [1] 10.88% [1] 10.88% [1] 10.88% [1]
Total first lien senior secured loans $ 137.5 [2],[3]   $ 137.5 [2],[3]   $ 137.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 130.6 [2],[3]   130.6 [2],[3]   123.7 [6],[7]                
Investment, Identifier [Axis]: Cornerstone OnDemand, Inc. and Sunshine Software Holdings, Inc., Series A preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 119.3 [3]   119.3 [3]   109.4 [7]                
Investment, Identifier [Axis]: Coupa Holdings, LLC and Coupa Software Incorporated                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.9   0.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.9   0.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.9   $ 0.9                    
Investment, Identifier [Axis]: Coupa Holdings, LLC and Coupa Software Incorporated, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1282.00%   1282.00%     1282.00% 1282.00% 1282.00% 1282.00%        
Total first lien senior secured loans [2],[3] $ 9.0   $ 9.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 9.0   9.0                    
Investment, Identifier [Axis]: Covaris Intermediate 3, LLC & Covaris Parent, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 19.7   19.7   22.2                
Less: funded commitments 0.0   0.0   (1.5)                
Total unfunded commitments 19.7   19.7   20.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 19.7   19.7   20.7                
Investment, Identifier [Axis]: Covaris Intermediate 3, LLC & Covaris Parent, LLC, Class A-2 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.9   $ 4.9   $ 5.5                
Investment, Identifier [Axis]: Covaris Intermediate 3, LLC & Covaris Parent, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1079.00% [5]   1079.00% [5]   9.16% [1] 1079.00% [5] 1079.00% [5] 1079.00% [5] 1079.00% [5] 9.16% [1] 9.16% [1] 9.16% [1] 9.16% [1]
Total first lien senior secured loans $ 2.6 [2],[3]   $ 2.6 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.6 [2],[3]   2.6 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Covaris Intermediate 3, LLC & Covaris Parent, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.66%         9.66% 9.66% 9.66% 9.66%
Total first lien senior secured loans [6],[7]         $ 1.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         1.5                
Investment, Identifier [Axis]: Coyote Buyer, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.8   5.8   5.8                
Less: funded commitments (4.0)   (4.0)   0.0                
Total unfunded commitments 1.8   1.8   5.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.8   $ 1.8   5.8                
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1150.00%   1150.00%     1150.00% 1150.00% 1150.00% 1150.00%        
Total first lien senior secured loans [2],[3] $ 4.0   $ 4.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 3.8   $ 3.8                    
Investment, Identifier [Axis]: CrossCountry Mortgage, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         56.3                
Less: funded commitments         0.0                
Total unfunded commitments         56.3                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 56.3                
Investment, Identifier [Axis]: CrossCountry Mortgage, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1242.00% [5]   1242.00% [5]   11.73% [1] 1242.00% [5] 1242.00% [5] 1242.00% [5] 1242.00% [5] 11.73% [1] 11.73% [1] 11.73% [1] 11.73% [1]
Total first lien senior secured loans $ 93.8 [2],[3]   $ 93.8 [2],[3]   $ 93.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 94.7 [2],[3]   94.7 [2],[3]   92.8 [6],[7]                
Investment, Identifier [Axis]: Crown CT Parent Inc., Crown CT HoldCo Inc. and Crown CT Management LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.2   3.2   3.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.2   3.2   3.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 3.2   3.2   3.2                
Investment, Identifier [Axis]: Crown CT Parent Inc., Crown CT HoldCo Inc. and Crown CT Management LLC, Class A shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.5 [3]   1.5 [3]   1.9 [7]                
Investment, Identifier [Axis]: Crown CT Parent Inc., Crown CT HoldCo Inc. and Crown CT Management LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [3]   $ 0.2 [3]   $ 0.3 [7]                
Investment, Identifier [Axis]: Crown CT Parent Inc., Crown CT HoldCo Inc. and Crown CT Management LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   10.11% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 10.11% [1] 10.11% [1] 10.11% [1] 10.11% [1]
Total first lien senior secured loans $ 24.3 [2],[3]   $ 24.3 [2],[3]   $ 24.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 23.4 [2],[3]   23.4 [2],[3]   24.5 [6],[7]                
Investment, Identifier [Axis]: DFC Global Facility Borrower III LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 74.4   74.4   96.7                
Less: funded commitments (63.0)   (63.0)   (79.3)                
Total unfunded commitments 11.4   11.4   17.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 11.4   $ 11.4   $ 17.4                
Investment, Identifier [Axis]: DFC Global Facility Borrower III LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1293.00% [5]   1293.00% [5]   11.62% [1] 1293.00% [5] 1293.00% [5] 1293.00% [5] 1293.00% [5] 11.62% [1] 11.62% [1] 11.62% [1] 11.62% [1]
Total first lien senior secured loans $ 96.9 [2],[3],[4],[18]   $ 96.9 [2],[3],[4],[18]   $ 158.6 [6],[7],[8],[19]                
Participating interest sold 34.2   34.2   79.0                
Secured borrowings 34.2   34.2   79.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 96.9 [2],[3],[4],[18]   $ 96.9 [2],[3],[4],[18]   $ 158.6 [6],[7],[8],[19]                
Investment, Identifier [Axis]: DFC Global Facility Borrower III LLC, First lien senior secured revolving loan, Secured borrowing                          
Schedule of Investments [Line Items]                          
Coupon | Rate 12.93%   12.93%   11.62% 12.93% 12.93% 12.93% 12.93% 11.62% 11.62% 11.62% 11.62%
Investment, Identifier [Axis]: DFS Holding Company, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments $ 0.3   $ 0.3                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.3   0.3                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.3   $ 0.3                    
Investment, Identifier [Axis]: DFS Holding Company, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1242.00%   1242.00%     1242.00% 1242.00% 1242.00% 1242.00%        
Total first lien senior secured loans [2],[3] $ 2.1   $ 2.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 2.1   2.1                    
Investment, Identifier [Axis]: DFS Holding Company, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.44%         9.44% 9.44% 9.44% 9.44%
Total first lien senior secured loans [6],[7]         $ 164.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 164.9                
Investment, Identifier [Axis]: DFS Holding Company, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.38%         10.38% 10.38% 10.38% 10.38%
Total first lien senior secured loans [6],[7]         $ 6.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 6.5                
Investment, Identifier [Axis]: DFS Holding Company, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.38%         10.38% 10.38% 10.38% 10.38%
Total first lien senior secured loans [6],[7]         $ 4.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         4.3                
Investment, Identifier [Axis]: DRS Holdings III, Inc. and DRS Holdings I, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.8   10.8   10.8                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 10.8   10.8   10.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 10.8   10.8   10.8                
Investment, Identifier [Axis]: DRS Holdings III, Inc. and DRS Holdings I, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.5 [3]   $ 8.5 [3]   $ 7.2 [7],[16]                
Investment, Identifier [Axis]: DRS Holdings III, Inc. and DRS Holdings I, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.47% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.47% [1] 10.47% [1] 10.47% [1] 10.47% [1]
Total first lien senior secured loans $ 27.5 [2],[3]   $ 27.5 [2],[3]   $ 28.0 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 26.4 [2],[3]   $ 26.4 [2],[3]   $ 26.8 [6],[7],[16]                
Investment, Identifier [Axis]: DRS Holdings III, Inc. and DRS Holdings I, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.47% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.47% [1] 10.47% [1] 10.47% [1] 10.47% [1]
Total first lien senior secured loans $ 25.4 [2],[3]   $ 25.4 [2],[3]   $ 25.8 [6],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 24.4 [2],[3]   24.4 [2],[3]   24.8 [6],[16]                
Investment, Identifier [Axis]: DS Admiral Bidco, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.1   0.1   0.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.1   0.1   0.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.1   $ 0.1   $ 0.1                
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1189.00% [5]   1189.00% [5]   10.16% [1] 1189.00% [5] 1189.00% [5] 1189.00% [5] 1189.00% [5] 10.16% [1] 10.16% [1] 10.16% [1] 10.16% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: DTI Holdco, Inc. and OPE DTI Holdings, Inc., Class A common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 7.4 [3]   7.4 [3]   6.3 [7]                
Investment, Identifier [Axis]: DTI Holdco, Inc. and OPE DTI Holdings, Inc., Class B common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   $ 0.0 [7]                
Investment, Identifier [Axis]: Datix Bidco Limited, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 953.00% [5]   953.00% [5]   8.95% [1] 953.00% [5] 953.00% [5] 953.00% [5] 953.00% [5] 8.95% [1] 8.95% [1] 8.95% [1] 8.95% [1]
Total first lien senior secured loans $ 4.3 [3],[4]   $ 4.3 [3],[4]   $ 4.3 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.2 [3],[4]   $ 4.2 [3],[4]   $ 4.2 [7],[8]                
Investment, Identifier [Axis]: Datix Bidco Limited, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1278.00% [5]   1278.00% [5]   12.20% [1] 1278.00% [5] 1278.00% [5] 1278.00% [5] 1278.00% [5] 12.20% [1] 12.20% [1] 12.20% [1] 12.20% [1]
Total first lien senior secured loans $ 0.7 [3],[4]   $ 0.7 [3],[4]   $ 0.7 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.7 [3],[4]   0.7 [3],[4]   $ 0.7 [7],[8]                
Investment, Identifier [Axis]: Daylight Beta Parent LLC and CFCo, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0                    
Redemptions (cost)     0.0                    
Sales (cost)     0.0                    
Interest income     0.0                    
Capital structuring service fees     0.0                    
Dividend income     0.0                    
Other income     0.0                    
Net realized gains (losses):     0.0                    
Net unrealized gains (losses):     0.0                    
Fair Value 12.1   12.1                    
Investment, Identifier [Axis]: Daylight Beta Parent LLC and CFCo, LLC, Class B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: Daylight Beta Parent LLC and CFCo, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3] 11.7   11.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 11.7   11.7                    
Investment, Identifier [Axis]: Daylight Beta Parent LLC and CFCo, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3] 20.8   20.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 0.4   $ 0.4                    
Investment, Identifier [Axis]: Dcert Buyer, Inc., DCert Preferred Holdings, Inc. and Destiny Digital Holdings, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.70%         8.70% 8.70% 8.70% 8.70%
Total first lien senior secured loans [7]         $ 1.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 0.9                
Investment, Identifier [Axis]: Dcert Buyer, Inc., DCert Preferred Holdings, Inc. and Destiny Digital Holdings, L.P., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1232.00% [5]   1232.00% [5]   11.70% [1] 1232.00% [5] 1232.00% [5] 1232.00% [5] 1232.00% [5] 11.70% [1] 11.70% [1] 11.70% [1] 11.70% [1]
Total first lien senior secured loans $ 11.0 [3]   $ 11.0 [3]   $ 11.0 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 10.9 [3]   10.9 [3]   10.7 [7]                
Investment, Identifier [Axis]: Dcert Buyer, Inc., DCert Preferred Holdings, Inc. and Destiny Digital Holdings, L.P., Series A preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 143.3 [3]   143.3 [3]   134.6 [7]                
Investment, Identifier [Axis]: Dcert Buyer, Inc., DCert Preferred Holdings, Inc. and Destiny Digital Holdings, L.P., Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 9.0 [3]   9.0 [3]   12.5 [7]                
Investment, Identifier [Axis]: DecoPac, Inc. and KCAKE Holdings Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 16.5   16.5   16.5                
Less: funded commitments (5.7)   (5.7)   (6.6)                
Total unfunded commitments 10.8   10.8   9.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 10.8   10.8   9.9                
Investment, Identifier [Axis]: DecoPac, Inc. and KCAKE Holdings Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.7 [3]   $ 9.7 [3]   $ 9.4 [7]                
Investment, Identifier [Axis]: DecoPac, Inc. and KCAKE Holdings Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 1154.00% [5]   1154.00% [5]   10.73% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 147.5 [2],[3]   $ 147.5 [2],[3]   $ 148.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 146.0 [2],[3]   $ 146.0 [2],[3]   $ 145.6 [6],[7]                
Investment, Identifier [Axis]: DecoPac, Inc. and KCAKE Holdings Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.73% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 5.7 [2],[3]   $ 5.7 [2],[3]   $ 6.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.6 [2],[3]   5.6 [2],[3]   6.5 [6],[7]                
Investment, Identifier [Axis]: Denali Holdco LLC and Denali Apexco LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 11.4   11.4   11.4                
Less: funded commitments (2.9)   (2.9)   0.0                
Total unfunded commitments 8.5   8.5   11.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 8.5   8.5   11.4                
Investment, Identifier [Axis]: Denali Holdco LLC and Denali Apexco LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.4 [3]   $ 2.4 [3]   $ 2.4 [7]                
Investment, Identifier [Axis]: Denali Holdco LLC and Denali Apexco LP, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1156.00% [5]   1156.00% [5]   10.52% [1] 1156.00% [5] 1156.00% [5] 1156.00% [5] 1156.00% [5] 10.52% [1] 10.52% [1] 10.52% [1] 10.52% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Denali Holdco LLC and Denali Apexco LP, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1156.00% [5]   1156.00% [5]   10.52% [1] 1156.00% [5] 1156.00% [5] 1156.00% [5] 1156.00% [5] 10.52% [1] 10.52% [1] 10.52% [1] 10.52% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Denali Holdco LLC and Denali Apexco LP, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1105.00%   1105.00%     1105.00% 1105.00% 1105.00% 1105.00%        
Total first lien senior secured loans [2],[3] $ 1.8   $ 1.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.8   $ 1.8                    
Investment, Identifier [Axis]: Denali Holdco LLC and Denali Apexco LP, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1350.00%   1350.00%     1350.00% 1350.00% 1350.00% 1350.00%        
Total first lien senior secured loans [2],[3] $ 1.1   $ 1.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.1   1.1                    
Investment, Identifier [Axis]: Diligent Corporation and Diligent Preferred Issuer, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.2   2.2   2.2                
Less: funded commitments (1.0)   (1.0)   (0.7)                
Total unfunded commitments 1.2   1.2   1.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.2   $ 1.2   $ 1.5                
Investment, Identifier [Axis]: Diligent Corporation and Diligent Preferred Issuer, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1177.00% [5]   1177.00% [5]   10.63% [1] 1177.00% [5] 1177.00% [5] 1177.00% [5] 1177.00% [5] 10.63% [1] 10.63% [1] 10.63% [1] 10.63% [1]
Total first lien senior secured loans $ 14.7 [2],[3]   $ 14.7 [2],[3]   $ 35.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 14.7 [2],[3]   $ 14.7 [2],[3]   $ 35.2 [6],[7]                
Investment, Identifier [Axis]: Diligent Corporation and Diligent Preferred Issuer, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1127.00% [5]   1127.00% [5]   10.63% [1] 1127.00% [5] 1127.00% [5] 1127.00% [5] 1127.00% [5] 10.63% [1] 10.63% [1] 10.63% [1] 10.63% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 2.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 2.0 [6],[7]                
Investment, Identifier [Axis]: Diligent Corporation and Diligent Preferred Issuer, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1127.00% [5]   1127.00% [5]   10.13% [1] 1127.00% [5] 1127.00% [5] 1127.00% [5] 1127.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Diligent Corporation and Diligent Preferred Issuer, Inc., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1177.00% [5]   1177.00% [5]   10.13% [1] 1177.00% [5] 1177.00% [5] 1177.00% [5] 1177.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Diligent Corporation and Diligent Preferred Issuer, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1177.00% [5]   1177.00% [5]   10.63% [1] 1177.00% [5] 1177.00% [5] 1177.00% [5] 1177.00% [5] 10.63% [1] 10.63% [1] 10.63% [1] 10.63% [1]
Total first lien senior secured loans $ 0.9 [2],[3]   $ 0.9 [2],[3]   $ 0.7 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.9 [2],[3]   0.9 [2],[3]   0.7 [6],[7],[14]                
Investment, Identifier [Axis]: Diligent Corporation and Diligent Preferred Issuer, Inc., Preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 15.5 [3]   15.5 [3]   13.8 [7]                
Investment, Identifier [Axis]: Display Holding Company, Inc., Saldon Holdings, Inc. and Fastsigns Holdings Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.3   2.3   2.3                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.3   2.3   2.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.3   2.3   2.3                
Investment, Identifier [Axis]: Display Holding Company, Inc., Saldon Holdings, Inc. and Fastsigns Holdings Inc., Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.4 [3]   $ 1.4 [3]   $ 1.2 [7]                
Investment, Identifier [Axis]: Display Holding Company, Inc., Saldon Holdings, Inc. and Fastsigns Holdings Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1107.00% [5]   1107.00% [5]   10.03% [1] 1107.00% [5] 1107.00% [5] 1107.00% [5] 1107.00% [5] 10.03% [1] 10.03% [1] 10.03% [1] 10.03% [1]
Total first lien senior secured loans $ 15.6 [2],[3]   $ 15.6 [2],[3]   $ 15.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 15.6 [2],[3]   $ 15.6 [2],[3]   $ 15.8 [6],[7]                
Investment, Identifier [Axis]: Display Holding Company, Inc., Saldon Holdings, Inc. and Fastsigns Holdings Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1107.00% [5]   1107.00% [5]   10.03% [1] 1107.00% [5] 1107.00% [5] 1107.00% [5] 1107.00% [5] 10.03% [1] 10.03% [1] 10.03% [1] 10.03% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Display Holding Company, Inc., Saldon Holdings, Inc. and Fastsigns Holdings Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1107.00% [5]   1107.00% [5]   10.03% [1] 1107.00% [5] 1107.00% [5] 1107.00% [5] 1107.00% [5] 10.03% [1] 10.03% [1] 10.03% [1] 10.03% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Drilling Info Holdings, Inc. and Titan DI Preferred Holdings, Inc., Preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 46.9 [3]   $ 46.9 [3]   $ 41.6 [7]                
Investment, Identifier [Axis]: Drilling Info Holdings, Inc. and Titan DI Preferred Holdings, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1367.00% [5]   1367.00% [5]   12.63% [1] 1367.00% [5] 1367.00% [5] 1367.00% [5] 1367.00% [5] 12.63% [1] 12.63% [1] 12.63% [1] 12.63% [1]
Total first lien senior secured loans $ 25.0 [3]   $ 25.0 [3]   $ 25.0 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 25.0 [3]   25.0 [3]   24.8 [7]                
Investment, Identifier [Axis]: Dye & Durham Corporation                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.7   10.7   18.2                
Less: funded commitments (3.7)   (3.7)   (5.0)                
Total unfunded commitments 7.0   7.0   13.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 7.0   $ 7.0   $ 13.2                
Investment, Identifier [Axis]: Dye & Durham Corporation, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1124.00% [5]   1124.00% [5]   10.69% [1] 1124.00% [5] 1124.00% [5] 1124.00% [5] 1124.00% [5] 10.69% [1] 10.69% [1] 10.69% [1] 10.69% [1]
Total first lien senior secured loans $ 7.2 [2],[3],[4]   $ 7.2 [2],[3],[4]   $ 40.0 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.2 [2],[3],[4]   $ 7.2 [2],[3],[4]   $ 40.0 [6],[7],[8]                
Investment, Identifier [Axis]: Dye & Durham Corporation, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1126.00% [5]   1126.00% [5]   11.20% [1] 1126.00% [5] 1126.00% [5] 1126.00% [5] 1126.00% [5] 11.20% [1] 11.20% [1] 11.20% [1] 11.20% [1]
Total first lien senior secured loans $ 3.7 [2],[3],[4]   $ 3.7 [2],[3],[4]   $ 5.0 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.7 [2],[3],[4]   3.7 [2],[3],[4]   5.0 [6],[7],[8]                
Investment, Identifier [Axis]: Dynamic NC Aerospace Holdings, LLC and Dynamic NC Investment Holdings, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.1   7.1   7.1                
Less: funded commitments (1.7)   (1.7)   0.0                
Total unfunded commitments 5.4   5.4   7.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 5.4   5.4   7.1                
Investment, Identifier [Axis]: Dynamic NC Aerospace Holdings, LLC and Dynamic NC Investment Holdings, LP, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.1   $ 10.1   $ 9.0                
Investment, Identifier [Axis]: Dynamic NC Aerospace Holdings, LLC and Dynamic NC Investment Holdings, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1240.00% [5]   1240.00% [5]   11.65% [1] 1240.00% [5] 1240.00% [5] 1240.00% [5] 1240.00% [5] 11.65% [1] 11.65% [1] 11.65% [1] 11.65% [1]
Total first lien senior secured loans $ 21.7 [2],[3]   $ 21.7 [2],[3]   $ 23.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 21.7 [2],[3]   $ 21.7 [2],[3]   23.2 [6],[7]                
Investment, Identifier [Axis]: Dynamic NC Aerospace Holdings, LLC and Dynamic NC Investment Holdings, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1245.00%   1245.00%     1245.00% 1245.00% 1245.00% 1245.00%        
Total first lien senior secured loans [2],[3] $ 1.7   $ 1.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.7   $ 1.7                    
Investment, Identifier [Axis]: EP Purchaser, LLC and TPG VIII EP Co-Invest II, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1015.00%   1015.00%     1015.00% 1015.00% 1015.00% 1015.00%        
Total first lien senior secured loans [2],[3] $ 8.4   $ 8.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 8.3   8.3                    
Investment, Identifier [Axis]: EP Purchaser, LLC and TPG VIII EP Co-Invest II, L.P., Partnership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 11.6 [3],[4]   $ 11.6 [3],[4]   $ 11.7 [7],[8]                
Investment, Identifier [Axis]: EP Purchaser, LLC and TPG VIII EP Co-Invest II, L.P., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1193.00% [5]   1193.00% [5]   11.23% [1] 1193.00% [5] 1193.00% [5] 1193.00% [5] 1193.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 177.9 [2],[3]   $ 177.9 [2],[3]   $ 177.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 169.0 [2],[3]   169.0 [2],[3]   176.1 [6],[7]                
Investment, Identifier [Axis]: EP Wealth Advisors, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.8   9.8   14.1                
Less: funded commitments (0.4)   (0.4)   0.0                
Total unfunded commitments 9.4   9.4   14.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 9.4   $ 9.4   $ 14.1                
Investment, Identifier [Axis]: EP Wealth Advisors, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   10.01% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 10.01% [1] 10.01% [1] 10.01% [1] 10.01% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 5.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 5.6 [6],[7]                
Investment, Identifier [Axis]: EP Wealth Advisors, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   10.23% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.4 [6],[7]                
Investment, Identifier [Axis]: EP Wealth Advisors, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   10.23% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: EP Wealth Advisors, LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.11% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.11% [1] 10.11% [1] 10.11% [1] 10.11% [1]
Total first lien senior secured loans $ 4.2 [2],[3]   $ 4.2 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.2 [2],[3]   $ 4.2 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: EP Wealth Advisors, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1074.00%   1074.00%     1074.00% 1074.00% 1074.00% 1074.00%        
Total first lien senior secured loans [2],[3] $ 0.4   $ 0.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.4   0.4                    
Investment, Identifier [Axis]: EPS NASS Parent, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.4   1.4   1.5                
Less: funded commitments (1.2)   (1.2)   (0.8)                
Total unfunded commitments 0.2   0.2   0.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.2   $ 0.2   $ 0.7                
Investment, Identifier [Axis]: EPS NASS Parent, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.48% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investment, Identifier [Axis]: EPS NASS Parent, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.48% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 1.2 [2],[3]   $ 1.2 [2],[3]   $ 0.8 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.2 [2],[3]   1.2 [2],[3]   0.8 [6],[7],[14]                
Investment, Identifier [Axis]: ESCP PPG Holdings, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   2.3                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     2.3   (1.9)                
Fair Value 5.5   5.5   3.1                
Investment, Identifier [Axis]: ESCP PPG Holdings, LLC, Class A-1 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.5 [3]   5.5 [3]   3.0 [7]                
Investment, Identifier [Axis]: ESCP PPG Holdings, LLC, Class A-2 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.1 [7]                
Investment, Identifier [Axis]: ESHA Research, LLC and RMCF VI CIV XLVIII, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.1   1.1   1.1                
Less: funded commitments (0.4)   (0.4)   0.0                
Total unfunded commitments 0.7   0.7   1.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.7   $ 0.7   $ 1.1                
Investment, Identifier [Axis]: ESHA Research, LLC and RMCF VI CIV XLVIII, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1116.00% [5]   1116.00% [5]   10.07% [1] 1116.00% [5] 1116.00% [5] 1116.00% [5] 1116.00% [5] 10.07% [1] 10.07% [1] 10.07% [1] 10.07% [1]
Total first lien senior secured loans $ 6.8 [2],[3]   $ 6.8 [2],[3]   $ 6.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.8 [2],[3]   $ 6.8 [2],[3]   6.7 [6],[7]                
Investment, Identifier [Axis]: ESHA Research, LLC and RMCF VI CIV XLVIII, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1169.00%   1169.00%     1169.00% 1169.00% 1169.00% 1169.00%        
Total first lien senior secured loans [2],[3] $ 0.4   $ 0.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.4   0.4                    
Investment, Identifier [Axis]: ESHA Research, LLC and RMCF VI CIV XLVIII, L.P., Limited partner interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 7.9   7.9   6.0                
Investment, Identifier [Axis]: Eagle Football Holdings BidCo Limited and Eagle Football Holdings Limited, Ordinary shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[4] $ 4.3   $ 4.3                    
Investment, Identifier [Axis]: Eagle Football Holdings BidCo Limited and Eagle Football Holdings Limited, Senior subordinated loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 13.27%   13.27%     13.27% 13.27% 13.27% 13.27%        
Total first lien senior secured loans [2],[3],[4] $ 45.9   $ 45.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 43.6   43.6                    
Investment, Identifier [Axis]: Eagle Football Holdings BidCo Limited and Eagle Football Holdings Limited, Senior subordinated loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3],[4] 23.4   23.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[4] 23.2   23.2                    
Investment, Identifier [Axis]: Eagle Football Holdings BidCo Limited and Eagle Football Holdings Limited, Senior subordinated loan 3                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3],[4] 0.5   0.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[4] 0.5   0.5                    
Investment, Identifier [Axis]: Eagle Football Holdings BidCo Limited and Eagle Football Holdings Limited, Warrant to purchase shares of ordinary shares 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[4] 3.3   3.3                    
Investment, Identifier [Axis]: Eagle Football Holdings BidCo Limited and Eagle Football Holdings Limited, Warrant to purchase shares of ordinary shares 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[4] 0.6   0.6                    
Investment, Identifier [Axis]: Eagle Football Holdings BidCo Limited, Senior subordinated loan 1                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7],[8]         25.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[8]         $ 23.9                
Investment, Identifier [Axis]: Eagle Football Holdings BidCo Limited, Senior subordinated loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.30%         12.30% 12.30% 12.30% 12.30%
Total first lien senior secured loans [7],[8]         $ 41.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[8]         40.5                
Investment, Identifier [Axis]: Eckler Industries, Inc. and Eckler Purchaser LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   8.8                
Redemptions (cost)     0.0   57.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   (57.0)                
Net unrealized gains (losses):     0.0   25.1                
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: Eckler Purchaser LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: Elemica Parent, Inc. & EZ Elemica Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.1   4.1   4.1                
Less: funded commitments (4.1)   (4.1)   (4.1)                
Total unfunded commitments 0.0   0.0   0.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.0   $ 0.0   $ 0.0                
Investment, Identifier [Axis]: Elemica Parent, Inc. & EZ Elemica Holdings, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 11.09% [5]   11.09% [5]   10.74% [1] 11.09% [5] 11.09% [5] 11.09% [5] 11.09% [5] 10.74% [1] 10.74% [1] 10.74% [1] 10.74% [1]
Total first lien senior secured loans $ 49.6 [2],[3]   $ 49.6 [2],[3]   $ 50.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 48.2 [2],[3]   $ 48.2 [2],[3]   $ 48.5 [6],[7]                
Investment, Identifier [Axis]: Elemica Parent, Inc. & EZ Elemica Holdings, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1054.00% [5]   1054.00% [5]   10.68% [1] 1054.00% [5] 1054.00% [5] 1054.00% [5] 1054.00% [5] 10.68% [1] 10.68% [1] 10.68% [1] 10.68% [1]
Total first lien senior secured loans $ 11.2 [2],[3]   $ 11.2 [2],[3]   $ 11.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.9 [2],[3]   $ 10.9 [2],[3]   $ 11.0 [6],[7]                
Investment, Identifier [Axis]: Elemica Parent, Inc. & EZ Elemica Holdings, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1055.00% [5]   1055.00% [5]   10.68% [1] 1055.00% [5] 1055.00% [5] 1055.00% [5] 1055.00% [5] 10.68% [1] 10.68% [1] 10.68% [1] 10.68% [1]
Total first lien senior secured loans $ 5.7 [2],[3]   $ 5.7 [2],[3]   $ 5.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.5 [2],[3]   $ 5.5 [2],[3]   $ 5.6 [6],[7]                
Investment, Identifier [Axis]: Elemica Parent, Inc. & EZ Elemica Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1088.00% [5]   1088.00% [5]   10.51% [1] 1088.00% [5] 1088.00% [5] 1088.00% [5] 1088.00% [5] 10.51% [1] 10.51% [1] 10.51% [1] 10.51% [1]
Total first lien senior secured loans $ 4.1 [2],[3]   $ 4.1 [2],[3]   $ 4.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.0 [2],[3]   4.0 [2],[3]   4.0 [6],[7]                
Investment, Identifier [Axis]: Elemica Parent, Inc. & EZ Elemica Holdings, Inc., Preferred equity                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 6.2 [3]   6.2 [3]   5.3 [7]                
Investment, Identifier [Axis]: Elevation Services Parent Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 17.1   17.1   17.1                
Less: funded commitments (2.7)   (2.7)   (1.5)                
Total unfunded commitments 14.4   14.4   15.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 14.4   $ 14.4   $ 15.6                
Investment, Identifier [Axis]: Elevation Services Parent Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1154.00% [5]   1154.00% [5]   10.86% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 10.86% [1] 10.86% [1] 10.86% [1] 10.86% [1]
Total first lien senior secured loans $ 10.1 [2],[3]   $ 10.1 [2],[3]   $ 10.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.8 [2],[3]   $ 9.8 [2],[3]   $ 10.0 [6],[7]                
Investment, Identifier [Axis]: Elevation Services Parent Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1152.00% [5]   1152.00% [5]   9.47% [1] 1152.00% [5] 1152.00% [5] 1152.00% [5] 1152.00% [5] 9.47% [1] 9.47% [1] 9.47% [1] 9.47% [1]
Total first lien senior secured loans $ 9.1 [2],[3]   $ 9.1 [2],[3]   $ 9.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.8 [2],[3]   $ 8.8 [2],[3]   $ 9.0 [6],[7]                
Investment, Identifier [Axis]: Elevation Services Parent Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1152.00% [5]   1152.00% [5]   10.36% [1] 1152.00% [5] 1152.00% [5] 1152.00% [5] 1152.00% [5] 10.36% [1] 10.36% [1] 10.36% [1] 10.36% [1]
Total first lien senior secured loans $ 2.6 [2],[3],[13]   $ 2.6 [2],[3],[13]   $ 1.4 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.5 [2],[3],[13]   2.5 [2],[3],[13]   1.4 [6],[7],[14]                
Investment, Identifier [Axis]: Emergency Communications Network, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.1   7.1   6.8                
Less: funded commitments (7.1)   (7.1)   (6.8)                
Total unfunded commitments 0.0   0.0   0.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.0   $ 0.0   $ 0.0                
Investment, Identifier [Axis]: Emergency Communications Network, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 14.12% [5]   14.12% [5]   11.84% [1] 14.12% [5] 14.12% [5] 14.12% [5] 14.12% [5] 11.84% [1] 11.84% [1] 11.84% [1] 11.84% [1]
Total first lien senior secured loans $ 50.4 [2],[3]   $ 50.4 [2],[3]   $ 48.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 45.4 [2],[3]   $ 45.4 [2],[3]   $ 43.6 [6],[7]                
Investment, Identifier [Axis]: Emergency Communications Network, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon 13.66% [5]   13.66% [5]   12.15% [1] 13.66% [5] 13.66% [5] 13.66% [5] 13.66% [5] 12.15% [1] 12.15% [1] 12.15% [1] 12.15% [1]
Total first lien senior secured loans $ 7.1 [2],[3]   $ 7.1 [2],[3]   $ 6.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 6.4 [2],[3]   6.4 [2],[3]   $ 6.1 [6],[7]                
Investment, Identifier [Axis]: Ensemble RCM, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.19%         9.19% 9.19% 9.19% 9.19%
Total first lien senior secured loans [6],[7]         $ 2.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         2.5                
Investment, Identifier [Axis]: EpiServer Inc. and Episerver Sweden Holdings AB                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 14.5   14.5   14.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 14.5   14.5   14.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 14.5   $ 14.5   $ 14.5                
Investment, Identifier [Axis]: EpiServer Inc. and Episerver Sweden Holdings AB, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   6.69% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 6.69% [1] 6.69% [1] 6.69% [1] 6.69% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 5.6 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 5.5 [7],[8]                
Investment, Identifier [Axis]: EpiServer Inc. and Episerver Sweden Holdings AB, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 969.00% [5]   969.00% [5]   9.98% [1] 969.00% [5] 969.00% [5] 969.00% [5] 969.00% [5] 9.98% [1] 9.98% [1] 9.98% [1] 9.98% [1]
Total first lien senior secured loans $ 5.5 [3],[4]   $ 5.5 [3],[4]   $ 0.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.4 [3],[4]   $ 5.4 [3],[4]   $ 0.1 [6],[7],[8]                
Investment, Identifier [Axis]: EpiServer Inc. and Episerver Sweden Holdings AB, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   9.98% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 9.98% [1] 9.98% [1] 9.98% [1] 9.98% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3],[4]   0.1 [2],[3],[4]   0.1 [6],[7],[8]                
Investment, Identifier [Axis]: Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 28.0   28.0   28.0                
Less: funded commitments (8.8)   (8.8)   (6.2)                
Total unfunded commitments 19.2   19.2   21.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 19.2   19.2   21.8                
Investment, Identifier [Axis]: Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 43.3 [3]   $ 43.3 [3]   $ 42.0 [7],[16]                
Investment, Identifier [Axis]: Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1115.00% [5]   1115.00% [5]   9.49% [1] 1115.00% [5] 1115.00% [5] 1115.00% [5] 1115.00% [5] 9.49% [1] 9.49% [1] 9.49% [1] 9.49% [1]
Total first lien senior secured loans $ 47.8 [2],[3]   $ 47.8 [2],[3]   $ 78.1 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 47.4 [2],[3]   $ 47.4 [2],[3]   $ 76.5 [6],[7],[16]                
Investment, Identifier [Axis]: Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1115.00% [5]   1115.00% [5]   9.49% [1] 1115.00% [5] 1115.00% [5] 1115.00% [5] 1115.00% [5] 9.49% [1] 9.49% [1] 9.49% [1] 9.49% [1]
Total first lien senior secured loans $ 77.5 [2],[3]   $ 77.5 [2],[3]   $ 48.2 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 76.7 [2],[3]   $ 76.7 [2],[3]   $ 47.2 [6],[7],[16]                
Investment, Identifier [Axis]: Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1115.00% [5]   1115.00% [5]   9.71% [1] 1115.00% [5] 1115.00% [5] 1115.00% [5] 1115.00% [5] 9.71% [1] 9.71% [1] 9.71% [1] 9.71% [1]
Total first lien senior secured loans $ 25.0 [2],[3]   $ 25.0 [2],[3]   $ 19.6 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 24.8 [2],[3]   $ 24.8 [2],[3]   $ 19.2 [6],[7],[16]                
Investment, Identifier [Axis]: Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         14.94%         14.94% 14.94% 14.94% 14.94%
Total first lien senior secured loans [6],[7],[16]         $ 5.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         5.5                
Investment, Identifier [Axis]: Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5]              
Total first lien senior secured loans $ 0.0 [17]   $ 0.0 [17]   0.0 [15],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   0.0 [15],[16]                
Investment, Identifier [Axis]: Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 2.7   2.7                    
Investment, Identifier [Axis]: European Capital UK SME Debt LP                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     9.8   0.8                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     7.0   2.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (1.0)   0.4                
Fair Value 15.7   15.7   26.5                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 54.9   54.9   54.3                
Less: funded commitments (49.7)   (49.7)   (49.1)                
Total unfunded commitments 5.2   5.2   5.2                
Less: commitments substantially at discretion of the Company 5.2   5.2   5.2                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0   0.0                
Investment, Identifier [Axis]: European Capital UK SME Debt LP, Limited partnership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 15.7 [4]   15.7 [4]   26.5 [8]                
Investment, Identifier [Axis]: Everspin Technologies, Inc., Warrant to purchase shares of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0   $ 0.0   $ 0.0                
Investment, Identifier [Axis]: Evolent Health LLC and Evolent Health, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1154.00%   1154.00%     1154.00% 1154.00% 1154.00% 1154.00%        
Total first lien senior secured loans [2],[3],[4] $ 7.4   $ 7.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 7.4   $ 7.4                    
Investment, Identifier [Axis]: Evolent Health LLC and Evolent Health, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1154.00%   1154.00%     1154.00% 1154.00% 1154.00% 1154.00%        
Total first lien senior secured loans [2],[3],[4] $ 14.0   $ 14.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 14.0   $ 14.0                    
Investment, Identifier [Axis]: Evolent Health LLC and Evolent Health, Inc., Series A preferred shares                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1140.00%   1140.00%     1140.00% 1140.00% 1140.00% 1140.00%        
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 4.3   $ 4.3                    
Investment, Identifier [Axis]: Evolent Health LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.23%         10.23% 10.23% 10.23% 10.23%
Total first lien senior secured loans [6],[7],[8]         $ 7.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         $ 7.7                
Investment, Identifier [Axis]: Excel Fitness Consolidator LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.8   1.8                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.8   1.8                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.8   $ 1.8                    
Investment, Identifier [Axis]: Excel Fitness Consolidator LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 1089.00%   1089.00%     1089.00% 1089.00% 1089.00% 1089.00%        
Total first lien senior secured loans [2],[3] $ 3.6   $ 3.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 3.6   $ 3.6                    
Investment, Identifier [Axis]: Excelligence Holdings Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1154.00% [5]   1154.00% [5]   10.73% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 9.1 [2],[3]   $ 9.1 [2],[3]   $ 9.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 9.1 [2],[3]   9.1 [2],[3]   9.2 [6],[7]                
Investment, Identifier [Axis]: Explorer Investor, Inc                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.2                
Less: funded commitments         0.0                
Total unfunded commitments         0.2                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.2                
Investment, Identifier [Axis]: Explorer Investor, Inc, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.15%         10.15% 10.15% 10.15% 10.15%
Total first lien senior secured loans [6],[7]         $ 1.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.9                
Investment, Identifier [Axis]: Extrahop Networks, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 11.7   11.7   5.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 11.7   11.7   5.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 11.7   $ 11.7   $ 5.9                
Investment, Identifier [Axis]: Extrahop Networks, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.23%         12.23% 12.23% 12.23% 12.23%
Total first lien senior secured loans [6],[7]         $ 20.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         20.2                
Investment, Identifier [Axis]: Extrahop Networks, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1292.00%   1292.00%     1292.00% 1292.00% 1292.00% 1292.00%        
Total first lien senior secured loans [2],[3] $ 22.2   $ 22.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 22.2   $ 22.2                    
Investment, Identifier [Axis]: Extrahop Networks, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1292.00%   1292.00%     1292.00% 1292.00% 1292.00% 1292.00%        
Total first lien senior secured loans [2],[3] $ 3.9   $ 3.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 3.9   3.9                    
Investment, Identifier [Axis]: FL Hawk Intermediate Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.5   0.5   0.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.5   0.5   0.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.5   0.5   0.5                
Investment, Identifier [Axis]: FM:Systems Group, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         1.5                
Less: funded commitments         0.0                
Total unfunded commitments         1.5                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 1.5                
Investment, Identifier [Axis]: FM:Systems Group, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.13%         9.13% 9.13% 9.13% 9.13%
Total first lien senior secured loans [6],[7]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 0.1                
Investment, Identifier [Axis]: FM:Systems Group, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.96%         10.96% 10.96% 10.96% 10.96%
Total first lien senior secured loans [6],[7]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.1                
Investment, Identifier [Axis]: FS Squared Holding Corp. and FS Squared, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.5   9.5   9.6                
Less: funded commitments (1.9)   (1.9)   (0.5)                
Total unfunded commitments 7.6   7.6   9.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 7.6   7.6   9.1                
Investment, Identifier [Axis]: FS Squared Holding Corp. and FS Squared, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 33.9 [3]   $ 33.9 [3]   $ 31.2 [7]                
Investment, Identifier [Axis]: FS Squared Holding Corp. and FS Squared, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1067.00% [5]   1067.00% [5]   9.49% [1] 1067.00% [5] 1067.00% [5] 1067.00% [5] 1067.00% [5] 9.49% [1] 9.49% [1] 9.49% [1] 9.49% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: FS Squared Holding Corp. and FS Squared, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1067.00%   1067.00%     1067.00% 1067.00% 1067.00% 1067.00%        
Total first lien senior secured loans $ 1.4 [3],[13]   $ 1.4 [3],[13]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.4 [3],[13]   1.4 [3],[13]   0.0 [15]                
Investment, Identifier [Axis]: Faraday Buyer, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.1   1.1   4.7                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 1.1   1.1   4.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.1   $ 1.1   $ 4.7                
Investment, Identifier [Axis]: Faraday Buyer, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1237.00% [5]   1237.00% [5]   11.32% [1] 1237.00% [5] 1237.00% [5] 1237.00% [5] 1237.00% [5] 11.32% [1] 11.32% [1] 11.32% [1] 11.32% [1]
Total first lien senior secured loans $ 55.6 [2],[3]   $ 55.6 [2],[3]   $ 52.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 55.6 [2],[3]   55.6 [2],[3]   50.6 [6],[7]                
Investment, Identifier [Axis]: Faraday&Future Inc., FF Inc., Faraday SPE, LLC and Faraday Future Intelligent Electric Inc., Warrant to purchase shares of Class A common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0 [7]                
Investment, Identifier [Axis]: Ferrellgas, L.P. and Ferrellgas Partners, L.P., Class B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 12.6 [3]   $ 12.6 [3]   $ 14.9                
Investment, Identifier [Axis]: Ferrellgas, L.P. and Ferrellgas Partners, L.P., Senior preferred units                          
Schedule of Investments [Line Items]                          
Coupon | Rate 896.00% [5]   896.00% [5]   896.00% [1] 896.00% [5] 896.00% [5] 896.00% [5] 896.00% [5] 896.00% [1] 896.00% [1] 896.00% [1] 896.00% [1]
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 60.0   $ 60.0   $ 60.0                
Investment, Identifier [Axis]: Finastra USA, Inc., DH Corporation/Societe DH, and Finastra Europe S.A R.L.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 21.9   21.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 21.9   21.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 21.9   $ 21.9                    
Investment, Identifier [Axis]: Finastra USA, Inc., DH Corporation/Societe DH, and Finastra Europe S.A R.L., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1271.00%   1271.00%     1271.00% 1271.00% 1271.00% 1271.00%        
Total first lien senior secured loans [2],[3],[4] $ 190.5   $ 190.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 188.6   188.6                    
Investment, Identifier [Axis]: First Insight, Inc., Warrant to purchase shares of Series C preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0                    
Investment, Identifier [Axis]: First Insight, Inc., Warrant to purchase units of Series C preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: Flinn Scientific, Inc. and WCI-Quantum Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 14.5   14.5   14.5                
Less: funded commitments (6.1)   (6.1)   (7.1)                
Total unfunded commitments 8.4   8.4   7.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 8.4   $ 8.4   $ 7.4                
Investment, Identifier [Axis]: Flinn Scientific, Inc. and WCI-Quantum Holdings, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1115.00% [5]   1115.00% [5]   9.88% [1] 1115.00% [5] 1115.00% [5] 1115.00% [5] 1115.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 29.4 [2],[3]   $ 29.4 [2],[3]   $ 29.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 29.4 [2],[3]   $ 29.4 [2],[3]   $ 29.6 [6],[7]                
Investment, Identifier [Axis]: Flinn Scientific, Inc. and WCI-Quantum Holdings, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1115.00% [5]   1115.00% [5]   9.88% [1] 1115.00% [5] 1115.00% [5] 1115.00% [5] 1115.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 1.1 [2],[3]   $ 1.1 [2],[3]   $ 1.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.1 [2],[3]   $ 1.1 [2],[3]   $ 1.1 [6],[7]                
Investment, Identifier [Axis]: Flinn Scientific, Inc. and WCI-Quantum Holdings, Inc., First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1093.00% [5]   1093.00% [5]   9.88% [1] 1093.00% [5] 1093.00% [5] 1093.00% [5] 1093.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 5.4 [2],[3],[13]   $ 5.4 [2],[3],[13]   $ 6.5 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.4 [2],[3],[13]   $ 5.4 [2],[3],[13]   $ 6.5 [6],[7],[14]                
Investment, Identifier [Axis]: Flinn Scientific, Inc. and WCI-Quantum Holdings, Inc., First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1300.00% [5]   1300.00% [5]   11.50% [1] 1300.00% [5] 1300.00% [5] 1300.00% [5] 1300.00% [5] 11.50% [1] 11.50% [1] 11.50% [1] 11.50% [1]
Total first lien senior secured loans $ 0.7 [2],[3],[13]   $ 0.7 [2],[3],[13]   $ 0.5 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.7 [2],[3],[13]   0.7 [2],[3],[13]   0.5 [6],[7],[14]                
Investment, Identifier [Axis]: Flinn Scientific, Inc. and WCI-Quantum Holdings, Inc., Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.4 [3]   1.4 [3]   $ 1.5 [7]                
Investment, Identifier [Axis]: Flint OpCo, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.1   4.1                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 4.1   4.1                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.1   $ 4.1                    
Investment, Identifier [Axis]: Flint OpCo, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 1067.00%   1067.00%     1067.00% 1067.00% 1067.00% 1067.00%        
Total first lien senior secured loans [2],[3] $ 5.0   $ 5.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 4.8   $ 4.8                    
Investment, Identifier [Axis]: Florida Food Products, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1043.00% [5]   1043.00% [5]   9.32% [1] 1043.00% [5] 1043.00% [5] 1043.00% [5] 1043.00% [5] 9.32% [1] 9.32% [1] 9.32% [1] 9.32% [1]
Total first lien senior secured loans $ 0.5 [2],[3]   $ 0.5 [2],[3]   $ 0.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 0.4 [6],[7]                
Investment, Identifier [Axis]: Florida Food Products, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1032.00% [5]   1032.00% [5]   9.38% [1] 1032.00% [5] 1032.00% [5] 1032.00% [5] 1032.00% [5] 9.38% [1] 9.38% [1] 9.38% [1] 9.38% [1]
Total first lien senior secured loans $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Florida Food Products, LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1343.00% [5]   1343.00% [5]   12.38% [1] 1343.00% [5] 1343.00% [5] 1343.00% [5] 1343.00% [5] 12.38% [1] 12.38% [1] 12.38% [1] 12.38% [1]
Total first lien senior secured loans $ 71.8 [2],[3]   $ 71.8 [2],[3]   $ 71.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 66.0 [2],[3]   66.0 [2],[3]   70.4 [6],[7]                
Investment, Identifier [Axis]: FlyWheel Acquireco, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.2   8.2                    
Less: funded commitments (5.5)   (5.5)                    
Total unfunded commitments 2.7   2.7                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.7   $ 2.7                    
Investment, Identifier [Axis]: FlyWheel Acquireco, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1183.00%   1183.00%     1183.00% 1183.00% 1183.00% 1183.00%        
Total first lien senior secured loans [2],[3] $ 52.6   $ 52.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 51.6   $ 51.6                    
Investment, Identifier [Axis]: FlyWheel Acquireco, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1183.00%   1183.00%     1183.00% 1183.00% 1183.00% 1183.00%        
Total first lien senior secured loans [2],[3] $ 5.5   $ 5.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 5.4   5.4                    
Investment, Identifier [Axis]: Forescout Technologies, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 16.0   16.0   14.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 16.0   16.0   14.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 16.0   $ 16.0   $ 14.2                
Investment, Identifier [Axis]: Forescout Technologies, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 14.49% [5]   14.49% [5]   14.23% [1] 14.49% [5] 14.49% [5] 14.49% [5] 14.49% [5] 14.23% [1] 14.23% [1] 14.23% [1] 14.23% [1]
Total first lien senior secured loans $ 9.4 [2],[3]   $ 9.4 [2],[3]   $ 23.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.4 [2],[3]   $ 9.4 [2],[3]   23.8 [6],[7]                
Investment, Identifier [Axis]: Forescout Technologies, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 14.49%   14.49%     14.49% 14.49% 14.49% 14.49%        
Total first lien senior secured loans $ 13.5 [2],[3]   $ 13.5 [2],[3]   12.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 13.5 [2],[3]   $ 13.5 [2],[3]   $ 12.6 [6],[7]                
Investment, Identifier [Axis]: Foundation Consumer Brands, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.15%         10.15% 10.15% 10.15% 10.15%
Total first lien senior secured loans [6],[7]         $ 12.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         12.8                
Investment, Identifier [Axis]: Foundation Consumer Brands, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1177.00%   1177.00%     1177.00% 1177.00% 1177.00% 1177.00%        
Total first lien senior secured loans [2],[3] $ 13.4   $ 13.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 13.4   $ 13.4                    
Investment, Identifier [Axis]: Foundation Consumer Brands, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1179.00%   1179.00%     1179.00% 1179.00% 1179.00% 1179.00%        
Total first lien senior secured loans [2],[3] $ 15.4   $ 15.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 15.4   15.4                    
Investment, Identifier [Axis]: Foundation Risk Partners, Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 34.4   34.4   40.5                
Less: funded commitments 0.0   0.0   (8.6)                
Total unfunded commitments 34.4   34.4   31.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 34.4   $ 34.4   $ 31.9                
Investment, Identifier [Axis]: Foundation Risk Partners, Corp., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1149.00% [5]   1149.00% [5]   10.68% [1] 1149.00% [5] 1149.00% [5] 1149.00% [5] 1149.00% [5] 10.68% [1] 10.68% [1] 10.68% [1] 10.68% [1]
Total first lien senior secured loans $ 103.9 [2]   $ 103.9 [2]   $ 112.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 103.9 [2]   $ 103.9 [2]   $ 111.5 [6],[7]                
Investment, Identifier [Axis]: Foundation Risk Partners, Corp., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1149.00% [5]   1149.00% [5]   10.68% [1] 1149.00% [5] 1149.00% [5] 1149.00% [5] 1149.00% [5] 10.68% [1] 10.68% [1] 10.68% [1] 10.68% [1]
Total first lien senior secured loans $ 36.2 [2],[3]   $ 36.2 [2],[3]   $ 30.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 36.2 [2],[3]   36.2 [2],[3]   $ 30.0 [6],[7]                
Investment, Identifier [Axis]: Foundation Risk Partners, Corp., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.68%         10.68% 10.68% 10.68% 10.68%
Total first lien senior secured loans [6],[7]         $ 1.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 1.1                
Investment, Identifier [Axis]: Foundation Risk Partners, Corp., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.32%         10.32% 10.32% 10.32% 10.32%
Total first lien senior secured loans [6],[7]         $ 8.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         8.5                
Investment, Identifier [Axis]: GC Waves Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.1   0.1                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.1   0.1                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 0.1   0.1                    
Investment, Identifier [Axis]: GF Parent LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: GF Parent LLC, Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: GF Parent LLC, Class B common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: GHX Ultimate Parent Corporation, Commerce Parent, Inc. and Commerce Topco, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         47.5                
Less: funded commitments         0.0                
Total unfunded commitments         47.5                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         47.5                
Investment, Identifier [Axis]: GHX Ultimate Parent Corporation, Commerce Parent, Inc. and Commerce Topco, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 30.2 [3]   $ 30.2 [3]   $ 27.8 [7]                
Investment, Identifier [Axis]: GHX Ultimate Parent Corporation, Commerce Parent, Inc. and Commerce Topco, LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1229.00% [5]   1229.00% [5]   11.48% [1] 1229.00% [5] 1229.00% [5] 1229.00% [5] 1229.00% [5] 11.48% [1] 11.48% [1] 11.48% [1] 11.48% [1]
Total first lien senior secured loans $ 114.0 [2],[3]   $ 114.0 [2],[3]   $ 114.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 112.9 [2],[3]   112.9 [2],[3]   111.8 [6],[7]                
Investment, Identifier [Axis]: GI Ranger Intermediate LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.2   9.2   9.2                
Less: funded commitments (1.4)   (1.4)   (0.4)                
Total unfunded commitments 7.8   7.8   8.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 7.8   $ 7.8   $ 8.8                
Investment, Identifier [Axis]: GI Ranger Intermediate LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.73% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 10.1 [2],[3]   $ 10.1 [2],[3]   $ 10.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.0 [2],[3]   $ 10.0 [2],[3]   $ 10.0 [6],[7]                
Investment, Identifier [Axis]: GI Ranger Intermediate LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.73% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 1.8 [2],[3]   $ 1.8 [2],[3]   $ 1.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.7 [2],[3]   $ 1.7 [2],[3]   $ 1.7 [6],[7]                
Investment, Identifier [Axis]: GI Ranger Intermediate LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.73% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 1.4 [2],[3]   $ 1.4 [2],[3]   $ 0.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.4 [2],[3]   1.4 [2],[3]   0.4 [6],[7]                
Investment, Identifier [Axis]: GNZ Energy Bidco Limited and Galileo Co-investment Trust I                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.0   3.0   3.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.0   3.0   3.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 3.0   3.0   3.1                
Investment, Identifier [Axis]: GNZ Energy Bidco Limited and Galileo Co-investment Trust I, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 13.4 [3],[4]   $ 13.4 [3],[4]   $ 8.7 [7],[8]                
Investment, Identifier [Axis]: GNZ Energy Bidco Limited and Galileo Co-investment Trust I, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1247.00% [5]   1247.00% [5]   10.65% [1] 1247.00% [5] 1247.00% [5] 1247.00% [5] 1247.00% [5] 10.65% [1] 10.65% [1] 10.65% [1] 10.65% [1]
Total first lien senior secured loans $ 29.2 [2],[3],[4]   $ 29.2 [2],[3],[4]   $ 30.8 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 29.2 [2],[3],[4]   29.2 [2],[3],[4]   30.8 [6],[7],[8]                
Investment, Identifier [Axis]: GPM Investments, LLC and ARKO Corp., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 14.9 [10]   14.9 [10]   26.1                
Investment, Identifier [Axis]: GPM Investments, LLC and ARKO Corp., Warrant to purchase common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[10] 1.2   1.2                    
Investment, Identifier [Axis]: GPM Investments, LLC and ARKO Corp., Warrant to purchase units of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         1.9                
Investment, Identifier [Axis]: GS SEER Group Borrower LLC and GS SEER Group Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.9   10.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 10.9   10.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 10.9   10.9                    
Investment, Identifier [Axis]: GS SEER Group Borrower LLC and GS SEER Group Holdings LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 4.4   $ 4.4                    
Investment, Identifier [Axis]: GS SEER Group Borrower LLC and GS SEER Group Holdings LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1214.00%   1214.00%     1214.00% 1214.00% 1214.00% 1214.00%        
Total first lien senior secured loans [2],[3] $ 18.2   $ 18.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 17.7   17.7                    
Investment, Identifier [Axis]: GSV PracticeTek Holdings, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         14.0                
Investment, Identifier [Axis]: GTCR F Buyer Corp. and GTCR (D) Investors LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.6   1.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.6   1.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.6   $ 1.6                    
Investment, Identifier [Axis]: GTCR F Buyer Corp. and GTCR (D) Investors LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 1140.00%   1140.00%     1140.00% 1140.00% 1140.00% 1140.00%        
Total first lien senior secured loans [2],[3] $ 4.3   $ 4.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 4.2   4.2                    
Investment, Identifier [Axis]: GTCR F Buyer Corp. and GTCR (D) Investors LP, Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 4.6   4.6                    
Investment, Identifier [Axis]: Galway Borrower LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.8   8.8   9.8                
Less: funded commitments (0.4)   (0.4)   (0.4)                
Total unfunded commitments 8.4   8.4   9.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 8.4   $ 8.4   $ 9.4                
Investment, Identifier [Axis]: Galway Borrower LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1064.00% [5]   1064.00% [5]   9.98% [1] 1064.00% [5] 1064.00% [5] 1064.00% [5] 1064.00% [5] 9.98% [1] 9.98% [1] 9.98% [1] 9.98% [1]
Total first lien senior secured loans $ 34.9 [2],[3]   $ 34.9 [2],[3]   $ 34.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 34.2 [2],[3]   34.2 [2],[3]   32.8 [6],[7]                
Investment, Identifier [Axis]: Galway Borrower LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [2],[3]   0.0 [2],[3]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [2],[3]   0.0 [2],[3]   0.0 [15]                
Investment, Identifier [Axis]: Genesis Acquisition Co. and Genesis Ultimate Holding Co.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.5   1.5   1.5                
Less: funded commitments (1.5)   (1.5)   (1.5)                
Total unfunded commitments 0.0   0.0   0.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0   0.0                
Investment, Identifier [Axis]: Genesis Acquisition Co. and Genesis Ultimate Holding Co., Class A common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.8 [3]   $ 1.8 [3]   $ 1.4 [7]                
Investment, Identifier [Axis]: Genesis Acquisition Co. and Genesis Ultimate Holding Co., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1039.00% [5]   1039.00% [5]   7.92% [1] 1039.00% [5] 1039.00% [5] 1039.00% [5] 1039.00% [5] 7.92% [1] 7.92% [1] 7.92% [1] 7.92% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [7]                
Investment, Identifier [Axis]: Genesis Acquisition Co. and Genesis Ultimate Holding Co., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1039.00% [5]   1039.00% [5]   8.42% [1] 1039.00% [5] 1039.00% [5] 1039.00% [5] 1039.00% [5] 8.42% [1] 8.42% [1] 8.42% [1] 8.42% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Genesis Acquisition Co. and Genesis Ultimate Holding Co., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1039.00% [5]   1039.00% [5]   7.92% [1] 1039.00% [5] 1039.00% [5] 1039.00% [5] 1039.00% [5] 7.92% [1] 7.92% [1] 7.92% [1] 7.92% [1]
Total first lien senior secured loans $ 1.5 [2],[3]   $ 1.5 [2],[3]   $ 1.5 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.5 [2],[3]   $ 1.5 [2],[3]   $ 1.5 [7]                
Investment, Identifier [Axis]: Genesis Acquisition Co. and Genesis Ultimate Holding Co., Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1447.00% [5]   1447.00% [5]   11.24% [1] 1447.00% [5] 1447.00% [5] 1447.00% [5] 1447.00% [5] 11.24% [1] 11.24% [1] 11.24% [1] 11.24% [1]
Total first lien senior secured loans $ 32.4 [2],[3]   $ 32.4 [2],[3]   $ 32.4 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 32.4 [2],[3]   $ 32.4 [2],[3]   $ 31.7 [7]                
Investment, Identifier [Axis]: Genesis Acquisition Co. and Genesis Ultimate Holding Co., Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1447.00% [5]   1447.00% [5]   11.24% [1] 1447.00% [5] 1447.00% [5] 1447.00% [5] 1447.00% [5] 11.24% [1] 11.24% [1] 11.24% [1] 11.24% [1]
Total first lien senior secured loans $ 7.5 [2],[3]   $ 7.5 [2],[3]   $ 21.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.5 [2],[3]   $ 7.5 [2],[3]   $ 20.7 [6],[7]                
Investment, Identifier [Axis]: Genesis Acquisition Co. and Genesis Ultimate Holding Co., Second lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1447.00% [5]   1447.00% [5]   11.24% [1] 1447.00% [5] 1447.00% [5] 1447.00% [5] 1447.00% [5] 11.24% [1] 11.24% [1] 11.24% [1] 11.24% [1]
Total first lien senior secured loans $ 21.1 [2],[3]   $ 21.1 [2],[3]   $ 7.5 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 21.1 [2],[3]   $ 21.1 [2],[3]   7.4 [7]                
Investment, Identifier [Axis]: Genomatica, Inc., Warrant to purchase shares of Series D preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         $ 0.0                
Investment, Identifier [Axis]: Global Medical Response, Inc. and GMR Buyer Corp., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 978.00% [5]   978.00% [5]   8.63% [1] 978.00% [5] 978.00% [5] 978.00% [5] 978.00% [5] 8.63% [1] 8.63% [1] 8.63% [1] 8.63% [1]
Total first lien senior secured loans $ 28.8 [2],[3],[10]   $ 28.8 [2],[3],[10]   $ 12.1 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 20.0 [2],[3],[10]   $ 20.0 [2],[3],[10]   $ 8.5 [6],[7],[11]                
Investment, Identifier [Axis]: Global Medical Response, Inc. and GMR Buyer Corp., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 988.00% [5]   988.00% [5]   8.42% [1] 988.00% [5] 988.00% [5] 988.00% [5] 988.00% [5] 8.42% [1] 8.42% [1] 8.42% [1] 8.42% [1]
Total first lien senior secured loans $ 12.4 [2],[3],[10]   $ 12.4 [2],[3],[10]   $ 25.7 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.6 [2],[3],[10]   $ 8.6 [2],[3],[10]   $ 17.9 [6],[7],[11]                
Investment, Identifier [Axis]: Global Medical Response, Inc. and GMR Buyer Corp., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1217.00% [5]   1217.00% [5]   11.10% [1] 1217.00% [5] 1217.00% [5] 1217.00% [5] 1217.00% [5] 11.10% [1] 11.10% [1] 11.10% [1] 11.10% [1]
Total first lien senior secured loans $ 95.4 [2],[3]   $ 95.4 [2],[3]   $ 95.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 67.8 [2],[3]   67.8 [2],[3]   71.6 [6],[7]                
Investment, Identifier [Axis]: Global Medical Response, Inc. and GMR Buyer Corp., Warrant to purchase units of common stock 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.6 [3]   0.6 [3]   1.8 [7]                
Investment, Identifier [Axis]: Global Medical Response, Inc. and GMR Buyer Corp., Warrant to purchase units of common stock 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0 [7]                
Investment, Identifier [Axis]: Global Music Rights, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.3   4.3   4.3                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.3   4.3   4.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.3   $ 4.3   $ 4.3                
Investment, Identifier [Axis]: Global Music Rights, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1124.00% [5]   1124.00% [5]   10.23% [1] 1124.00% [5] 1124.00% [5] 1124.00% [5] 1124.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Gotham Greens Holdings, PBC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 14.9   14.9   33.8                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 14.9   14.9   33.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions (12.9)   (12.9)   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.0   $ 2.0   $ 33.8                
Investment, Identifier [Axis]: Gotham Greens Holdings, PBC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 14.29% [5]   14.29% [5]   11.80% [1] 14.29% [5] 14.29% [5] 14.29% [5] 14.29% [5] 11.80% [1] 11.80% [1] 11.80% [1] 11.80% [1]
Total first lien senior secured loans $ 35.4 [2],[3]   $ 35.4 [2],[3]   $ 17.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 34.8 [2],[3]   34.8 [2],[3]   17.4 [6],[7]                
Investment, Identifier [Axis]: Gotham Greens Holdings, PBC, Series E-1 preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         14.2                
Investment, Identifier [Axis]: Gotham Greens Holdings, PBC, Series E-1 preferred stock 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 14.2   14.2                    
Investment, Identifier [Axis]: Gotham Greens Holdings, PBC, Series E-1 preferred stock 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: Gotham Greens Holdings, PBC, Warrant to purchase shares of Series E-1 preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.6 [3]   0.6 [3]   0.0                
Investment, Identifier [Axis]: GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.0   5.0   5.0                
Less: funded commitments (0.6)   (0.6)   0.0                
Total unfunded commitments 4.4   4.4   5.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.4   $ 4.4   $ 5.0                
Investment, Identifier [Axis]: GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1172.00% [5]   1172.00% [5]   10.73% [1] 1172.00% [5] 1172.00% [5] 1172.00% [5] 1172.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investment, Identifier [Axis]: GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1087.00% [5]   1087.00% [5]   10.23% [1] 1087.00% [5] 1087.00% [5] 1087.00% [5] 1087.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1122.00% [5]   1122.00% [5]   10.23% [1] 1122.00% [5] 1122.00% [5] 1122.00% [5] 1122.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1122.00% [5]   1122.00% [5]   10.43% [1] 1122.00% [5] 1122.00% [5] 1122.00% [5] 1122.00% [5] 10.43% [1] 10.43% [1] 10.43% [1] 10.43% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1350.00%   1350.00%     1350.00% 1350.00% 1350.00% 1350.00%        
Total first lien senior secured loans [2],[3] $ 0.6   $ 0.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.6   0.6                    
Investment, Identifier [Axis]: GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 65.6   65.6   57.5                
Investment, Identifier [Axis]: GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 48.3 [3]   48.3 [3]   43.5 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 44.4 [3]   44.4 [3]   40.0 [7]                
Investment, Identifier [Axis]: GroundWorks, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.4   1.4                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.4   1.4                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.4   $ 1.4                    
Investment, Identifier [Axis]: GroundWorks, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1181.00%   1181.00%     1181.00% 1181.00% 1181.00% 1181.00%        
Total first lien senior secured loans [2],[3] $ 10.5   $ 10.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 10.5   10.5                    
Investment, Identifier [Axis]: H-Food Holdings, LLC and Matterhorn Parent, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.9   $ 3.9   $ 3.5                
Investment, Identifier [Axis]: H-Food Holdings, LLC and Matterhorn Parent, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1058.00% [5]   1058.00% [5]   8.07% [1] 1058.00% [5] 1058.00% [5] 1058.00% [5] 1058.00% [5] 8.07% [1] 8.07% [1] 8.07% [1] 8.07% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[10]   $ 0.1 [2],[3],[10]   $ 26.4 [7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3],[10]   $ 0.1 [2],[3],[10]   $ 23.3 [7],[11]                
Investment, Identifier [Axis]: H-Food Holdings, LLC and Matterhorn Parent, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 927.00% [5]   927.00% [5]   8.38% [1] 927.00% [5] 927.00% [5] 927.00% [5] 927.00% [5] 8.38% [1] 8.38% [1] 8.38% [1] 8.38% [1]
Total first lien senior secured loans $ 26.2 [3],[10]   $ 26.2 [3],[10]   $ 3.3 [7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 22.7 [3],[10]   $ 22.7 [3],[10]   $ 3.0 [7],[11]                
Investment, Identifier [Axis]: H-Food Holdings, LLC and Matterhorn Parent, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 958.00% [5]   958.00% [5]   9.38% [1] 958.00% [5] 958.00% [5] 958.00% [5] 958.00% [5] 9.38% [1] 9.38% [1] 9.38% [1] 9.38% [1]
Total first lien senior secured loans $ 3.3 [3],[10]   $ 3.3 [3],[10]   $ 0.1 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.9 [3],[10]   $ 2.9 [3],[10]   $ 0.1 [6],[7],[11]                
Investment, Identifier [Axis]: H-Food Holdings, LLC and Matterhorn Parent, LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1258.00% [5]   1258.00% [5]   11.38% [1] 1258.00% [5] 1258.00% [5] 1258.00% [5] 1258.00% [5] 11.38% [1] 11.38% [1] 11.38% [1] 11.38% [1]
Total first lien senior secured loans $ 73.0 [3]   $ 73.0 [3]   $ 73.0 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 62.8 [3]   62.8 [3]   62.8 [7]                
Investment, Identifier [Axis]: HAI Acquisition Corporation and Aloha Topco, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         19.0                
Less: funded commitments         0.0                
Total unfunded commitments         19.0                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         19.0                
Investment, Identifier [Axis]: HAI Acquisition Corporation and Aloha Topco, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 3.1                
Investment, Identifier [Axis]: HAI Acquisition Corporation and Aloha Topco, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.42%         10.42% 10.42% 10.42% 10.42%
Total first lien senior secured loans [6],[7]         $ 60.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 60.5                
Investment, Identifier [Axis]: HAI Acquisition Corporation and Aloha Topco, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         11.41%         11.41% 11.41% 11.41% 11.41%
Total first lien senior secured loans [6],[7]         $ 7.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 7.8                
Investment, Identifier [Axis]: HAI Acquisition Corporation and Aloha Topco, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.42%         10.42% 10.42% 10.42% 10.42%
Total first lien senior secured loans [6],[7]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.1                
Investment, Identifier [Axis]: HCI Equity, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   0.0                
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: HCI Equity, LLC, Member interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [4],[10]   0.0 [4],[10]   0.0 [8],[11]                
Investment, Identifier [Axis]: HGC Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.5   7.5   7.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 7.5   7.5   7.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 7.5   7.5   7.5                
Investment, Identifier [Axis]: HH-Stella, Inc. and Bedrock Parent Holdings, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 26.3   26.3   14.8                
Less: funded commitments (0.3)   (0.3)   (2.8)                
Total unfunded commitments 26.0   26.0   12.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions (10.7)   (10.7)   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 15.3   15.3   12.0                
Investment, Identifier [Axis]: HH-Stella, Inc. and Bedrock Parent Holdings, LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.6 [3]   $ 2.6 [3]   $ 2.2 [7]                
Investment, Identifier [Axis]: HH-Stella, Inc. and Bedrock Parent Holdings, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1154.00% [5]   1154.00% [5]   10.19% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 10.19% [1] 10.19% [1] 10.19% [1] 10.19% [1]
Total first lien senior secured loans $ 8.9 [2],[3]   $ 8.9 [2],[3]   $ 5.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.9 [2],[3]   $ 8.9 [2],[3]   $ 5.7 [6],[7]                
Investment, Identifier [Axis]: HH-Stella, Inc. and Bedrock Parent Holdings, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5]   [5]   9.94% [1] [5] [5] [5] [5] 9.94% [1] 9.94% [1] 9.94% [1] 9.94% [1]
Total first lien senior secured loans $ 0.0 [17]   $ 0.0 [17]   $ 2.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [17]   $ 0.0 [17]   $ 2.7 [6],[7]                
Investment, Identifier [Axis]: Halcon Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1289.00% [5]   1289.00% [5]   12.20% [1] 1289.00% [5] 1289.00% [5] 1289.00% [5] 1289.00% [5] 12.20% [1] 12.20% [1] 12.20% [1] 12.20% [1]
Total first lien senior secured loans $ 12.0 [3]   $ 12.0 [3]   $ 13.4 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 12.0 [3]   12.0 [3]   13.4 [7]                
Investment, Identifier [Axis]: Halex Holdings, Inc.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   0.0                
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: Halex Holdings, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   $ 0.0                
Investment, Identifier [Axis]: Hanger, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 27.1   27.1                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 27.1   27.1                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 27.1   $ 27.1                    
Investment, Identifier [Axis]: Hanger, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.43%         10.43% 10.43% 10.43% 10.43%
Total first lien senior secured loans [6],[7]         $ 54.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 53.2                
Investment, Identifier [Axis]: Hanger, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1158.00%   1158.00%     1158.00% 1158.00% 1158.00% 1158.00%        
Total first lien senior secured loans [2],[3] $ 54.0   $ 54.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 54.0   $ 54.0                    
Investment, Identifier [Axis]: Hanger, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1158.00%   1158.00%     1158.00% 1158.00% 1158.00% 1158.00%        
Total first lien senior secured loans [2],[3] $ 16.7   $ 16.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 16.7   $ 16.7                    
Investment, Identifier [Axis]: Hanger, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         13.93%         13.93% 13.93% 13.93% 13.93%
Total first lien senior secured loans [6],[7]         $ 110.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         106.8                
Investment, Identifier [Axis]: Hanger, Inc., Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1508.00%   1508.00%     1508.00% 1508.00% 1508.00% 1508.00%        
Total first lien senior secured loans [2],[3] $ 110.6   $ 110.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 110.6   $ 110.6                    
Investment, Identifier [Axis]: Hanger, Inc., Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1508.00%   1508.00%     1508.00% 1508.00% 1508.00% 1508.00%        
Total first lien senior secured loans [2],[3] $ 15.4   $ 15.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 15.4   15.4                    
Investment, Identifier [Axis]: Harvey Tool Company, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 25.9   25.9   28.5                
Less: funded commitments (2.7)   (2.7)   0.0                
Total unfunded commitments 23.2   23.2   28.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 23.2   $ 23.2   $ 28.5                
Investment, Identifier [Axis]: Harvey Tool Company, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1113.00% [5]   1113.00% [5]   10.64% [1] 1113.00% [5] 1113.00% [5] 1113.00% [5] 1113.00% [5] 10.64% [1] 10.64% [1] 10.64% [1] 10.64% [1]
Total first lien senior secured loans $ 3.6 [2],[3]   $ 3.6 [2],[3]   $ 1.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.6 [2],[3]   $ 3.6 [2],[3]   1.1 [6],[7]                
Investment, Identifier [Axis]: Harvey Tool Company, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1100.00%   1100.00%     1100.00% 1100.00% 1100.00% 1100.00%        
Total first lien senior secured loans [2],[3] $ 2.7   $ 2.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 2.7   2.7                    
Investment, Identifier [Axis]: HealthEdge Software, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 30.9   30.9   36.2                
Less: funded commitments (0.3)   (0.3)   (0.3)                
Total unfunded commitments 30.6   30.6   35.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 30.6   $ 30.6   $ 35.9                
Investment, Identifier [Axis]: HealthEdge Software, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         11.74%         11.74% 11.74% 11.74% 11.74%
Total first lien senior secured loans [6],[7]         $ 87.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         87.2                
Investment, Identifier [Axis]: HealthEdge Software, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1243.00%   1243.00%     1243.00% 1243.00% 1243.00% 1243.00%        
Total first lien senior secured loans [2],[3] $ 87.2   $ 87.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 87.2   $ 87.2                    
Investment, Identifier [Axis]: HealthEdge Software, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1243.00%   1243.00%     1243.00% 1243.00% 1243.00% 1243.00%        
Total first lien senior secured loans [2],[3] $ 5.3   $ 5.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 5.3   5.3                    
Investment, Identifier [Axis]: HealthEdge Software, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [3],[17]   0.0 [3],[17]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3],[17]   0.0 [3],[17]   0.0 [15]                
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.0   4.0   4.0                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.0   4.0   4.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.0   $ 4.0   $ 4.0                
Investment, Identifier [Axis]: Heavy Construction Systems Specialists, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1082.00% [5]   1082.00% [5]   9.88% [1] 1082.00% [5] 1082.00% [5] 1082.00% [5] 1082.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Heelstone Renewable Energy, LLC and Heelstone Renewable Energy Investors, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   95.4                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     6.8   7.1                
Capital structuring service fees     0.0   1.9                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     31.2   42.6                
Fair Value 247.7   247.7   209.6                
Investment, Identifier [Axis]: Heelstone Renewable Energy, LLC and Heelstone Renewable Energy Investors, LLC, Class A1 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 153.3   153.3   124.0                
Investment, Identifier [Axis]: Heelstone Renewable Energy, LLC and Heelstone Renewable Energy Investors, LLC, Class A2 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 8.2   8.2   $ 6.3                
Investment, Identifier [Axis]: Heelstone Renewable Energy, LLC and Heelstone Renewable Energy Investors, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         11.00%         11.00% 11.00% 11.00% 11.00%
Total first lien senior secured loans 86.2 [3]   86.2 [3]   $ 79.3 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 86.2 [3]   86.2 [3]   79.3 [7]                
Investment, Identifier [Axis]: Helios Service Partners, LLC and Astra Service Partners, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.3   7.3                    
Less: funded commitments (0.1)   (0.1)                    
Total unfunded commitments 7.2   7.2                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 7.2   $ 7.2                    
Investment, Identifier [Axis]: Helios Service Partners, LLC and Astra Service Partners, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 1188.00%   1188.00%     1188.00% 1188.00% 1188.00% 1188.00%        
Total first lien senior secured loans [2],[3] $ 3.8   $ 3.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 3.7   $ 3.7                    
Investment, Identifier [Axis]: Helios Service Partners, LLC and Astra Service Partners, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 1166.00%   1166.00%     1166.00% 1166.00% 1166.00% 1166.00%        
Total first lien senior secured loans [2],[3] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.1   $ 0.1                    
Investment, Identifier [Axis]: Helix Acquisition Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1249.00%   1249.00%     1249.00% 1249.00% 1249.00% 1249.00%        
Total first lien senior secured loans [2],[3] $ 12.6   $ 12.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 12.6   12.6                    
Investment, Identifier [Axis]: Help/Systems Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.5   7.5   7.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 7.5   7.5   7.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 7.5   7.5   7.5                
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.4   5.4                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 5.4   5.4                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 5.4   5.4                    
Investment, Identifier [Axis]: High Street Buyer, Inc. and High Street Holdco LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 21.5   21.5   25.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 21.5   21.5   25.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 21.5   21.5   $ 25.5                
Investment, Identifier [Axis]: High Street Buyer, Inc. and High Street Holdco LLC 1                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 64.6   64.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 64.6   64.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 64.6   $ 64.6                    
Investment, Identifier [Axis]: High Street Buyer, Inc. and High Street Holdco LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1154.00% [5]   1154.00% [5]   10.73% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 22.6 [2],[3]   $ 22.6 [2],[3]   $ 22.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 22.6 [2],[3]   $ 22.6 [2],[3]   $ 22.6 [6],[7]                
Investment, Identifier [Axis]: High Street Buyer, Inc. and High Street Holdco LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1154.00% [5]   1154.00% [5]   9.99% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 9.99% [1] 9.99% [1] 9.99% [1] 9.99% [1]
Total first lien senior secured loans $ 12.2 [2],[3]   $ 12.2 [2],[3]   $ 14.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 12.2 [2],[3]   $ 12.2 [2],[3]   $ 14.4 [6],[7]                
Investment, Identifier [Axis]: High Street Buyer, Inc. and High Street Holdco LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.73% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 18.6 [2],[3]   $ 18.6 [2],[3]   $ 12.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 18.6 [2],[3]   18.6 [2],[3]   12.1 [6],[7]                
Investment, Identifier [Axis]: High Street Buyer, Inc. and High Street Holdco LLC, Series A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 9.6 [3]   9.6 [3]   7.1 [7]                
Investment, Identifier [Axis]: High Street Buyer, Inc. and High Street Holdco LLC, Series A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 180.7 [3]   180.7 [3]   112.9 [7]                
Investment, Identifier [Axis]: High Street Buyer, Inc. and High Street Holdco LLC, Series C common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 18.1 [3]   $ 18.1 [3]   $ 8.6 [7]                
Investment, Identifier [Axis]: HighPeak Energy, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1306.00%   1306.00%     1306.00% 1306.00% 1306.00% 1306.00%        
Total first lien senior secured loans [2],[3],[4] $ 91.9   $ 91.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 91.0   $ 91.0                    
Investment, Identifier [Axis]: HighTower Holding, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 675.00% [5]   675.00% [5]   675.00% [1] 675.00% [5] 675.00% [5] 675.00% [5] 675.00% [5] 675.00% [1] 675.00% [1] 675.00% [1] 675.00% [1]
Total first lien senior secured loans $ 8.1 [3],[4],[10]   $ 8.1 [3],[4],[10]   $ 8.1 [7],[8],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 6.9 [3],[4],[10]   6.9 [3],[4],[10]   6.7 [7],[8],[11]                
Investment, Identifier [Axis]: Highline Aftermarket Acquisition, LLC, Highline Aftermarket SC Acquisition, Inc. and Highline PPC Blocker LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.5   9.5   9.5                
Less: funded commitments (0.2)   (0.2)   (1.1)                
Total unfunded commitments 9.3   9.3   8.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 9.3   9.3   8.4                
Investment, Identifier [Axis]: Highline Aftermarket Acquisition, LLC, Highline Aftermarket SC Acquisition, Inc. and Highline PPC Blocker LLC, Co-invest units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.5 [3]   $ 4.5 [3]   $ 3.8 [7]                
Investment, Identifier [Axis]: Highline Aftermarket Acquisition, LLC, Highline Aftermarket SC Acquisition, Inc. and Highline PPC Blocker LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 992.00% [5]   992.00% [5]   8.88% [1] 992.00% [5] 992.00% [5] 992.00% [5] 992.00% [5] 8.88% [1] 8.88% [1] 8.88% [1] 8.88% [1]
Total first lien senior secured loans $ 7.1 [2],[3],[10]   $ 7.1 [2],[3],[10]   $ 11.9 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 7.0 [2],[3],[10]   7.0 [2],[3],[10]   $ 10.9 [6],[7],[11]                
Investment, Identifier [Axis]: Highline Aftermarket Acquisition, LLC, Highline Aftermarket SC Acquisition, Inc. and Highline PPC Blocker LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.13%         8.13% 8.13% 8.13% 8.13%
Total first lien senior secured loans 0.0 [17]   0.0 [17]   $ 1.0 [7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [17]   $ 0.0 [17]   $ 0.9 [7],[14]                
Investment, Identifier [Axis]: Highline Aftermarket Acquisition, LLC, Highline Aftermarket SC Acquisition, Inc. and Highline PPC Blocker LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1356.00% [5]   1356.00% [5]   12.72% [1] 1356.00% [5] 1356.00% [5] 1356.00% [5] 1356.00% [5] 12.72% [1] 12.72% [1] 12.72% [1] 12.72% [1]
Total first lien senior secured loans $ 70.4 [2],[3]   $ 70.4 [2],[3]   $ 70.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 69.0 [2],[3]   $ 69.0 [2],[3]   64.0 [6],[7]                
Investment, Identifier [Axis]: Hometown Food Company                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         3.9                
Less: funded commitments         (0.8)                
Total unfunded commitments         3.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 3.1                
Investment, Identifier [Axis]: Hometown Food Company, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.39%         9.39% 9.39% 9.39% 9.39%
Total first lien senior secured loans [6],[7],[14]         $ 0.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[14]         $ 0.8                
Investment, Identifier [Axis]: Honor Technology, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1543.00% [5]   1543.00% [5]   14.38% [1] 1543.00% [5] 1543.00% [5] 1543.00% [5] 1543.00% [5] 14.38% [1] 14.38% [1] 14.38% [1] 14.38% [1]
Total first lien senior secured loans $ 2.5 [2],[3]   $ 2.5 [2],[3]   $ 2.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.3 [2],[3]   2.3 [2],[3]   2.3 [6],[7]                
Investment, Identifier [Axis]: Honor Technology, Inc., Warrant to purchase shares of Series D-2 preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: Honor Technology, Inc., Warrant to purchase shares of series D-2 preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         0.0                
Investment, Identifier [Axis]: Huskies Parent, Inc., GI Insurity Parent LLC and GI Insurity TopCo LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 22.6   22.6   22.6                
Less: funded commitments (13.3)   (13.3)   (9.4)                
Total unfunded commitments 9.3   9.3   13.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 9.3   9.3   13.2                
Investment, Identifier [Axis]: Huskies Parent, Inc., GI Insurity Parent LLC and GI Insurity TopCo LP, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 5.5                
Investment, Identifier [Axis]: Huskies Parent, Inc., GI Insurity Parent LLC and GI Insurity TopCo LP, Company units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 5.7   $ 5.7                    
Investment, Identifier [Axis]: Huskies Parent, Inc., GI Insurity Parent LLC and GI Insurity TopCo LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   10.23% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 59.9 [2],[3]   $ 59.9 [2],[3]   $ 60.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 55.1 [2],[3]   $ 55.1 [2],[3]   $ 56.1 [6],[7]                
Investment, Identifier [Axis]: Huskies Parent, Inc., GI Insurity Parent LLC and GI Insurity TopCo LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   10.23% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 13.3 [2],[3]   $ 13.3 [2],[3]   $ 9.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 12.2 [2],[3]   12.2 [2],[3]   8.7 [6],[7]                
Investment, Identifier [Axis]: Huskies Parent, Inc., GI Insurity Parent LLC and GI Insurity TopCo LP, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 107.2 [3]   107.2 [3]   99.5 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 87.9 [3]   87.9 [3]   82.6 [7]                
Investment, Identifier [Axis]: Hyland Software, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.0   6.0                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 6.0   6.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 6.0   $ 6.0                    
Investment, Identifier [Axis]: Hyland Software, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1132.00%   1132.00%     1132.00% 1132.00% 1132.00% 1132.00%        
Total first lien senior secured loans [2],[3] $ 97.5   $ 97.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 96.1   96.1                    
Investment, Identifier [Axis]: IQN Holding Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.8   4.8   6.8                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.8   4.8   6.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.8   $ 4.8   $ 6.8                
Investment, Identifier [Axis]: IQN Holding Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1067.00%   1067.00%     1067.00% 1067.00% 1067.00% 1067.00%        
Total first lien senior secured loans [2],[3] $ 1.4   $ 1.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.4   1.4                    
Investment, Identifier [Axis]: IQN Holding Corp., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.65%         9.65% 9.65% 9.65% 9.65%
Total first lien senior secured loans [6],[7]         $ 23.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 23.3                
Investment, Identifier [Axis]: IQN Holding Corp., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.71%         9.71% 9.71% 9.71% 9.71%
Total first lien senior secured loans [6],[7]         $ 0.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.4                
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. and ISQ Hawkeye Holdings, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.1   9.1                    
Less: funded commitments (0.3)   (0.3)                    
Total unfunded commitments 8.8   8.8                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 8.8   8.8                    
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. and ISQ Hawkeye Holdings, L.P., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 18.4 [3]   $ 18.4 [3]   $ 12.5 [7]                
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. and ISQ Hawkeye Holdings, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1138.00% [5]   1138.00% [5]   10.63% [1] 1138.00% [5] 1138.00% [5] 1138.00% [5] 1138.00% [5] 10.63% [1] 10.63% [1] 10.63% [1] 10.63% [1]
Total first lien senior secured loans $ 4.1 [2],[3]   $ 4.1 [2],[3]   $ 3.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.1 [2],[3]   4.1 [2],[3]   3.5 [6],[7]                
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. and ISQ Hawkeye Holdings, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [17]   0.0 [17]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   0.0 [15]                
Investment, Identifier [Axis]: ISQ Hawkeye Holdco, Inc. and ISQ Hawkeye Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         9.8                
Less: funded commitments         (0.2)                
Total unfunded commitments         9.6                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         9.6                
Investment, Identifier [Axis]: ITI Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.7   5.7   5.7                
Less: funded commitments (4.3)   (4.3)   (2.0)                
Total unfunded commitments 1.4   1.4   3.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.4   $ 1.4   $ 3.7                
Investment, Identifier [Axis]: ITI Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1106.00% [5]   1106.00% [5]   10.08% [1] 1106.00% [5] 1106.00% [5] 1106.00% [5] 1106.00% [5] 10.08% [1] 10.08% [1] 10.08% [1] 10.08% [1]
Total first lien senior secured loans $ 34.7 [2],[3]   $ 34.7 [2],[3]   $ 35.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 33.4 [2],[3]   $ 33.4 [2],[3]   $ 34.7 [6],[7]                
Investment, Identifier [Axis]: ITI Holdings, Inc., First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1300.00% [5]   1300.00% [5]   12.00% [1] 1300.00% [5] 1300.00% [5] 1300.00% [5] 1300.00% [5] 12.00% [1] 12.00% [1] 12.00% [1] 12.00% [1]
Total first lien senior secured loans $ 1.5 [2],[3]   $ 1.5 [2],[3]   $ 3.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.4 [2],[3]   $ 1.4 [2],[3]   $ 2.9 [6],[7]                
Investment, Identifier [Axis]: ITI Holdings, Inc., First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1093.00% [5]   1093.00% [5]   9.88% [1] 1093.00% [5] 1093.00% [5] 1093.00% [5] 1093.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 2.0 [2],[3]   $ 2.0 [2],[3]   $ 1.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.9 [2],[3]   $ 1.9 [2],[3]   $ 1.1 [6],[7]                
Investment, Identifier [Axis]: ITI Holdings, Inc., First lien senior secured revolving loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1300.00% [5]   1300.00% [5]   12.00% [1] 1300.00% [5] 1300.00% [5] 1300.00% [5] 1300.00% [5] 12.00% [1] 12.00% [1] 12.00% [1] 12.00% [1]
Total first lien senior secured loans $ 2.3 [2],[3]   $ 2.3 [2],[3]   $ 0.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.3 [2],[3]   2.3 [2],[3]   0.8 [6],[7]                
Investment, Identifier [Axis]: IV Rollover Holdings, LLC, Class B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: IV Rollover Holdings, LLC, Class X units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.1 [3]   2.1 [3]   2.1 [7]                
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. and Scanner Holdings Corporation                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     11.5   0.0                
Redemptions (cost)     0.0   3.9                
Sales (cost)     0.0   0.0                
Interest income     1.7   2.4                
Capital structuring service fees     0.0   0.7                
Dividend income     0.3   23.1                
Other income     0.0   0.5                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     4.1   (5.4)                
Fair Value 64.1   64.1   47.8                
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. and Scanner Holdings Corporation, Class A common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 47.2   $ 47.2   0.1                
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. and Scanner Holdings Corporation, Class B common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         $ 1.3                
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. and Scanner Holdings Corporation, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 14.00% [5]   14.00% [5]   14.00% [1] 14.00% [5] 14.00% [5] 14.00% [5] 14.00% [5] 14.00% [1] 14.00% [1] 14.00% [1] 14.00% [1]
Total first lien senior secured loans $ 16.9 [3]   $ 16.9 [3]   $ 16.6 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 16.9 [3]   $ 16.9 [3]   16.6 [7]                
Investment, Identifier [Axis]: Imaging Business Machines, L.L.C. and Scanner Holdings Corporation, Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         $ 29.8                
Investment, Identifier [Axis]: Implus Footcare, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon 1280.00% [5]   1280.00% [5]   13.98% [1] 1280.00% [5] 1280.00% [5] 1280.00% [5] 1280.00% [5] 13.98% [1] 13.98% [1] 13.98% [1] 13.98% [1]
Total first lien senior secured loans $ 1.3 [2],[3]   $ 1.3 [2],[3]   $ 102.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.1 [2],[3]   $ 1.1 [2],[3]   $ 92.4 [6],[7]                
Investment, Identifier [Axis]: Implus Footcare, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon 1280.00% [5]   1280.00% [5]   12.48% [1] 1280.00% [5] 1280.00% [5] 1280.00% [5] 1280.00% [5] 12.48% [1] 12.48% [1] 12.48% [1] 12.48% [1]
Total first lien senior secured loans $ 117.1 [2],[3]   $ 117.1 [2],[3]   $ 14.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 104.2 [2],[3]   $ 104.2 [2],[3]   $ 12.6 [6],[7]                
Investment, Identifier [Axis]: Implus Footcare, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon 1280.00% [5]   1280.00% [5]   12.48% [1] 1280.00% [5] 1280.00% [5] 1280.00% [5] 1280.00% [5] 12.48% [1] 12.48% [1] 12.48% [1] 12.48% [1]
Total first lien senior secured loans $ 5.0 [2],[3]   $ 5.0 [2],[3]   $ 5.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.5 [2],[3]   $ 4.5 [2],[3]   $ 4.5 [6],[7]                
Investment, Identifier [Axis]: Implus Footcare, LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon [1]         13.98%         13.98% 13.98% 13.98% 13.98%
Total first lien senior secured loans [6],[7]         $ 1.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 1.1                
Investment, Identifier [Axis]: Imprivata, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1157.00% [5]   1157.00% [5]   10.57% [1] 1157.00% [5] 1157.00% [5] 1157.00% [5] 1157.00% [5] 10.57% [1] 10.57% [1] 10.57% [1] 10.57% [1]
Total first lien senior secured loans $ 16.1 [2],[3]   $ 16.1 [2],[3]   $ 16.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 15.5 [2],[3]   15.5 [2],[3]   15.1 [6],[7]                
Investment, Identifier [Axis]: Infinity Home Services HoldCo, Inc. and IHS Parent Holdings, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.5   6.5   13.0                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 6.5   6.5   13.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 6.5   6.5   13.0                
Investment, Identifier [Axis]: Infinity Home Services HoldCo, Inc. and IHS Parent Holdings, L.P., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 11.9 [3]   $ 11.9 [3]   $ 9.5 [7],[16]                
Investment, Identifier [Axis]: Infinity Home Services HoldCo, Inc. and IHS Parent Holdings, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1224.00% [5]   1224.00% [5]   11.40% [1] 1224.00% [5] 1224.00% [5] 1224.00% [5] 1224.00% [5] 11.40% [1] 11.40% [1] 11.40% [1] 11.40% [1]
Total first lien senior secured loans $ 13.8 [2],[3]   $ 13.8 [2],[3]   $ 11.4 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 13.8 [2],[3]   $ 13.8 [2],[3]   $ 11.1 [6],[7],[16]                
Investment, Identifier [Axis]: Inmar, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1086.00%   1086.00%     1086.00% 1086.00% 1086.00% 1086.00%        
Total first lien senior secured loans [2],[3] $ 14.5   $ 14.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 14.4   14.4                    
Investment, Identifier [Axis]: Inmar, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.38%         12.38% 12.38% 12.38% 12.38%
Total first lien senior secured loans [6],[7]         $ 28.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         26.6                
Investment, Identifier [Axis]: Inszone Mid, LLC and INSZ Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.2   8.2   17.2                
Less: funded commitments (1.2)   (1.2)   0.0                
Total unfunded commitments 7.0   7.0   17.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 7.0   $ 7.0   $ 17.2                
Investment, Identifier [Axis]: Inszone Mid, LLC and INSZ Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1217.00% [5]   1217.00% [5]   11.33% [1] 1217.00% [5] 1217.00% [5] 1217.00% [5] 1217.00% [5] 11.33% [1] 11.33% [1] 11.33% [1] 11.33% [1]
Total first lien senior secured loans $ 26.5 [2],[3]   $ 26.5 [2],[3]   $ 17.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 26.5 [2],[3]   $ 26.5 [2],[3]   17.1 [6],[7]                
Investment, Identifier [Axis]: Inszone Mid, LLC and INSZ Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1217.00%   1217.00%     1217.00% 1217.00% 1217.00% 1217.00%        
Total first lien senior secured loans [2],[3] $ 1.2   $ 1.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.2   1.2                    
Investment, Identifier [Axis]: Inszone Mid, LLC and INSZ Holdings, LLC, Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.4   2.4   1.7                
Investment, Identifier [Axis]: Ivy Hill Asset Management, L.P.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     405.2   1,544.2                
Redemptions (cost)     627.4   277.6                
Sales (cost)     0.0   0.0                
Interest income     27.8   22.5                
Capital structuring service fees     0.0   0.0                
Dividend income     179.0   205.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     41.2   (1.0)                
Fair Value 2,020.0   2,020.0   2,201.1                
Investment, Identifier [Axis]: Ivy Hill Asset Management, L.P., Member interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1,895.4 [3],[4]   $ 1,895.4 [3],[4]   $ 1,701.1 [8]                
Investment, Identifier [Axis]: Ivy Hill Asset Management, L.P., Subordinated revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1203.00% [5]   1203.00% [5]   11.01% [1] 1203.00% [5] 1203.00% [5] 1203.00% [5] 1203.00% [5] 11.01% [1] 11.01% [1] 11.01% [1] 11.01% [1]
Total first lien senior secured loans $ 124.6 [2],[3],[4]   $ 124.6 [2],[3],[4]   $ 500.0 [6],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 124.6 [2],[3],[4]   124.6 [2],[3],[4]   500.0 [6],[8]                
Investment, Identifier [Axis]: JDC Healthcare Management, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         4.8                
Less: funded commitments         (4.8)                
Total unfunded commitments         0.0                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         0.0                
Investment, Identifier [Axis]: JDC Healthcare Management, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7],[9]         40.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[9]         22.1                
Investment, Identifier [Axis]: JDC Healthcare Management, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7],[9]         4.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[9]         2.6                
Investment, Identifier [Axis]: JDC Healthcare Management, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3],[12] 12.2   12.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[12] 0.7   0.7                    
Investment, Identifier [Axis]: JWC/KI Holdings, LLC, Membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.1 [3]   11.1 [3]   9.0 [7]                
Investment, Identifier [Axis]: Jenny C Acquisition, Inc., Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 1.6 [3]   1.6 [3]   1.6 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.6 [3]   1.6 [3]   $ 1.6 [7]                
Investment, Identifier [Axis]: Johnnie-O Inc. and Johnnie-O Holdings Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.0   0.0                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.0   0.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.0   $ 0.0                    
Investment, Identifier [Axis]: Johnnie-O Inc. and Johnnie-O Holdings Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         10.65%         10.65% 10.65% 10.65% 10.65%
Total first lien senior secured loans [6],[7]         $ 19.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         18.8                
Investment, Identifier [Axis]: Johnnie-O Inc. and Johnnie-O Holdings Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1162.00%   1162.00%     1162.00% 1162.00% 1162.00% 1162.00%        
Total first lien senior secured loans [2],[3] $ 19.1   $ 19.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 19.1   $ 19.1                    
Investment, Identifier [Axis]: Johnnie-O Inc. and Johnnie-O Holdings Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1162.00%   1162.00%     1162.00% 1162.00% 1162.00% 1162.00%        
Total first lien senior secured loans [2],[3] $ 4.0   $ 4.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 4.0   4.0                    
Investment, Identifier [Axis]: Johnnie-O Inc. and Johnnie-O Holdings Inc., Series A convertible preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.2 [3]   4.2 [3]   5.5 [7]                
Investment, Identifier [Axis]: Johnnie-O Inc. and Johnnie-O Holdings Inc., Warrant to purchase shares of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.7 [3]   2.7 [3]   1.3 [7]                
Investment, Identifier [Axis]: Joyce Lane Capital LLC and Joyce Lane Financing SPV LLC (fka Ciena Capital LLC)                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)         0.0                
Redemptions (cost)         0.3                
Sales (cost)         0.0                
Interest income         0.1                
Capital structuring service fees         0.0                
Dividend income         0.0                
Other income         0.0                
Net realized gains (losses):         0.5                
Net unrealized gains (losses):         0.1                
Fair Value         0.0                
Investment, Identifier [Axis]: K2 Insurance Services, LLC and K2 Holdco LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         9.1                
Less: funded commitments         0.0                
Total unfunded commitments         9.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         9.1                
Investment, Identifier [Axis]: K2 Insurance Services, LLC and K2 Holdco LP, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 2.3                
Investment, Identifier [Axis]: K2 Insurance Services, LLC and K2 Holdco LP, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.73%         9.73% 9.73% 9.73% 9.73%
Total first lien senior secured loans [6],[7]         $ 50.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 50.4                
Investment, Identifier [Axis]: K2 Insurance Services, LLC and K2 Holdco LP, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.73%         9.73% 9.73% 9.73% 9.73%
Total first lien senior secured loans [6],[7]         $ 2.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 2.3                
Investment, Identifier [Axis]: K2 Insurance Services, LLC and K2 Holdco LP, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.54%         9.54% 9.54% 9.54% 9.54%
Total first lien senior secured loans [6],[7]         $ 0.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.2                
Investment, Identifier [Axis]: KBHS Acquisition, LLC (d/b/a Alita Care, LLC)                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.0   5.0   5.0                
Less: funded commitments (3.4)   (3.4)   (3.2)                
Total unfunded commitments 1.6   1.6   1.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.6   $ 1.6   $ 1.8                
Investment, Identifier [Axis]: KBHS Acquisition, LLC (d/b/a Alita Care, LLC), First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         9.72%         9.72% 9.72% 9.72% 9.72%
Total first lien senior secured loans [6],[7]         $ 3.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 3.1                
Investment, Identifier [Axis]: KBHS Acquisition, LLC (d/b/a Alita Care, LLC), First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 12.50%   12.50%     12.50% 12.50% 12.50% 12.50%        
Total first lien senior secured loans [2],[3] $ 0.4   $ 0.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.4   $ 0.4                    
Investment, Identifier [Axis]: KBHS Acquisition, LLC (d/b/a Alita Care, LLC), First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 10.53%   10.53%     10.53% 10.53% 10.53% 10.53%        
Total first lien senior secured loans [2],[3] $ 3.0   $ 3.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 2.9   $ 2.9                    
Investment, Identifier [Axis]: KNPC HoldCo, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1070.00% [5]   1070.00% [5]   9.92% [1] 1070.00% [5] 1070.00% [5] 1070.00% [5] 1070.00% [5] 9.92% [1] 9.92% [1] 9.92% [1] 9.92% [1]
Total first lien senior secured loans $ 5.6 [2],[3]   $ 5.6 [2],[3]   $ 5.6 [6]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.6 [2],[3]   $ 5.6 [2],[3]   $ 5.5 [6]                
Investment, Identifier [Axis]: KNPC HoldCo, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1195.00% [5]   1195.00% [5]   11.42% [1] 1195.00% [5] 1195.00% [5] 1195.00% [5] 1195.00% [5] 11.42% [1] 11.42% [1] 11.42% [1] 11.42% [1]
Total first lien senior secured loans $ 1.3 [2],[3]   $ 1.3 [2],[3]   $ 1.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.3 [2],[3]   1.3 [2],[3]   1.3 [6],[7]                
Investment, Identifier [Axis]: KPS Global LLC and Cool Group LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.9   $ 4.9   $ 5.2                
Investment, Identifier [Axis]: KPS Global LLC and Cool Group LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1140.00% [5]   1140.00% [5]   9.92% [1] 1140.00% [5] 1140.00% [5] 1140.00% [5] 1140.00% [5] 9.92% [1] 9.92% [1] 9.92% [1] 9.92% [1]
Total first lien senior secured loans $ 7.6 [2],[3]   $ 7.6 [2],[3]   $ 12.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.6 [2],[3]   $ 7.6 [2],[3]   $ 12.6 [6],[7]                
Investment, Identifier [Axis]: KPS Global LLC and Cool Group LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1140.00% [5]   1140.00% [5]   9.92% [1] 1140.00% [5] 1140.00% [5] 1140.00% [5] 1140.00% [5] 9.92% [1] 9.92% [1] 9.92% [1] 9.92% [1]
Total first lien senior secured loans $ 2.0 [2],[3]   $ 2.0 [2],[3]   $ 3.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.0 [2],[3]   2.0 [2],[3]   3.3 [6],[7]                
Investment, Identifier [Axis]: Kaseya Inc. and Knockout Intermediate Holdings I Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 30.5   30.5   31.2                
Less: funded commitments (6.9)   (6.9)   0.0                
Total unfunded commitments 23.6   23.6   31.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 23.6   $ 23.6   $ 31.2                
Investment, Identifier [Axis]: Kaseya Inc. and Knockout Intermediate Holdings I Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 11.62% [5]   11.62% [5]   10.33% [1] 11.62% [5] 11.62% [5] 11.62% [5] 11.62% [5] 10.33% [1] 10.33% [1] 10.33% [1] 10.33% [1]
Total first lien senior secured loans $ 168.1 [2],[3]   $ 168.1 [2],[3]   $ 167.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 164.7 [2],[3]   $ 164.7 [2],[3]   162.0 [6],[7]                
Investment, Identifier [Axis]: Kaseya Inc. and Knockout Intermediate Holdings I Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 11.57%   11.57%     11.57% 11.57% 11.57% 11.57%        
Total first lien senior secured loans [2],[3],[13] $ 4.9   $ 4.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[13] 4.8   4.8                    
Investment, Identifier [Axis]: Kaseya Inc. and Knockout Intermediate Holdings I Inc., Preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 42.7 [3]   $ 42.7 [3]   $ 40.0 [7]                
Investment, Identifier [Axis]: Kellermeyer Bergensons Services, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1152.00% [5]   1152.00% [5]   10.41% [1] 1152.00% [5] 1152.00% [5] 1152.00% [5] 1152.00% [5] 10.41% [1] 10.41% [1] 10.41% [1] 10.41% [1]
Total first lien senior secured loans $ 56.3 [2],[3]   $ 56.3 [2],[3]   $ 56.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 49.0 [2],[3]   $ 49.0 [2],[3]   $ 51.1 [6],[7]                
Investment, Identifier [Axis]: Kellermeyer Bergensons Services, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1152.00% [5]   1152.00% [5]   10.41% [1] 1152.00% [5] 1152.00% [5] 1152.00% [5] 1152.00% [5] 10.41% [1] 10.41% [1] 10.41% [1] 10.41% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Kene Acquisition, Inc. and Kene Holdings, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.9   8.9   8.9                
Less: funded commitments (0.2)   (0.2)   (0.2)                
Total unfunded commitments 8.7   8.7   8.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 8.7   8.7   8.7                
Investment, Identifier [Axis]: Kene Acquisition, Inc. and Kene Holdings, L.P., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.6 [3]   $ 8.6 [3]   $ 7.0 [7]                
Investment, Identifier [Axis]: Kene Acquisition, Inc. and Kene Holdings, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 979.00% [5]   979.00% [5]   8.98% [1] 979.00% [5] 979.00% [5] 979.00% [5] 979.00% [5] 8.98% [1] 8.98% [1] 8.98% [1] 8.98% [1]
Total first lien senior secured loans $ 40.3 [2],[3]   $ 40.3 [2],[3]   $ 40.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 40.3 [2],[3]   40.3 [2],[3]   39.8 [6],[7]                
Investment, Identifier [Axis]: Kene Acquisition, Inc. and Kene Holdings, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [17]   0.0 [17]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   0.0 [15]                
Investment, Identifier [Axis]: KeyStone Sub-debt HoldCo, LLC, Senior subordinated loan 1                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7]         60.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         58.8                
Investment, Identifier [Axis]: KeyStone Sub-debt HoldCo, LLC, Senior subordinated loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7]         8.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         7.8                
Investment, Identifier [Axis]: KeyStone Sub-debt HoldCo, LLC, Warrant to purchase Class C interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         8.3                
Investment, Identifier [Axis]: Kings Buyer, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.6   5.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 5.6   5.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.6   $ 5.6                    
Investment, Identifier [Axis]: Kings Buyer, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1200.00%   1200.00%     1200.00% 1200.00% 1200.00% 1200.00%        
Total first lien senior secured loans [2],[3] $ 16.5   $ 16.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 16.2   16.2                    
Investment, Identifier [Axis]: LJ Perimeter Buyer, Inc. and LJ Perimeter Co-Invest, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.6   5.6   10.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 5.6   5.6   10.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 5.6   5.6   $ 10.1                
Investment, Identifier [Axis]: LJ Perimeter Buyer, Inc. and LJ Perimeter Co-Invest, L.P. 1                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.9   1.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.9   1.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.9   $ 1.9                    
Investment, Identifier [Axis]: LJ Perimeter Buyer, Inc. and LJ Perimeter Co-Invest, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1202.00% [5]   1202.00% [5]   10.73% [1] 1202.00% [5] 1202.00% [5] 1202.00% [5] 1202.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 40.0 [2],[3]   $ 40.0 [2],[3]   $ 35.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 40.0 [2],[3]   40.0 [2],[3]   34.6 [6],[7]                
Investment, Identifier [Axis]: LJ Perimeter Buyer, Inc. and LJ Perimeter Co-Invest, L.P., Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.2 [3]   11.2 [3]   9.7 [7]                
Investment, Identifier [Axis]: LJP Purchaser, Inc. and LJP Topco, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.1   3.1   4.4                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.1   3.1   4.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 3.1   3.1   4.4                
Investment, Identifier [Axis]: LJP Purchaser, Inc. and LJP Topco, LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.8 [3]   $ 5.8 [3]   $ 5.4 [7]                
Investment, Identifier [Axis]: LJP Purchaser, Inc. and LJP Topco, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1173.00% [5]   1173.00% [5]   10.44% [1] 1173.00% [5] 1173.00% [5] 1173.00% [5] 1173.00% [5] 10.44% [1] 10.44% [1] 10.44% [1] 10.44% [1]
Total first lien senior secured loans $ 9.7 [2],[3]   $ 9.7 [2],[3]   $ 8.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 9.6 [2],[3]   9.6 [2],[3]   8.3 [6],[7]                
Investment, Identifier [Axis]: LS DE LLC and LM LSQ Investors LLC, Membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.1 [4]   $ 2.1 [4]   $ 3.0 [8]                
Investment, Identifier [Axis]: LS DE LLC and LM LSQ Investors LLC, Senior subordinated loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 11.00% [5]   11.00% [5]   10.50% [1] 11.00% [5] 11.00% [5] 11.00% [5] 11.00% [5] 10.50% [1] 10.50% [1] 10.50% [1] 10.50% [1]
Total first lien senior secured loans $ 37.1 [3],[4]   $ 37.1 [3],[4]   $ 3.0 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 35.6 [3],[4]   $ 35.6 [3],[4]   $ 3.0 [7],[8]                
Investment, Identifier [Axis]: LS DE LLC and LM LSQ Investors LLC, Senior subordinated loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 11.00% [5]   11.00% [5]   10.50% [1] 11.00% [5] 11.00% [5] 11.00% [5] 11.00% [5] 10.50% [1] 10.50% [1] 10.50% [1] 10.50% [1]
Total first lien senior secured loans $ 3.0 [3],[4]   $ 3.0 [3],[4]   $ 37.0 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.9 [3],[4]   2.9 [3],[4]   36.6 [7],[8]                
Investment, Identifier [Axis]: LSP Holdco, LLC and ZBS Mechanical Group Co-Invest Fund 2, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         3.9                
Less: funded commitments         0.0                
Total unfunded commitments         3.9                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 3.9                
Investment, Identifier [Axis]: LSP Holdco, LLC and ZBS Mechanical Group Co-Invest Fund 2, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.59%         10.59% 10.59% 10.59% 10.59%
Total first lien senior secured loans [6],[7],[16]         $ 21.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         $ 21.6                
Investment, Identifier [Axis]: LSP Holdco, LLC and ZBS Mechanical Group Co-Invest Fund 2, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.89%         10.89% 10.89% 10.89% 10.89%
Total first lien senior secured loans [6],[7],[16]         $ 6.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         $ 6.8                
Investment, Identifier [Axis]: LSP Holdco, LLC and ZBS Mechanical Group Co-Invest Fund 2, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.42%         10.42% 10.42% 10.42% 10.42%
Total first lien senior secured loans [6],[7],[16]         $ 6.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         6.2                
Investment, Identifier [Axis]: LSP Holdco, LLC and ZBS Mechanical Group Co-Invest Fund 2, LLC, Membership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [16]         15.5                
Investment, Identifier [Axis]: LTG Acquisition, Inc., Class A membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 19.6   19.6   41.3                
Less: funded commitments (5.2)   (5.2)   (8.8)                
Total unfunded commitments 14.4   14.4   32.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 14.4   14.4   32.5                
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.9 [3]   $ 2.9 [3]   $ 4.5 [7]                
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 12.15% [5]   12.15% [5]   9.98% [1] 12.15% [5] 12.15% [5] 12.15% [5] 12.15% [5] 9.98% [1] 9.98% [1] 9.98% [1] 9.98% [1]
Total first lien senior secured loans $ 23.4 [2],[3]   $ 23.4 [2],[3]   $ 23.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 21.5 [2],[3]   $ 21.5 [2],[3]   $ 22.7 [6],[7]                
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 12.17% [5]   12.17% [5]   8.73% [1] 12.17% [5] 12.17% [5] 12.17% [5] 12.17% [5] 8.73% [1] 8.73% [1] 8.73% [1] 8.73% [1]
Total first lien senior secured loans $ 16.6 [2],[3]   $ 16.6 [2],[3]   $ 16.7 [6]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 15.2 [2],[3]   $ 15.2 [2],[3]   $ 16.0 [6]                
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 12.17% [5]   12.17% [5]   9.55% [1] 12.17% [5] 12.17% [5] 12.17% [5] 12.17% [5] 9.55% [1] 9.55% [1] 9.55% [1] 9.55% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 4.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 4.2 [6],[7]                
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 12.27% [5]   12.27% [5]   8.73% [1] 12.27% [5] 12.27% [5] 12.27% [5] 12.27% [5] 8.73% [1] 8.73% [1] 8.73% [1] 8.73% [1]
Total first lien senior secured loans $ 4.4 [2],[3]   $ 4.4 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.0 [2],[3]   $ 4.0 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.25%         12.25% 12.25% 12.25% 12.25%
Total first lien senior secured loans [6],[7]         $ 8.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         8.4                
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 12.32%   12.32%     12.32% 12.32% 12.32% 12.32%        
Total first lien senior secured loans [2],[3] $ 0.6   $ 0.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.6   $ 0.6                    
Investment, Identifier [Axis]: Laboratories Bidco LLC and Laboratories Topco LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 15.25%   15.25%     15.25% 15.25% 15.25% 15.25%        
Total first lien senior secured loans [2],[3] $ 4.6   $ 4.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 4.2   4.2                    
Investment, Identifier [Axis]: Largest Portfolio Company Investment | Senior Direct Lending Program                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 370.0   370.0   377.0                
Investment, Identifier [Axis]: League One Volleyball, Inc., Series B preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: LeanTaaS Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 45.3   45.3   54.0                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 45.3   45.3   54.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 45.3   $ 45.3   $ 54.0                
Investment, Identifier [Axis]: LeanTaaS Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1289.00% [5]   1289.00% [5]   12.08% [1] 1289.00% [5] 1289.00% [5] 1289.00% [5] 1289.00% [5] 12.08% [1] 12.08% [1] 12.08% [1] 12.08% [1]
Total first lien senior secured loans $ 40.5 [2],[3]   $ 40.5 [2],[3]   $ 31.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 40.5 [2],[3]   40.5 [2],[3]   31.2 [6],[7]                
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC and Leviathan Holdings, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.5   1.5   5.5                
Less: funded commitments 0.0   0.0   (0.7)                
Total unfunded commitments 1.5   1.5   4.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.5   $ 1.5   $ 4.8                
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC and Leviathan Holdings, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1304.00% [5]   1304.00% [5]   12.54% [1] 1304.00% [5] 1304.00% [5] 1304.00% [5] 1304.00% [5] 12.54% [1] 12.54% [1] 12.54% [1] 12.54% [1]
Total first lien senior secured loans $ 16.1 [2],[3]   $ 16.1 [2],[3]   $ 16.2 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 16.1 [2],[3]   16.1 [2],[3]   $ 15.8 [6],[7],[16]                
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC and Leviathan Holdings, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.54%         12.54% 12.54% 12.54% 12.54%
Total first lien senior secured loans [6],[7],[16]         $ 0.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         0.7                
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC and Leviathan Holdings, L.P., Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.0   2.0   2.0 [16]                
Investment, Identifier [Axis]: Lew's Intermediate Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.3   2.3   2.3                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.3   2.3   2.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.3   $ 2.3   $ 2.3                
Investment, Identifier [Axis]: Lew's Intermediate Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1042.00% [5]   1042.00% [5]   9.40% [1] 1042.00% [5] 1042.00% [5] 1042.00% [5] 1042.00% [5] 9.40% [1] 9.40% [1] 9.40% [1] 9.40% [1]
Total first lien senior secured loans $ 1.0 [2],[3]   $ 1.0 [2],[3]   $ 1.0 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.9 [2],[3]   0.9 [2],[3]   0.9 [6],[7],[16]                
Investment, Identifier [Axis]: Lido Advisors, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.8   5.8   0.8                
Less: funded commitments (0.6)   (0.6)   (0.4)                
Total unfunded commitments 5.2   5.2   0.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.2   $ 5.2   $ 0.4                
Investment, Identifier [Axis]: Lido Advisors, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1156.00%   1156.00%     1156.00% 1156.00% 1156.00% 1156.00%        
Total first lien senior secured loans [2],[3] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.0   $ 1.0                    
Investment, Identifier [Axis]: Lido Advisors, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1145.00% [5]   1145.00% [5]   9.05% [1] 1145.00% [5] 1145.00% [5] 1145.00% [5] 1145.00% [5] 9.05% [1] 9.05% [1] 9.05% [1] 9.05% [1]
Total first lien senior secured loans $ 0.6 [2],[3]   $ 0.6 [2],[3]   $ 0.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.5 [2],[3]   0.5 [2],[3]   0.4 [6],[7]                
Investment, Identifier [Axis]: LifeStyles Bidco Ltd., Lifestyles Intermediate Holdco Ltd. and LifeStyles Parent, L.P., Class B common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.1 [3],[4]   $ 1.1 [3],[4]   $ 0.0 [7],[8]                
Investment, Identifier [Axis]: LifeStyles Bidco Ltd., Lifestyles Intermediate Holdco Ltd. and LifeStyles Parent, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1214.00% [5]   1214.00% [5]   11.15% [1] 1214.00% [5] 1214.00% [5] 1214.00% [5] 1214.00% [5] 11.15% [1] 11.15% [1] 11.15% [1] 11.15% [1]
Total first lien senior secured loans $ 18.5 [2],[3],[4]   $ 18.5 [2],[3],[4]   $ 18.6 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 18.5 [2],[3],[4]   18.5 [2],[3],[4]   18.2 [6],[7],[8]                
Investment, Identifier [Axis]: LifeStyles Bidco Ltd., Lifestyles Intermediate Holdco Ltd. and LifeStyles Parent, L.P., Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.4 [3],[4]   $ 3.4 [3],[4]   $ 3.2 [7],[8]                
Investment, Identifier [Axis]: Lifescan Global Corporation, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1125.00% [5]   1125.00% [5]   9.74% [1] 1125.00% [5] 1125.00% [5] 1125.00% [5] 1125.00% [5] 9.74% [1] 9.74% [1] 9.74% [1] 9.74% [1]
Total first lien senior secured loans $ 12.9 [2],[3],[10]   $ 12.9 [2],[3],[10]   $ 14.3 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 10.1 [2],[3],[10]   10.1 [2],[3],[10]   $ 10.3 [7]                
Investment, Identifier [Axis]: Lifescan Global Corporation, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         13.24%         13.24% 13.24% 13.24% 13.24%
Total first lien senior secured loans 0.2 [3],[10],[12]   0.2 [3],[10],[12]   $ 0.2 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [3],[10],[12]   0.1 [3],[10],[12]   0.2 [7]                
Investment, Identifier [Axis]: Lightbeam Bidco, Inc.                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6   4.6                    
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.3   1.3                    
Less: funded commitments (0.3)   (0.3)                    
Total unfunded commitments 1.0   1.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.0   $ 1.0                    
Investment, Identifier [Axis]: Lightbeam Bidco, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1172.00%   1172.00%     1172.00% 1172.00% 1172.00% 1172.00%        
Total first lien senior secured loans [2],[3] $ 4.6   $ 4.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 4.5   $ 4.5                    
Investment, Identifier [Axis]: Lightbeam Bidco, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1171.00%   1171.00%     1171.00% 1171.00% 1171.00% 1171.00%        
Total first lien senior secured loans [2],[3],[13] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[13] 0.1   0.1                    
Investment, Identifier [Axis]: LiveBarn Inc., Preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[4] 17.3   17.3                    
Investment, Identifier [Axis]: Lower ACS, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 25.9   25.9   25.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 25.9   25.9   25.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 25.9   $ 25.9   $ 25.9                
Investment, Identifier [Axis]: Lower ACS, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   10.13% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 5.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.8 [2],[3]   0.8 [2],[3]   $ 5.4 [6],[7]                
Investment, Identifier [Axis]: MB Aerospace Holdings II Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.23%         8.23% 8.23% 8.23% 8.23%
Total first lien senior secured loans [6],[7]         $ 14.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 12.5                
Investment, Identifier [Axis]: MB Aerospace Holdings II Corp., Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         13.73%         13.73% 13.73% 13.73% 13.73%
Total first lien senior secured loans [6],[7]         $ 68.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 63.6                
Investment, Identifier [Axis]: MB Aerospace Holdings II Corp., Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         13.73%         13.73% 13.73% 13.73% 13.73%
Total first lien senior secured loans [6],[7]         $ 23.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         22.0                
Investment, Identifier [Axis]: ME Equity LLC, Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.4 [3]   4.4 [3]   4.5 [7]                
Investment, Identifier [Axis]: MRI Software LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.5   3.5   10.6                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.5   3.5   10.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.5   $ 3.5   $ 10.6                
Investment, Identifier [Axis]: MRI Software LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1099.00% [5]   1099.00% [5]   10.23% [1] 1099.00% [5] 1099.00% [5] 1099.00% [5] 1099.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 46.7 [2],[3]   $ 46.7 [2],[3]   $ 47.1 [6]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 45.3 [2],[3]   $ 45.3 [2],[3]   $ 45.6 [6]                
Investment, Identifier [Axis]: MRI Software LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1099.00% [5]   1099.00% [5]   10.23% [1] 1099.00% [5] 1099.00% [5] 1099.00% [5] 1099.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 24.2 [2],[3]   $ 24.2 [2],[3]   $ 17.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 23.5 [2],[3]   23.5 [2],[3]   16.8 [6],[7]                
Investment, Identifier [Axis]: MailSouth, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 8.7 [3],[12]   8.7 [3],[12]   8.7 [7],[9]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.9 [3],[12]   0.9 [3],[12]   3.9 [7],[9]                
Investment, Identifier [Axis]: Majesco and Magic Topco, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.0   2.0   2.0                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.0   2.0   2.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.0   2.0   2.0                
Investment, Identifier [Axis]: Majesco and Magic Topco, L.P., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.2 [3]   5.2 [3]   3.6 [7]                
Investment, Identifier [Axis]: Majesco and Magic Topco, L.P., Class B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   $ 0.0                
Investment, Identifier [Axis]: Majesco and Magic Topco, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1277.00% [5]   1277.00% [5]   11.98% [1] 1277.00% [5] 1277.00% [5] 1277.00% [5] 1277.00% [5] 11.98% [1] 11.98% [1] 11.98% [1] 11.98% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 30.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   30.3 [6],[7]                
Investment, Identifier [Axis]: Management Consulting & Research LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         4.0                
Less: funded commitments         0.0                
Total unfunded commitments         4.0                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 4.0                
Investment, Identifier [Axis]: Management Consulting & Research LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.94%         10.94% 10.94% 10.94% 10.94%
Total first lien senior secured loans [6],[7]         $ 1.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         1.0                
Investment, Identifier [Axis]: Manna Pro Products, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.0   7.0   7.0                
Less: funded commitments (5.1)   (5.1)   (5.1)                
Total unfunded commitments 1.9   1.9   1.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.9   $ 1.9   $ 1.9                
Investment, Identifier [Axis]: Manna Pro Products, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.14% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.14% [1] 10.14% [1] 10.14% [1] 10.14% [1]
Total first lien senior secured loans $ 5.1 [2],[3]   $ 5.1 [2],[3]   $ 5.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.7 [2],[3]   4.7 [2],[3]   4.7 [6],[7]                
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc. and Marcone Yellowstone Holdings, LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.0 [3]   $ 8.0 [3]   $ 10.2 [7]                
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc. and Marcone Yellowstone Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 6.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 6.5 [6],[7]                
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc. and Marcone Yellowstone Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.91% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.91% [1] 10.91% [1] 10.91% [1] 10.91% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 2.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [2],[3]   0.2 [2],[3]   $ 2.5 [6],[7]                
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc. and Marcone Yellowstone Holdings, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.94%         10.94% 10.94% 10.94% 10.94%
Total first lien senior secured loans [6],[7]         $ 2.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 2.1                
Investment, Identifier [Axis]: Marcone Yellowstone Buyer Inc. and Marcone Yellowstone Holdings, LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.98%         10.98% 10.98% 10.98% 10.98%
Total first lien senior secured loans [6],[7]         $ 0.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.3                
Investment, Identifier [Axis]: Marmic Purchaser, LLC and Marmic Topco, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.2   4.2   6.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.2   4.2   6.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.2   $ 4.2   $ 6.9                
Investment, Identifier [Axis]: Marmic Purchaser, LLC and Marmic Topco, L.P., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.80% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.80% [1] 10.80% [1] 10.80% [1] 10.80% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.7 [6],[7]                
Investment, Identifier [Axis]: Marmic Purchaser, LLC and Marmic Topco, L.P., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1186.00% [5]   1186.00% [5]   11.04% [1] 1186.00% [5] 1186.00% [5] 1186.00% [5] 1186.00% [5] 11.04% [1] 11.04% [1] 11.04% [1] 11.04% [1]
Total first lien senior secured loans $ 0.8   $ 0.8   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.8   $ 0.8   0.2 [6],[7]                
Investment, Identifier [Axis]: Marmic Purchaser, LLC and Marmic Topco, L.P., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1129.00%   1129.00%     1129.00% 1129.00% 1129.00% 1129.00%        
Total first lien senior secured loans [2],[3] $ 1.6   $ 1.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.6   $ 1.6                    
Investment, Identifier [Axis]: Marmic Purchaser, LLC and Marmic Topco, L.P., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1165.00%   1165.00%     1165.00% 1165.00% 1165.00% 1165.00%        
Total first lien senior secured loans [2],[3] $ 0.9   $ 0.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.9   0.9                    
Investment, Identifier [Axis]: Marmic Purchaser, LLC and Marmic Topco, L.P., Limited partnership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.4 [3]   $ 4.4 [3]   $ 2.6 [7]                
Investment, Identifier [Axis]: Maverick Acquisition, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1164.00% [5]   1164.00% [5]   10.98% [1] 1164.00% [5] 1164.00% [5] 1164.00% [5] 1164.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 27.4 [2],[3]   $ 27.4 [2],[3]   $ 27.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 23.0 [2],[3]   23.0 [2],[3]   25.4 [6],[7]                
Investment, Identifier [Axis]: Mavis Tire Express Services Topco Corp., Metis Holdco, Inc. and Metis Topco, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 32.9   32.9   32.9                
Less: funded commitments (5.3)   (5.3)   (7.3)                
Total unfunded commitments 27.6   27.6   25.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 27.6   27.6   25.6                
Investment, Identifier [Axis]: Mavis Tire Express Services Topco Corp., Metis Holdco, Inc. and Metis Topco, LP, Class A-1 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 34.5 [3]   $ 34.5 [3]   33.1 [7]                
Investment, Identifier [Axis]: Mavis Tire Express Services Topco Corp., Metis Holdco, Inc. and Metis Topco, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 903.00%   903.00%     903.00% 903.00% 903.00% 903.00%        
Total first lien senior secured loans $ 1.6 [3],[13]   $ 1.6 [3],[13]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.6 [3],[13]   1.6 [3],[13]   0.0 [15]                
Investment, Identifier [Axis]: Mavis Tire Express Services Topco Corp., Metis Holdco, Inc. and Metis Topco, LP, Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 81.1 [3]   81.1 [3]   76.6 [7]                
Investment, Identifier [Axis]: McKenzie Creative Brands, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.5   4.5   4.5                
Less: funded commitments (1.4)   (1.4)   (1.9)                
Total unfunded commitments 3.1   3.1   2.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.1   $ 3.1   $ 2.6                
Investment, Identifier [Axis]: McKenzie Creative Brands, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1222.00% [5]   1222.00% [5]   9.43% [1] 1222.00% [5] 1222.00% [5] 1222.00% [5] 1222.00% [5] 9.43% [1] 9.43% [1] 9.43% [1] 9.43% [1]
Total first lien senior secured loans $ 84.5 [2],[3],[20]   $ 84.5 [2],[3],[20]   $ 84.5 [6],[7],[21]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 84.5 [2],[3],[20]   $ 84.5 [2],[3],[20]   $ 84.5 [6],[7],[21]                
Investment, Identifier [Axis]: McKenzie Creative Brands, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1222.00% [5]   1222.00% [5]   10.14% [1] 1222.00% [5] 1222.00% [5] 1222.00% [5] 1222.00% [5] 10.14% [1] 10.14% [1] 10.14% [1] 10.14% [1]
Total first lien senior secured loans $ 5.5 [2],[3]   $ 5.5 [2],[3]   $ 5.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.5 [2],[3]   $ 5.5 [2],[3]   $ 5.5 [6],[7]                
Investment, Identifier [Axis]: McKenzie Creative Brands, LLC, First lien senior secured loan, First Out Tranche                          
Schedule of Investments [Line Items]                          
Coupon 2.00%   2.00%   2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%
Total first lien senior secured loans $ 40.5   $ 40.5   $ 40.9                
Investment, Identifier [Axis]: McKenzie Creative Brands, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1218.00% [5]   1218.00% [5]   10.12% [1] 1218.00% [5] 1218.00% [5] 1218.00% [5] 1218.00% [5] 10.12% [1] 10.12% [1] 10.12% [1] 10.12% [1]
Total first lien senior secured loans $ 1.4 [2],[3]   $ 1.4 [2],[3]   $ 1.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.4 [2],[3]   1.4 [2],[3]   1.9 [6],[7]                
Investment, Identifier [Axis]: McLaren Group Limited, Senior preference shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[8]         26.2                
Investment, Identifier [Axis]: McLaren Group Limited, Warrant to purchase units of ordinary shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[8]         0.8                
Investment, Identifier [Axis]: McLaren Group Limited, Warrant to purchase units of ordinary shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[8]         2.8                
Investment, Identifier [Axis]: Medline Borrower, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.9   6.9   6.9                
Less: funded commitments (0.2)   (0.2)   (0.2)                
Total unfunded commitments 6.7   6.7   6.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 6.7   6.7   6.7                
Investment, Identifier [Axis]: Medline Borrower, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [17]   0.0 [17]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   0.0 [15]                
Investment, Identifier [Axis]: Miami Beckham United LLC, Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 101.0   101.0   94.7                
Investment, Identifier [Axis]: Miami Beckham United LLC, Class B preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 43.5   43.5                    
Investment, Identifier [Axis]: Micromeritics Instrument Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.1   4.1   4.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.1   4.1   4.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.1   $ 4.1   $ 4.1                
Investment, Identifier [Axis]: Micromeritics Instrument Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1009.00% [5]   1009.00% [5]   9.65% [1] 1009.00% [5] 1009.00% [5] 1009.00% [5] 1009.00% [5] 9.65% [1] 9.65% [1] 9.65% [1] 9.65% [1]
Total first lien senior secured loans $ 19.6 [2],[3]   $ 19.6 [2],[3]   $ 20.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 19.6 [2],[3]   19.6 [2],[3]   20.7 [6],[7]                
Investment, Identifier [Axis]: Microstar Logistics LLC, Microstar Global Asset Management LLC, MStar Holding Corporation and Kegstar USA Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.1 [3]   $ 5.1 [3]   $ 6.6 [7]                
Investment, Identifier [Axis]: Microstar Logistics LLC, Microstar Global Asset Management LLC, MStar Holding Corporation and Kegstar USA Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         15.58%         15.58% 15.58% 15.58% 15.58%
Total first lien senior secured loans [6]         $ 159.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6]         159.3                
Investment, Identifier [Axis]: Microstar Logistics LLC, Microstar Global Asset Management LLC, MStar Holding Corporation and Kegstar USA Inc., Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1439.00%   1439.00%     1439.00% 1439.00% 1439.00% 1439.00%        
Total first lien senior secured loans [2],[3] $ 168.3   $ 168.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 168.3   $ 168.3                    
Investment, Identifier [Axis]: Microstar Logistics LLC, Microstar Global Asset Management LLC, MStar Holding Corporation and Kegstar USA Inc., Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1439.00%   1439.00%     1439.00% 1439.00% 1439.00% 1439.00%        
Total first lien senior secured loans [2],[3] $ 8.6   $ 8.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 8.6   8.6                    
Investment, Identifier [Axis]: Microstar Logistics LLC, Microstar Global Asset Management LLC, MStar Holding Corporation and Kegstar USA Inc., Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.3 [3]   3.3 [3]   2.6 [7]                
Investment, Identifier [Axis]: Microstar Logistics LLC, Microstar Global Asset Management LLC, MStar Holding Corporation and Kegstar USA Inc., Series B preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 12.0   12.0                    
Investment, Identifier [Axis]: Mimecast Borrowerco, Inc. and Magnesium Co- Invest SCSp                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 15.1   15.1   15.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 15.1   15.1   15.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 15.1   15.1   $ 15.1                
Investment, Identifier [Axis]: Mimecast Borrowerco, Inc. and Magnesium Co- Invest SCSp 1                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.0   1.0                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.0   1.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.0   $ 1.0                    
Investment, Identifier [Axis]: Mimecast Borrowerco, Inc. and Magnesium Co- Invest SCSp, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1094.00% [5]   1094.00% [5]   10.17% [1] 1094.00% [5] 1094.00% [5] 1094.00% [5] 1094.00% [5] 10.17% [1] 10.17% [1] 10.17% [1] 10.17% [1]
Total first lien senior secured loans $ 34.9 [2],[3],[4]   $ 34.9 [2],[3],[4]   $ 102.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 34.9 [2],[3],[4]   $ 34.9 [2],[3],[4]   $ 99.1 [6],[7],[8]                
Investment, Identifier [Axis]: Mimecast Borrowerco, Inc. and Magnesium Co- Invest SCSp, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1117.00% [5]   1117.00% [5]   9.18% [1] 1117.00% [5] 1117.00% [5] 1117.00% [5] 1117.00% [5] 9.18% [1] 9.18% [1] 9.18% [1] 9.18% [1]
Total first lien senior secured loans $ 101.4 [2],[3],[4]   $ 101.4 [2],[3],[4]   $ 34.8 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 101.4 [2],[3],[4]   101.4 [2],[3],[4]   33.7 [6],[7],[8]                
Investment, Identifier [Axis]: Mimecast Borrowerco, Inc. and Magnesium Co- Invest SCSp, Limited partnership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 43.2 [3],[4]   43.2 [3],[4]   39.4 [7],[8]                
Investment, Identifier [Axis]: Ministry Brands Holdings, LLC and RCP MB Investments B, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 27.6   27.6   31.3                
Less: funded commitments (3.6)   (3.6)   (4.0)                
Total unfunded commitments 24.0   24.0   27.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 24.0   $ 24.0   $ 27.3                
Investment, Identifier [Axis]: Ministry Brands Holdings, LLC and RCP MB Investments B, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   9.88% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 36.0 [2],[3]   $ 36.0 [2],[3]   $ 32.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 34.2 [2],[3]   $ 34.2 [2],[3]   $ 30.9 [6],[7]                
Investment, Identifier [Axis]: Ministry Brands Holdings, LLC and RCP MB Investments B, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   9.88% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 3.6 [2],[3],[13]   $ 3.6 [2],[3],[13]   $ 4.0 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.4 [2],[3],[13]   3.4 [2],[3],[13]   3.8 [6],[7],[14]                
Investment, Identifier [Axis]: Ministry Brands Holdings, LLC and RCP MB Investments B, L.P., Limited partner interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.9 [3]   $ 7.9 [3]   $ 8.8 [7]                
Investment, Identifier [Axis]: Mitchell International, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 918.00%   918.00%     918.00% 918.00% 918.00% 918.00%        
Total first lien senior secured loans [2],[3],[10] $ 0.7   $ 0.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[10] $ 0.7   $ 0.7                    
Investment, Identifier [Axis]: Mitchell International, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1193.00% [5]   1193.00% [5]   11.23% [1] 1193.00% [5] 1193.00% [5] 1193.00% [5] 1193.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 98.1 [2],[3],[10]   $ 98.1 [2],[3],[10]   $ 98.1 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 89.8 [2],[3],[10]   89.8 [2],[3],[10]   81.0 [6],[7],[11]                
Investment, Identifier [Axis]: Modigent, LLC and OMERS PMC Investment Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 16.2   16.2                    
Less: funded commitments (2.2)   (2.2)                    
Total unfunded commitments 14.0   14.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 14.0   14.0                    
Investment, Identifier [Axis]: Modigent, LLC and OMERS PMC Investment Holdings LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 14.3   $ 14.3                    
Investment, Identifier [Axis]: Modigent, LLC and OMERS PMC Investment Holdings LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1139.00%   1139.00%     1139.00% 1139.00% 1139.00% 1139.00%        
Total first lien senior secured loans [2],[3] $ 2.8   $ 2.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 2.8   $ 2.8                    
Investment, Identifier [Axis]: Modigent, LLC and OMERS PMC Investment Holdings LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1350.00%   1350.00%     1350.00% 1350.00% 1350.00% 1350.00%        
Total first lien senior secured loans [2],[3] $ 2.2   $ 2.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 2.2   2.2                    
Investment, Identifier [Axis]: Monica Holdco (US) Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.6   3.6   3.6                
Less: funded commitments (3.6)   (3.6)   (2.4)                
Total unfunded commitments 0.0   0.0   1.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.0   $ 0.0   $ 1.2                
Investment, Identifier [Axis]: Monica Holdco (US) Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1229.00% [5]   1229.00% [5]   11.48% [1] 1229.00% [5] 1229.00% [5] 1229.00% [5] 1229.00% [5] 11.48% [1] 11.48% [1] 11.48% [1] 11.48% [1]
Total first lien senior secured loans $ 2.6 [2],[3]   $ 2.6 [2],[3]   $ 2.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.5 [2],[3]   $ 2.5 [2],[3]   $ 2.5 [6],[7]                
Investment, Identifier [Axis]: Monica Holdco (US) Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1216.00% [5]   1216.00% [5]   10.99% [1] 1216.00% [5] 1216.00% [5] 1216.00% [5] 1216.00% [5] 10.99% [1] 10.99% [1] 10.99% [1] 10.99% [1]
Total first lien senior secured loans $ 3.6 [2],[3]   $ 3.6 [2],[3]   $ 2.4 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.5 [2],[3]   3.5 [2],[3]   2.3 [6],[7],[14]                
Investment, Identifier [Axis]: Monolith Brands Group, Inc., Series A-1 preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 15.5 [3]   15.5 [3]   15.5 [7]                
Investment, Identifier [Axis]: Moon Valley Nursery of Arizona Retail, LLC, Moon Valley Nursery Farm Holdings, LLC, Moon Valley Nursery RE Holdings LLC, and Stonecourt IV Partners, LP, Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 29.9   29.9   42.9                
Investment, Identifier [Axis]: Moonraker AcquisitionCo LLC and Moonraker HoldCo LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.1   10.1   19.0                
Less: funded commitments (0.1)   (0.1)   0.0                
Total unfunded commitments 10.0   10.0   19.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 10.0   10.0   19.0                
Investment, Identifier [Axis]: Moonraker AcquisitionCo LLC and Moonraker HoldCo LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.5   $ 4.5   $ 4.5                
Investment, Identifier [Axis]: Moonraker AcquisitionCo LLC and Moonraker HoldCo LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1108.00% [5]   1108.00% [5]   10.32% [1] 1108.00% [5] 1108.00% [5] 1108.00% [5] 1108.00% [5] 10.32% [1] 10.32% [1] 10.32% [1] 10.32% [1]
Total first lien senior secured loans $ 24.9 [2],[3]   $ 24.9 [2],[3]   $ 25.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 24.9 [2],[3]   $ 24.9 [2],[3]   $ 24.6 [6],[7]                
Investment, Identifier [Axis]: Moonraker AcquisitionCo LLC and Moonraker HoldCo LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1115.00%   1115.00%     1115.00% 1115.00% 1115.00% 1115.00%        
Total first lien senior secured loans [2],[3] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.1   $ 0.1                    
Investment, Identifier [Axis]: Movati Athletic (Group) Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 1139.00% [5]   1139.00% [5]   10.18% [1] 1139.00% [5] 1139.00% [5] 1139.00% [5] 1139.00% [5] 10.18% [1] 10.18% [1] 10.18% [1] 10.18% [1]
Total first lien senior secured loans $ 4.6 [2],[3],[4]   $ 4.6 [2],[3],[4]   $ 4.7 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [2],[3],[4]   4.6 [2],[3],[4]   4.6 [6],[7],[8]                
Investment, Identifier [Axis]: Mr. Greens Intermediate, LLC, Florida Veg Investments LLC, MRG Texas, LLC and Restaurant Produce and Services Blocker, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.3   6.3                    
Less: funded commitments (0.2)   (0.2)                    
Total unfunded commitments 6.1   6.1                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 6.1   6.1                    
Investment, Identifier [Axis]: Mr. Greens Intermediate, LLC, Florida Veg Investments LLC, MRG Texas, LLC and Restaurant Produce and Services Blocker, LLC, Class B limited liability company interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 10.5   $ 10.5                    
Investment, Identifier [Axis]: Mr. Greens Intermediate, LLC, Florida Veg Investments LLC, MRG Texas, LLC and Restaurant Produce and Services Blocker, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1168.00%   1168.00%     1168.00% 1168.00% 1168.00% 1168.00%        
Total first lien senior secured loans [2],[3] $ 9.7   $ 9.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 9.5   9.5                    
Investment, Identifier [Axis]: Mr. Greens Intermediate, LLC, Florida Veg Investments LLC, MRG Texas, LLC and Restaurant Produce and Services Blocker, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [17] 0.0   0.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [17] 0.0   0.0                    
Investment, Identifier [Axis]: Murchison Oil and Gas, LLC and Murchison Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.2   9.2   27.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 9.2   9.2   27.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 9.2   $ 9.2   $ 27.5                
Investment, Identifier [Axis]: Murchison Oil and Gas, LLC and Murchison Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1404.00% [5]   1404.00% [5]   13.08% [1] 1404.00% [5] 1404.00% [5] 1404.00% [5] 1404.00% [5] 13.08% [1] 13.08% [1] 13.08% [1] 13.08% [1]
Total first lien senior secured loans $ 82.9 [2],[3]   $ 82.9 [2],[3]   $ 75.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 82.9 [2],[3]   $ 82.9 [2],[3]   75.5 [6],[7]                
Investment, Identifier [Axis]: Murchison Oil and Gas, LLC and Murchison Holdings, LLC, Preferred units                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 800.00%   800.00%     800.00% 800.00% 800.00% 800.00%        
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 53.1   $ 53.1   45.9                
Investment, Identifier [Axis]: NAS, LLC and Nationwide Marketing Group, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.0   3.0   3.0                
Less: funded commitments (0.6)   (0.6)   (0.6)                
Total unfunded commitments 2.4   2.4   2.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.4   $ 2.4   $ 2.4                
Investment, Identifier [Axis]: NAS, LLC and Nationwide Marketing Group, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   11.23% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 6.2 [2],[3]   $ 6.2 [2],[3]   $ 6.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.2 [2],[3]   $ 6.2 [2],[3]   $ 6.3 [6],[7]                
Investment, Identifier [Axis]: NAS, LLC and Nationwide Marketing Group, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   11.23% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 2.3 [2],[3]   $ 2.3 [2],[3]   $ 2.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.3 [2],[3]   $ 2.3 [2],[3]   $ 2.3 [6],[7]                
Investment, Identifier [Axis]: NAS, LLC and Nationwide Marketing Group, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   11.23% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 1.3 [2],[3]   $ 1.3 [2],[3]   $ 1.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.3 [2],[3]   $ 1.3 [2],[3]   $ 1.3 [6],[7]                
Investment, Identifier [Axis]: NAS, LLC and Nationwide Marketing Group, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1204.00% [5]   1204.00% [5]   11.23% [1] 1204.00% [5] 1204.00% [5] 1204.00% [5] 1204.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 0.6 [2],[3]   $ 0.6 [2],[3]   $ 0.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.6 [2],[3]   0.6 [2],[3]   0.6 [6],[7]                
Investment, Identifier [Axis]: NCWS Intermediate, Inc. and NCWS Holdings LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 11.5   11.5   28.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 11.5   11.5   28.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 11.5   11.5   28.1                
Investment, Identifier [Axis]: NCWS Intermediate, Inc. and NCWS Holdings LP, Class A-2 common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 27.4 [3]   $ 27.4 [3]   $ 18.5 [7]                
Investment, Identifier [Axis]: NCWS Intermediate, Inc. and NCWS Holdings LP, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1152.00% [5]   1152.00% [5]   10.38% [1] 1152.00% [5] 1152.00% [5] 1152.00% [5] 1152.00% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 97.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 95.1 [6],[7]                
Investment, Identifier [Axis]: NCWS Intermediate, Inc. and NCWS Holdings LP, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1152.00% [5]   1152.00% [5]   10.38% [1] 1152.00% [5] 1152.00% [5] 1152.00% [5] 1152.00% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 96.3 [2],[3]   $ 96.3 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 96.3 [2],[3]   $ 96.3 [2],[3]   0.2 [6],[7]                
Investment, Identifier [Axis]: NCWS Intermediate, Inc. and NCWS Holdings LP, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1202.00%   1202.00%     1202.00% 1202.00% 1202.00% 1202.00%        
Total first lien senior secured loans [2],[3] $ 8.3   $ 8.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 8.3   8.3                    
Investment, Identifier [Axis]: NMC Skincare Intermediate Holdings II, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.7   12.7   12.7                
Less: funded commitments (1.3)   (1.3)   0.0                
Total unfunded commitments 11.4   11.4   12.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 11.4   $ 11.4   $ 12.7                
Investment, Identifier [Axis]: NMC Skincare Intermediate Holdings II, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1043.00% [5]   1043.00% [5]   9.38% [1] 1043.00% [5] 1043.00% [5] 1043.00% [5] 1043.00% [5] 9.38% [1] 9.38% [1] 9.38% [1] 9.38% [1]
Total first lien senior secured loans $ 31.7 [2],[3]   $ 31.7 [2],[3]   $ 32.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 29.5 [2],[3]   $ 29.5 [2],[3]   $ 30.7 [6],[7]                
Investment, Identifier [Axis]: NMC Skincare Intermediate Holdings II, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1043.00% [5]   1043.00% [5]   9.38% [1] 1043.00% [5] 1043.00% [5] 1043.00% [5] 1043.00% [5] 9.38% [1] 9.38% [1] 9.38% [1] 9.38% [1]
Total first lien senior secured loans $ 4.7 [2],[3]   $ 4.7 [2],[3]   $ 4.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.3 [2],[3]   $ 4.3 [2],[3]   4.5 [6],[7]                
Investment, Identifier [Axis]: NMC Skincare Intermediate Holdings II, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1042.00%   1042.00%     1042.00% 1042.00% 1042.00% 1042.00%        
Total first lien senior secured loans [2],[3] $ 1.3   $ 1.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.2   1.2                    
Investment, Identifier [Axis]: NMN Holdings III Corp. and NMN Holdings LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.5   12.5   12.5                
Less: funded commitments (4.6)   (4.6)   (3.1)                
Total unfunded commitments 7.9   7.9   9.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 7.9   $ 7.9   $ 9.4                
Investment, Identifier [Axis]: NMN Holdings III Corp. and NMN Holdings LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 918.00% [5]   918.00% [5]   8.13% [1] 918.00% [5] 918.00% [5] 918.00% [5] 918.00% [5] 8.13% [1] 8.13% [1] 8.13% [1] 8.13% [1]
Total first lien senior secured loans $ 3.8 [3],[13]   $ 3.8 [3],[13]   $ 2.3 [7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.6 [3],[13]   3.6 [3],[13]   2.1 [7],[14]                
Investment, Identifier [Axis]: NMN Holdings III Corp. and NMN Holdings LP, Partnership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.9 [3]   3.9 [3]   2.0 [7]                
Investment, Identifier [Axis]: NSPC Intermediate Corp. and NSPC Holdings, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: Napa Management Services Corporation and ASP NAPA Holdings, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.5 [3]   3.5 [3]   3.6 [7]                
Investment, Identifier [Axis]: Napa Management Services Corporation and ASP NAPA Holdings, LLC, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [3]   0.2 [3]   0.2 [7]                
Investment, Identifier [Axis]: Napa Management Services Corporation and ASP NAPA Holdings, LLC, Senior preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.3 [3]   0.3 [3]   0.3 [7]                
Investment, Identifier [Axis]: National College of Business and Technology Inc. & Leeds IV Advisors, Inc., Common stock 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: National College of Business and Technology Inc. & Leeds IV Advisors, Inc., Common stock 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: National College of Business and Technology Inc. & Leeds IV Advisors, Inc., Senior preferred series A-1 shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         46.5                
Investment, Identifier [Axis]: National College of Business and Technology Inc. & Leeds IV Advisors, Inc., Series B preferred stock 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: National College of Business and Technology Inc. & Leeds IV Advisors, Inc., Series B preferred stock 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: National College of Business and Technology Inc. & Leeds IV Advisors, Inc., Series C preferred stock 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: National College of Business and Technology Inc. & Leeds IV Advisors, Inc., Series C preferred stock 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: National Intergovernmental Purchasing Alliance Company                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         9.0                
Less: funded commitments         (1.2)                
Total unfunded commitments         7.8                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 7.8                
Investment, Identifier [Axis]: National Intergovernmental Purchasing Alliance Company, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         7.12%         7.12% 7.12% 7.12% 7.12%
Total first lien senior secured loans [7]         $ 1.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         1.2                
Investment, Identifier [Axis]: Navisun LLC and Navisun Holdings LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)         0.0                
Redemptions (cost)         131.0                
Sales (cost)         0.0                
Interest income         0.4                
Capital structuring service fees         0.0                
Dividend income         0.1                
Other income         0.0                
Net realized gains (losses):         19.0                
Net unrealized gains (losses):         (9.4)                
Fair Value         0.0                
Investment, Identifier [Axis]: Nelipak Holding Company, Nelipak European Holdings Cooperatief U.A., KNPAK Holdings, LP and PAKNK Netherlands Treasury B.V.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.6   0.6   0.6                
Less: funded commitments 0.0   0.0   (0.1)                
Total unfunded commitments 0.6   0.6   0.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.6   0.6   0.5                
Investment, Identifier [Axis]: Nelipak Holding Company, Nelipak European Holdings Cooperatief U.A., KNPAK Holdings, LP and PAKNK Netherlands Treasury B.V., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.1 [3],[4]   $ 9.1 [3],[4]   $ 7.5 [7],[8]                
Investment, Identifier [Axis]: Nelipak Holding Company, Nelipak European Holdings Cooperatief U.A., KNPAK Holdings, LP and PAKNK Netherlands Treasury B.V., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 821.00% [5]   821.00% [5]   8.66% [1] 821.00% [5] 821.00% [5] 821.00% [5] 821.00% [5] 8.66% [1] 8.66% [1] 8.66% [1] 8.66% [1]
Total first lien senior secured loans $ 4.7 [3],[4]   $ 4.7 [3],[4]   $ 14.9 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.7 [3],[4]   $ 4.7 [3],[4]   $ 14.6 [6],[7],[8]                
Investment, Identifier [Axis]: Nelipak Holding Company, Nelipak European Holdings Cooperatief U.A., KNPAK Holdings, LP and PAKNK Netherlands Treasury B.V., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 977.00% [5]   977.00% [5]   6.11% [1] 977.00% [5] 977.00% [5] 977.00% [5] 977.00% [5] 6.11% [1] 6.11% [1] 6.11% [1] 6.11% [1]
Total first lien senior secured loans $ 14.8 [3],[4]   $ 14.8 [3],[4]   $ 4.8 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 14.8 [3],[4]   $ 14.8 [3],[4]   $ 4.7 [7],[8]                
Investment, Identifier [Axis]: Nelipak Holding Company, Nelipak European Holdings Cooperatief U.A., KNPAK Holdings, LP and PAKNK Netherlands Treasury B.V., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 821.00% [5]   821.00% [5]   6.11% [1] 821.00% [5] 821.00% [5] 821.00% [5] 821.00% [5] 6.11% [1] 6.11% [1] 6.11% [1] 6.11% [1]
Total first lien senior secured loans $ 1.5 [3],[4]   $ 1.5 [3],[4]   $ 1.5 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.5 [3],[4]   1.5 [3],[4]   $ 1.5 [7],[8]                
Investment, Identifier [Axis]: Nelipak Holding Company, Nelipak European Holdings Cooperatief U.A., KNPAK Holdings, LP and PAKNK Netherlands Treasury B.V., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.66%         8.66% 8.66% 8.66% 8.66%
Total first lien senior secured loans [6],[7],[8]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         0.1                
Investment, Identifier [Axis]: Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.6   12.6   12.6                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 12.6   12.6   12.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 12.6   $ 12.6   $ 12.6                
Investment, Identifier [Axis]: Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1015.00% [5]   1015.00% [5]   8.82% [1] 1015.00% [5] 1015.00% [5] 1015.00% [5] 1015.00% [5] 8.82% [1] 8.82% [1] 8.82% [1] 8.82% [1]
Total first lien senior secured loans $ 81.7 [2],[3]   $ 81.7 [2],[3]   $ 99.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 73.5 [2],[3]   $ 73.5 [2],[3]   $ 88.4 [6],[7]                
Investment, Identifier [Axis]: Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 864.00% [5]   864.00% [5]   8.57% [1] 864.00% [5] 864.00% [5] 864.00% [5] 864.00% [5] 8.57% [1] 8.57% [1] 8.57% [1] 8.57% [1]
Total first lien senior secured loans $ 9.8 [3],[10]   $ 9.8 [3],[10]   $ 74.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.3 [3],[10]   $ 9.3 [3],[10]   $ 65.9 [6],[7]                
Investment, Identifier [Axis]: Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1040.00% [5]   1040.00% [5]   6.25% [1] 1040.00% [5] 1040.00% [5] 1040.00% [5] 1040.00% [5] 6.25% [1] 6.25% [1] 6.25% [1] 6.25% [1]
Total first lien senior secured loans $ 99.0 [2],[3],[10]   $ 99.0 [2],[3],[10]   $ 16.2 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 88.9 [2],[3],[10]   $ 88.9 [2],[3],[10]   $ 14.4 [7]                
Investment, Identifier [Axis]: Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P., First lien senior secured note                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 929.00%   929.00%     929.00% 929.00% 929.00% 929.00%        
Total first lien senior secured loans [3],[10] $ 52.8   $ 52.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[10] 47.9   47.9                    
Investment, Identifier [Axis]: Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P., First lien senior secured notes                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         929.00%         929.00% 929.00% 929.00% 929.00%
Total first lien senior secured loans [7],[11]         $ 52.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[11]         49.8                
Investment, Identifier [Axis]: Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P., Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.6 [3]   $ 4.6 [3]   $ 4.0 [7]                
Investment, Identifier [Axis]: Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1515.00% [5]   1515.00% [5]   13.57% [1] 1515.00% [5] 1515.00% [5] 1515.00% [5] 1515.00% [5] 13.57% [1] 13.57% [1] 13.57% [1] 13.57% [1]
Total first lien senior secured loans $ 221.3 [2],[3]   $ 221.3 [2],[3]   $ 221.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 208.0 [2],[3]   208.0 [2],[3]   214.7 [6],[7]                
Investment, Identifier [Axis]: Nest Topco Borrower Inc., KKR Nest Co-Invest L.P., and NBLY 2021-1                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         119.1                
Less: funded commitments         0.0                
Total unfunded commitments         119.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         119.1                
Investment, Identifier [Axis]: Nest Topco Borrower Inc., KKR Nest Co-Invest L.P., and NBLY 2021-1, Limited partner interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.0 [3]   $ 10.0 [3]   $ 10.2 [7]                
Investment, Identifier [Axis]: Nest Topco Borrower Inc., KKR Nest Co-Invest L.P., and NBLY 2021-1, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1600.00% [5]   1600.00% [5]   13.26% [1] 1600.00% [5] 1600.00% [5] 1600.00% [5] 1600.00% [5] 13.26% [1] 13.26% [1] 13.26% [1] 13.26% [1]
Total first lien senior secured loans $ 119.1 [2],[3]   $ 119.1 [2],[3]   $ 119.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 119.1 [2],[3]   $ 119.1 [2],[3]   $ 117.9 [6],[7]                
Investment, Identifier [Axis]: Netsmart, Inc. and Netsmart Technologies, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 943.00%   943.00%     943.00% 943.00% 943.00% 943.00%        
Total first lien senior secured loans [2],[3],[10] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[10] $ 0.2   $ 0.2                    
Investment, Identifier [Axis]: New Era Cap, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.94%         9.94% 9.94% 9.94% 9.94%
Total first lien senior secured loans [6],[7]         $ 27.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         27.8                
Investment, Identifier [Axis]: Noble Aerospace, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         5.6                
Less: funded commitments         (2.2)                
Total unfunded commitments         3.4                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         3.4                
Investment, Identifier [Axis]: Noble Aerospace, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [15]         0.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [15]         0.0                
Investment, Identifier [Axis]: Nomi Health, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1384.00%   1384.00%     1384.00% 1384.00% 1384.00% 1384.00%        
Total first lien senior secured loans [2],[3] $ 11.4   $ 11.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 11.1   11.1                    
Investment, Identifier [Axis]: Nomi Health, Inc., Warrant to purchase shares of Series B preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: North American Fire Holdings, LLC and North American Fire Ultimate Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.7   2.7   8.1                
Less: funded commitments (0.5)   (0.5)   0.0                
Total unfunded commitments 2.2   2.2   8.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.2   2.2   8.1                
Investment, Identifier [Axis]: North American Fire Holdings, LLC and North American Fire Ultimate Holdings, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.8 [3]   $ 3.8 [3]   $ 2.9 [7]                
Investment, Identifier [Axis]: North American Fire Holdings, LLC and North American Fire Ultimate Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   10.23% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 19.8 [2],[3]   $ 19.8 [2],[3]   $ 20.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 19.8 [2],[3]   $ 19.8 [2],[3]   $ 20.0 [6],[7]                
Investment, Identifier [Axis]: North American Fire Holdings, LLC and North American Fire Ultimate Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1103.00% [5]   1103.00% [5]   10.08% [1] 1103.00% [5] 1103.00% [5] 1103.00% [5] 1103.00% [5] 10.08% [1] 10.08% [1] 10.08% [1] 10.08% [1]
Total first lien senior secured loans $ 6.8 [2],[3]   $ 6.8 [2],[3]   $ 2.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.8 [2],[3]   $ 6.8 [2],[3]   2.9 [6],[7]                
Investment, Identifier [Axis]: North American Fire Holdings, LLC and North American Fire Ultimate Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1096.00%   1096.00%     1096.00% 1096.00% 1096.00% 1096.00%        
Total first lien senior secured loans [2],[3] $ 0.5   $ 0.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.5   0.5                    
Investment, Identifier [Axis]: North American Science Associates, LLC, Cardinal Purchaser LLC and Cardinal Topco Holdings, L.P., Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 38.3 [3]   $ 38.3 [3]   $ 38.8 [7]                
Investment, Identifier [Axis]: North American Science Associates, LLC, Cardinal Purchaser LLC and Cardinal Topco Holdings, L.P., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1106.00% [5]   1106.00% [5]   10.18% [1] 1106.00% [5] 1106.00% [5] 1106.00% [5] 1106.00% [5] 10.18% [1] 10.18% [1] 10.18% [1] 10.18% [1]
Total first lien senior secured loans $ 47.2 [2],[3]   $ 47.2 [2],[3]   $ 47.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 47.2 [2],[3]   $ 47.2 [2],[3]   $ 47.5 [6],[7]                
Investment, Identifier [Axis]: North American Science Associates, LLC, Cardinal Purchaser LLC and Cardinal Topco Holdings, L.P., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1106.00% [5]   1106.00% [5]   10.18% [1] 1106.00% [5] 1106.00% [5] 1106.00% [5] 1106.00% [5] 10.18% [1] 10.18% [1] 10.18% [1] 10.18% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 2.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 2.6 [6],[7]                
Investment, Identifier [Axis]: North American Science Associates, LLC, Cardinal Purchaser LLC and Cardinal Topco Holdings, L.P., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1106.00% [5]   1106.00% [5]   10.18% [1] 1106.00% [5] 1106.00% [5] 1106.00% [5] 1106.00% [5] 10.18% [1] 10.18% [1] 10.18% [1] 10.18% [1]
Total first lien senior secured loans $ 2.5 [2],[3]   $ 2.5 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.5 [2],[3]   $ 2.5 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: North American Science Associates, LLC, Cardinal Purchaser LLC and Cardinal Topco Holdings, L.P., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1106.00% [5]   1106.00% [5]   10.18% [1] 1106.00% [5] 1106.00% [5] 1106.00% [5] 1106.00% [5] 10.18% [1] 10.18% [1] 10.18% [1] 10.18% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: North American Science Associates, LLC, Cardinal Purchaser LLC and Cardinal Topco Holdings, L.P., Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3] 1.5   1.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 1.5   1.5                    
Investment, Identifier [Axis]: North Haven Fairway Buyer, LLC, Fairway Lawns, LLC and Command Pest Control, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.9   8.9   22.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 8.9   8.9   22.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 8.9   $ 8.9   $ 22.5                
Investment, Identifier [Axis]: North Haven Fairway Buyer, LLC, Fairway Lawns, LLC and Command Pest Control, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1188.00% [5]   1188.00% [5]   11.05% [1] 1188.00% [5] 1188.00% [5] 1188.00% [5] 1188.00% [5] 11.05% [1] 11.05% [1] 11.05% [1] 11.05% [1]
Total first lien senior secured loans $ 14.4 [2],[3]   $ 14.4 [2],[3]   $ 6.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 14.4 [2],[3]   14.4 [2],[3]   6.2 [6],[7]                
Investment, Identifier [Axis]: North Haven Falcon Buyer, LLC and North Haven Falcon Holding Company, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         3.5                
Less: funded commitments         0.0                
Total unfunded commitments         3.5                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         3.5                
Investment, Identifier [Axis]: North Haven Falcon Buyer, LLC and North Haven Falcon Holding Company, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.3   $ 0.3   $ 1.8                
Investment, Identifier [Axis]: North Haven Falcon Buyer, LLC and North Haven Falcon Holding Company, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 13.54% [5]   13.54% [5]   11.19% [1] 13.54% [5] 13.54% [5] 13.54% [5] 13.54% [5] 11.19% [1] 11.19% [1] 11.19% [1] 11.19% [1]
Total first lien senior secured loans $ 26.0 [2],[3]   $ 26.0 [2],[3]   $ 25.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 22.6 [2],[3]   22.6 [2],[3]   23.5 [6],[7]                
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.4   10.4   5.1                
Less: funded commitments (1.1)   (1.1)   (0.8)                
Total unfunded commitments 9.3   9.3   4.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 9.3   $ 9.3   $ 4.3                
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1102.00% [5]   1102.00% [5]   9.90% [1] 1102.00% [5] 1102.00% [5] 1102.00% [5] 1102.00% [5] 9.90% [1] 9.90% [1] 9.90% [1] 9.90% [1]
Total first lien senior secured loans $ 7.9 [2],[3]   $ 7.9 [2],[3]   $ 6.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.9 [2],[3]   $ 7.9 [2],[3]   $ 6.7 [6],[7]                
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.92%         9.92% 9.92% 9.92% 9.92%
Total first lien senior secured loans [6],[7]         $ 0.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.8                
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1103.00%   1103.00%     1103.00% 1103.00% 1103.00% 1103.00%        
Total first lien senior secured loans [2],[3] $ 0.9   $ 0.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.9   $ 0.9                    
Investment, Identifier [Axis]: North Haven Stack Buyer, LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1300.00%   1300.00%     1300.00% 1300.00% 1300.00% 1300.00%        
Total first lien senior secured loans [2],[3] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.2   0.2                    
Investment, Identifier [Axis]: Northwinds Holding, Inc. and Northwinds Services Group LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.7   12.7                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 12.7   12.7                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 12.7   12.7                    
Investment, Identifier [Axis]: Northwinds Holding, Inc. and Northwinds Services Group LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 2.9   $ 2.9                    
Investment, Identifier [Axis]: Northwinds Holding, Inc. and Northwinds Services Group LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1181.00%   1181.00%     1181.00% 1181.00% 1181.00% 1181.00%        
Total first lien senior secured loans [2],[3] $ 21.5   $ 21.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 20.9   20.9                    
Investment, Identifier [Axis]: Novipax Buyer, L.L.C. and Novipax Parent Holding Company, L.L.C., Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.8 [3]   5.8 [3]   9.2 [7]                
Investment, Identifier [Axis]: Novipax Buyer, L.L.C. and Novipax Parent Holding Company, L.L.C., Class C units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   $ 0.0                
Investment, Identifier [Axis]: Novipax Buyer, L.L.C. and Novipax Parent Holding Company, L.L.C., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1217.00% [5]   1217.00% [5]   11.17% [1] 1217.00% [5] 1217.00% [5] 1217.00% [5] 1217.00% [5] 11.17% [1] 11.17% [1] 11.17% [1] 11.17% [1]
Total first lien senior secured loans $ 22.8 [2],[3]   $ 22.8 [2],[3]   $ 23.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 22.5 [2],[3]   $ 22.5 [2],[3]   $ 23.5 [6],[7]                
Investment, Identifier [Axis]: Novipax Buyer, L.L.C. and Novipax Parent Holding Company, L.L.C., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1217.00% [5]   1217.00% [5]   11.17% [1] 1217.00% [5] 1217.00% [5] 1217.00% [5] 1217.00% [5] 11.17% [1] 11.17% [1] 11.17% [1] 11.17% [1]
Total first lien senior secured loans $ 0.3 [2],[3]   $ 0.3 [2],[3]   $ 6.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.3 [2],[3]   0.3 [2],[3]   $ 6.3 [6],[7]                
Investment, Identifier [Axis]: OMH-HealthEdge Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.0   0.0                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.0   0.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.0   $ 0.0                    
Investment, Identifier [Axis]: OMH-HealthEdge Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1275.00% [5]   1275.00% [5]   10.02% [1] 1275.00% [5] 1275.00% [5] 1275.00% [5] 1275.00% [5] 10.02% [1] 10.02% [1] 10.02% [1] 10.02% [1]
Total first lien senior secured loans $ 25.7 [2],[3]   $ 25.7 [2],[3]   $ 25.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 25.7 [2],[3]   $ 25.7 [2],[3]   $ 25.9 [6],[7]                
Investment, Identifier [Axis]: OMH-HealthEdge Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1275.00% [5]   1275.00% [5]   10.02% [1] 1275.00% [5] 1275.00% [5] 1275.00% [5] 1275.00% [5] 10.02% [1] 10.02% [1] 10.02% [1] 10.02% [1]
Total first lien senior secured loans $ 15.1 [2],[3]   $ 15.1 [2],[3]   $ 15.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 15.1 [2],[3]   $ 15.1 [2],[3]   $ 15.2 [6],[7]                
Investment, Identifier [Axis]: OMH-HealthEdge Holdings, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1275.00% [5]   1275.00% [5]   10.02% [1] 1275.00% [5] 1275.00% [5] 1275.00% [5] 1275.00% [5] 10.02% [1] 10.02% [1] 10.02% [1] 10.02% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: OTG Management, LLC, Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 9.9 [3]   9.9 [3]   13.1 [7]                
Investment, Identifier [Axis]: OTG Management, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: OTG Management, LLC, Warrant to purchase common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 0.0   $ 0.0                    
Investment, Identifier [Axis]: OTG Management, LLC, Warrant to purchase of common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         $ 0.0                
Investment, Identifier [Axis]: OUTFRONT Media Inc., Series A convertible perpetual preferred stock                          
Schedule of Investments [Line Items]                          
Coupon | Rate 700.00% [5]   700.00% [5]   700.00% [1] 700.00% [5] 700.00% [5] 700.00% [5] 700.00% [5] 700.00% [1] 700.00% [1] 700.00% [1] 700.00% [1]
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 26.3 [3],[4]   $ 26.3 [3],[4]   $ 33.6 [7],[8]                
Investment, Identifier [Axis]: Offen, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         5.6                
Less: funded commitments         0.0                
Total unfunded commitments         5.6                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 5.6                
Investment, Identifier [Axis]: Offen, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1046.00% [5]   1046.00% [5]   8.51% [1] 1046.00% [5] 1046.00% [5] 1046.00% [5] 1046.00% [5] 8.51% [1] 8.51% [1] 8.51% [1] 8.51% [1]
Total first lien senior secured loans $ 0.1 [3]   $ 0.1 [3]   $ 1.4 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [3]   0.1 [3]   1.4 [7]                
Investment, Identifier [Axis]: Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     4.2   8.3                
Redemptions (cost)     0.1   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   3.2                
Capital structuring service fees     0.0   0.3                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (6.7)   (11.7)                
Fair Value 42.1   42.1   44.7                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.6   1.6   1.6                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 1.6   1.6   1.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   (1.6)                
Total net adjusted unfunded revolving and delayed draw loan commitments 1.6   1.6   0.0                
Investment, Identifier [Axis]: Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   0.0                
Investment, Identifier [Axis]: Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 13.05%   13.05%     13.05% 13.05% 13.05% 13.05%        
Total first lien senior secured loans $ 2.4 [2],[3]   $ 2.4 [2],[3]   50.9 [9]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.4 [2],[3]   2.4 [2],[3]   38.1 [9]                
Investment, Identifier [Axis]: Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 55.1 [3],[12]   55.1 [3],[12]   8.7 [7],[9]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 33.0 [3],[12]   33.0 [3],[12]   6.6 [7],[9]                
Investment, Identifier [Axis]: Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3],[12] 11.2   11.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[12] 6.7   6.7                    
Investment, Identifier [Axis]: Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC, Preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: OneDigital Borrower LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.5   7.5   7.5                
Less: funded commitments (1.8)   (1.8)   (0.4)                
Total unfunded commitments 5.7   5.7   7.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.7   $ 5.7   7.1                
Investment, Identifier [Axis]: OneDigital Borrower LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1125.00%   1125.00%     1125.00% 1125.00% 1125.00% 1125.00%        
Total first lien senior secured loans $ 1.3 [3],[13]   $ 1.3 [3],[13]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.3 [3],[13]   1.3 [3],[13]   0.0 [15]                
Investment, Identifier [Axis]: Opal Fuels Intermediate HoldCo LLC, and Opal Fuels Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.1   0.1                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.1   0.1                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 0.1   0.1                    
Investment, Identifier [Axis]: Opal Fuels Intermediate HoldCo LLC, and Opal Fuels Inc., Class A common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [4] $ 25.1   $ 25.1                    
Investment, Identifier [Axis]: Opal Fuels LLC and Opal Fuels Inc., Class A common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [8],[11]         22.3                
Investment, Identifier [Axis]: Opal Fuels LLC and Opal Fuels Inc., Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [8]         28.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [8]         $ 28.5                
Investment, Identifier [Axis]: OpenMarket Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1190.00% [5]   1190.00% [5]   10.98% [1] 1190.00% [5] 1190.00% [5] 1190.00% [5] 1190.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 14.8 [2],[3],[4]   $ 14.8 [2],[3],[4]   $ 51.6 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 14.8 [2],[3],[4]   $ 14.8 [2],[3],[4]   $ 51.1 [6],[7],[8]                
Investment, Identifier [Axis]: Osmose Utilities Services, Inc. and Pine Intermediate Holding LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1220.00% [5]   1220.00% [5]   11.13% [1] 1220.00% [5] 1220.00% [5] 1220.00% [5] 1220.00% [5] 11.13% [1] 11.13% [1] 11.13% [1] 11.13% [1]
Total first lien senior secured loans $ 55.3 [2],[3]   $ 55.3 [2],[3]   $ 55.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 54.7 [2],[3]   54.7 [2],[3]   51.4 [6],[7]                
Investment, Identifier [Axis]: PCG-Ares Sidecar Investment II, L.P.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.1                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     1.8   4.2                
Fair Value 17.4   17.4   15.5                
Investment, Identifier [Axis]: PCG-Ares Sidecar Investment II, L.P., Limited partnership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 17.4 [3],[4]   17.4 [3],[4]   15.5 [7],[8]                
Investment, Identifier [Axis]: PCG-Ares Sidecar Investment, L.P.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   (0.6)                
Fair Value 0.7   0.7   0.7                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 50.0   50.0                    
Less: funded commitments (12.4)   (12.4)                    
Total unfunded commitments 37.6   37.6                    
Less: commitments substantially at discretion of the Company 37.6   37.6                    
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0                    
Investment, Identifier [Axis]: PCG-Ares Sidecar Investment, L.P. and PCG-Ares Sidecar Investment II, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         50.0                
Less: funded commitments         (12.5)                
Total unfunded commitments         37.5                
Less: commitments substantially at discretion of the Company         37.5                
Total net adjusted unfunded revolving and delayed draw loan commitments         0.0                
Investment, Identifier [Axis]: PCG-Ares Sidecar Investment, L.P., Limited partnership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.7 [4]   0.7 [4]   0.7 [8]                
Investment, Identifier [Axis]: PCIA SPV-3, LLC and ASE Royal Aggregator, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.5   3.5                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 3.5   3.5                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.5   $ 3.5                    
Investment, Identifier [Axis]: PCIA SPV-3, LLC and ASE Royal Aggregator, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1162.00%   1162.00%     1162.00% 1162.00% 1162.00% 1162.00%        
Total first lien senior secured loans [2],[3],[4] $ 5.9   $ 5.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 5.7   5.7                    
Investment, Identifier [Axis]: PCIA SPV-3, LLC and ASE Royal Aggregator, LLC, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [4] 6.4   6.4                    
Investment, Identifier [Axis]: PDDS HoldCo, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.9   2.9   2.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.9   2.9   2.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.9   $ 2.9   $ 2.1                
Investment, Identifier [Axis]: PDDS HoldCo, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1303.00% [5]   1303.00% [5]   12.30% [1] 1303.00% [5] 1303.00% [5] 1303.00% [5] 1303.00% [5] 12.30% [1] 12.30% [1] 12.30% [1] 12.30% [1]
Total first lien senior secured loans $ 10.5 [2],[3]   $ 10.5 [2],[3]   $ 9.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 10.5 [2],[3]   10.5 [2],[3]   9.2 [6],[7]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.6   7.6   7.6                
Less: funded commitments (7.6)   (7.6)   (6.1)                
Total unfunded commitments 0.0   0.0   1.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0   1.5                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.2 [3]   $ 3.2 [3]   $ 2.7 [7]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 998.00% [5]   998.00% [5]   8.73% [1] 998.00% [5] 998.00% [5] 998.00% [5] 998.00% [5] 8.73% [1] 8.73% [1] 8.73% [1] 8.73% [1]
Total first lien senior secured loans $ 52.5 [2],[3]   $ 52.5 [2],[3]   $ 52.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 52.0 [2],[3]   $ 52.0 [2],[3]   $ 51.9 [6],[7]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 997.00% [5]   997.00% [5]   8.82% [1] 997.00% [5] 997.00% [5] 997.00% [5] 997.00% [5] 8.82% [1] 8.82% [1] 8.82% [1] 8.82% [1]
Total first lien senior secured loans $ 7.6 [2],[3]   $ 7.6 [2],[3]   $ 6.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.5 [2],[3]   $ 7.5 [2],[3]   $ 6.0 [6],[7]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1403.00% [5]   1403.00% [5]   13.18% [1] 1403.00% [5] 1403.00% [5] 1403.00% [5] 1403.00% [5] 13.18% [1] 13.18% [1] 13.18% [1] 13.18% [1]
Total first lien senior secured loans $ 70.1 [2],[3]   $ 70.1 [2],[3]   $ 70.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 69.4 [2],[3]   $ 69.4 [2],[3]   $ 68.7 [6],[7]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1403.00% [5]   1403.00% [5]   13.18% [1] 1403.00% [5] 1403.00% [5] 1403.00% [5] 1403.00% [5] 13.18% [1] 13.18% [1] 13.18% [1] 13.18% [1]
Total first lien senior secured loans $ 8.3 [2],[3]   $ 8.3 [2],[3]   $ 8.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.2 [2],[3]   $ 8.2 [2],[3]   $ 8.6 [6],[7]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, Second lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1406.00% [5]   1406.00% [5]   13.18% [1] 1406.00% [5] 1406.00% [5] 1406.00% [5] 1406.00% [5] 13.18% [1] 13.18% [1] 13.18% [1] 13.18% [1]
Total first lien senior secured loans $ 8.7 [2],[3]   $ 8.7 [2],[3]   $ 8.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.7 [2],[3]   $ 8.7 [2],[3]   $ 8.1 [6],[7]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, Second lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1424.00% [5]   1424.00% [5]   13.18% [1] 1424.00% [5] 1424.00% [5] 1424.00% [5] 1424.00% [5] 13.18% [1] 13.18% [1] 13.18% [1] 13.18% [1]
Total first lien senior secured loans $ 7.2 [2],[3]   $ 7.2 [2],[3]   $ 7.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.1 [2],[3]   $ 7.1 [2],[3]   7.1 [6],[7]                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, Second lien senior secured loan 5                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1403.00%   1403.00%     1403.00% 1403.00% 1403.00% 1403.00%        
Total first lien senior secured loans [2],[3] $ 6.9   $ 6.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 6.8   6.8                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC, Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 24.9 [3]   24.9 [3]   21.2 [7]                
Investment, Identifier [Axis]: PS Operating Company LLC and PS Op Holdings LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   6.3                
Redemptions (cost)     0.2   4.6                
Sales (cost)     0.0   0.0                
Interest income     1.6   1.5                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (2.8)   1.0                
Fair Value 24.9   24.9   27.7                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.9   5.9   5.9                
Less: funded commitments (4.3)   (4.3)   (4.5)                
Total unfunded commitments 1.6   1.6   1.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 1.6   1.6   1.4                
Investment, Identifier [Axis]: PS Operating Company LLC and PS Op Holdings LLC, Common unit                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.7 [3]   $ 5.7 [3]   $ 8.3 [7]                
Investment, Identifier [Axis]: PS Operating Company LLC and PS Op Holdings LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1165.00% [5]   1165.00% [5]   10.73% [1] 1165.00% [5] 1165.00% [5] 1165.00% [5] 1165.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 14.9 [2],[3]   $ 14.9 [2],[3]   $ 14.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 14.9 [2],[3]   $ 14.9 [2],[3]   $ 14.9 [6],[7]                
Investment, Identifier [Axis]: PS Operating Company LLC and PS Op Holdings LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1165.00% [5]   1165.00% [5]   10.73% [1] 1165.00% [5] 1165.00% [5] 1165.00% [5] 1165.00% [5] 10.73% [1] 10.73% [1] 10.73% [1] 10.73% [1]
Total first lien senior secured loans $ 4.3 [2],[3]   $ 4.3 [2],[3]   $ 4.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.3 [2],[3]   4.3 [2],[3]   4.5 [6],[7]                
Investment, Identifier [Axis]: PSC Group LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 15.1   15.1                    
Less: funded commitments (2.4)   (2.4)                    
Total unfunded commitments 12.7   12.7                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 12.7   $ 12.7                    
Investment, Identifier [Axis]: PSC Group LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1152.00%   1152.00%     1152.00% 1152.00% 1152.00% 1152.00%        
Total first lien senior secured loans [2],[3] $ 33.6   $ 33.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 33.6   $ 33.6                    
Investment, Identifier [Axis]: PSC Group LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1129.00%   1129.00%     1129.00% 1129.00% 1129.00% 1129.00%        
Total first lien senior secured loans [2],[3] $ 0.7   $ 0.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.7   $ 0.7                    
Investment, Identifier [Axis]: PSC Group LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1117.00%   1117.00%     1117.00% 1117.00% 1117.00% 1117.00%        
Total first lien senior secured loans [2],[3] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.2   $ 0.2                    
Investment, Identifier [Axis]: PSC Group LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1130.00%   1130.00%     1130.00% 1130.00% 1130.00% 1130.00%        
Total first lien senior secured loans [2],[3] $ 2.9   $ 2.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 2.9   $ 2.9                    
Investment, Identifier [Axis]: PSC Group LLC, First lien senior secured loan 5                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1146.00%   1146.00%     1146.00% 1146.00% 1146.00% 1146.00%        
Total first lien senior secured loans [2],[3] $ 0.4   $ 0.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.4   $ 0.4                    
Investment, Identifier [Axis]: PSC Group LLC, First lien senior secured loan 6                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1105.00%   1105.00%     1105.00% 1105.00% 1105.00% 1105.00%        
Total first lien senior secured loans [2],[3] $ 7.9   $ 7.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 7.9   $ 7.9                    
Investment, Identifier [Axis]: PSC Group LLC, First lien senior secured loan 7                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1152.00%   1152.00%     1152.00% 1152.00% 1152.00% 1152.00%        
Total first lien senior secured loans [2],[3] $ 2.4   $ 2.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 2.4   2.4                    
Investment, Identifier [Axis]: PSC Group LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [17] 0.0   0.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [17] 0.0   0.0                    
Investment, Identifier [Axis]: PYE-Barker Fire & Safety, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 14.9   14.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 14.9   14.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 14.9   14.9                    
Investment, Identifier [Axis]: Partnership Capital Growth Investors III, L.P., Limited partnership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.8 [3],[4],[10]   4.8 [3],[4],[10]   3.9 [7],[8],[11]                
Investment, Identifier [Axis]: Pathstone Family Office LLC and Kelso XI Tailwind Co-Investment, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.6   1.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.6   1.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 1.6   1.6                    
Investment, Identifier [Axis]: Pathstone Family Office LLC and Kelso XI Tailwind Co-Investment, L.P. 1                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.4   0.4                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.4   0.4                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.4   $ 0.4                    
Investment, Identifier [Axis]: Pathstone Family Office LLC and Kelso XI Tailwind Co-Investment, L.P., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1217.00%   1217.00%     1217.00% 1217.00% 1217.00% 1217.00%        
Total first lien senior secured loans [2],[3],[4] $ 3.9   $ 3.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] $ 3.9   $ 3.9                    
Investment, Identifier [Axis]: Pathstone Family Office LLC and Kelso XI Tailwind Co-Investment, L.P., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1218.00%   1218.00%     1218.00% 1218.00% 1218.00% 1218.00%        
Total first lien senior secured loans [2],[3],[4] $ 8.1   $ 8.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 8.0   8.0                    
Investment, Identifier [Axis]: Pathstone Family Office LLC and Kelso XI Tailwind Co-Investment, L.P., Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [4] 1.6   1.6                    
Investment, Identifier [Axis]: Pathway Vet Alliance LLC and Jedi Group Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.9   1.9   1.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 1.9   1.9   1.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 1.9   1.9   1.9                
Investment, Identifier [Axis]: Pathway Vet Alliance LLC and Jedi Group Holdings LLC, Class R common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.0 [3]   $ 3.0 [3]   $ 5.5 [7]                
Investment, Identifier [Axis]: Pathway Vet Alliance LLC and Jedi Group Holdings LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1318.00% [5]   1318.00% [5]   12.13% [1] 1318.00% [5] 1318.00% [5] 1318.00% [5] 1318.00% [5] 12.13% [1] 12.13% [1] 12.13% [1] 12.13% [1]
Total first lien senior secured loans $ 76.3 [2],[3]   $ 76.3 [2],[3]   $ 76.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 67.9 [2],[3]   67.9 [2],[3]   65.6 [6],[7]                
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.2   2.2   2.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.2   2.2   2.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.2   $ 2.2   $ 2.2                
Investment, Identifier [Axis]: Patriot Growth Insurance Services, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1128.00% [5]   1128.00% [5]   8.87% [1] 1128.00% [5] 1128.00% [5] 1128.00% [5] 1128.00% [5] 8.87% [1] 8.87% [1] 8.87% [1] 8.87% [1]
Total first lien senior secured loans $ 15.9 [2],[3]   $ 15.9 [2],[3]   $ 16.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 15.4 [2],[3]   15.4 [2],[3]   15.5 [6],[7]                
Investment, Identifier [Axis]: PayNearMe, Inc., Warrant to purchase shares of Series E preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         0.0                
Investment, Identifier [Axis]: Paya, Inc and GTCR-Ultra Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         4.5                
Less: funded commitments         0.0                
Total unfunded commitments         4.5                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         4.5                
Investment, Identifier [Axis]: Paya, Inc and GTCR-Ultra Holdings LLC, Class B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         2.6                
Investment, Identifier [Axis]: Pegasus Global Enterprise Holdings, LLC, Mekone Blocker Acquisition, Inc. and Mekone Parent, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 11.6   11.6   20.6                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 11.6   11.6   20.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 11.6   11.6   20.6                
Investment, Identifier [Axis]: Pegasus Global Enterprise Holdings, LLC, Mekone Blocker Acquisition, Inc. and Mekone Parent, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 12.1   $ 12.1   $ 14.3                
Investment, Identifier [Axis]: Pegasus Global Enterprise Holdings, LLC, Mekone Blocker Acquisition, Inc. and Mekone Parent, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1079.00% [5]   1079.00% [5]   10.48% [1] 1079.00% [5] 1079.00% [5] 1079.00% [5] 1079.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 13.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 13.7 [6],[7]                
Investment, Identifier [Axis]: Pegasus Global Enterprise Holdings, LLC, Mekone Blocker Acquisition, Inc. and Mekone Parent, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1140.00% [5]   1140.00% [5]   10.48% [1] 1140.00% [5] 1140.00% [5] 1140.00% [5] 1140.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Pegasus Global Enterprise Holdings, LLC, Mekone Blocker Acquisition, Inc. and Mekone Parent, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   9.98% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 9.98% [1] 9.98% [1] 9.98% [1] 9.98% [1]
Total first lien senior secured loans $ 0.3 [2],[3]   $ 0.3 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.3 [2],[3]   0.3 [2],[3]   0.2 [6],[7]                
Investment, Identifier [Axis]: Pelican Products, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.3   2.3   2.3                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.3   2.3   2.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.3   $ 2.3   $ 2.3                
Investment, Identifier [Axis]: Pelican Products, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1340.00% [5]   1340.00% [5]   12.20% [1] 1340.00% [5] 1340.00% [5] 1340.00% [5] 1340.00% [5] 12.20% [1] 12.20% [1] 12.20% [1] 12.20% [1]
Total first lien senior secured loans $ 60.0 [2],[3]   $ 60.0 [2],[3]   $ 60.0 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 57.0 [2],[3]   57.0 [2],[3]   55.8 [6],[7],[16]                
Investment, Identifier [Axis]: People Corporation                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 19.4   19.4   20.6                
Less: funded commitments 0.0   0.0   (1.3)                
Total unfunded commitments 19.4   19.4   19.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 19.4   $ 19.4   $ 19.3                
Investment, Identifier [Axis]: People Corporation, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1175.00% [5]   1175.00% [5]   10.91% [1] 1175.00% [5] 1175.00% [5] 1175.00% [5] 1175.00% [5] 10.91% [1] 10.91% [1] 10.91% [1] 10.91% [1]
Total first lien senior secured loans $ 38.6 [2],[3],[4]   $ 38.6 [2],[3],[4]   $ 40.9 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 38.6 [2],[3],[4]   $ 38.6 [2],[3],[4]   $ 40.5 [6],[7],[8]                
Investment, Identifier [Axis]: People Corporation, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1122.00% [5]   1122.00% [5]   10.91% [1] 1122.00% [5] 1122.00% [5] 1122.00% [5] 1122.00% [5] 10.91% [1] 10.91% [1] 10.91% [1] 10.91% [1]
Total first lien senior secured loans $ 22.3 [2],[3],[4]   $ 22.3 [2],[3],[4]   $ 12.8 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 22.3 [2],[3],[4]   $ 22.3 [2],[3],[4]   $ 12.6 [6],[7],[8]                
Investment, Identifier [Axis]: People Corporation, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1144.00% [5]   1144.00% [5]   10.17% [1] 1144.00% [5] 1144.00% [5] 1144.00% [5] 1144.00% [5] 10.17% [1] 10.17% [1] 10.17% [1] 10.17% [1]
Total first lien senior secured loans $ 0.5 [2],[3],[4]   $ 0.5 [2],[3],[4]   $ 8.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.5 [2],[3],[4]   $ 0.5 [2],[3],[4]   $ 7.8 [6],[7],[8]                
Investment, Identifier [Axis]: People Corporation, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1375.00% [5]   1375.00% [5]   10.99% [1] 1375.00% [5] 1375.00% [5] 1375.00% [5] 1375.00% [5] 10.99% [1] 10.99% [1] 10.99% [1] 10.99% [1]
Total first lien senior secured loans $ 3.7 [2],[4]   $ 3.7 [2],[4]   $ 1.3 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.7 [2],[4]   3.7 [2],[4]   1.3 [6],[7],[8]                
Investment, Identifier [Axis]: Perforce Software, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.5   7.5   0.5                
Less: funded commitments (1.1)   (1.1)   0.0                
Total unfunded commitments 6.4   6.4   0.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 6.4   $ 6.4   $ 0.5                
Investment, Identifier [Axis]: Perforce Software, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 982.00%   982.00%     982.00% 982.00% 982.00% 982.00%        
Total first lien senior secured loans [3],[13] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[13] $ 1.0   $ 1.0                    
Investment, Identifier [Axis]: PerkinElmer U.S. LLC and NM Polaris Co-Invest, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1216.00%   1216.00%     1216.00% 1216.00% 1216.00% 1216.00%        
Total first lien senior secured loans [2],[3] $ 17.4   $ 17.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 17.3   17.3                    
Investment, Identifier [Axis]: PerkinElmer U.S. LLC and NM Polaris Co-Invest, L.P., Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 10.5   10.5                    
Investment, Identifier [Axis]: PestCo Holdings, LLC and PestCo, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.9   0.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.9   0.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 0.9   0.9                    
Investment, Identifier [Axis]: PestCo Holdings, LLC and PestCo, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.0   $ 2.0                    
Investment, Identifier [Axis]: PestCo Holdings, LLC and PestCo, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1192.00%   1192.00%     1192.00% 1192.00% 1192.00% 1192.00%        
Total first lien senior secured loans [2],[3] $ 1.7   $ 1.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.7   $ 1.7                    
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1042.00% [5]   1042.00% [5]   9.38% [1] 1042.00% [5] 1042.00% [5] 1042.00% [5] 1042.00% [5] 9.38% [1] 9.38% [1] 9.38% [1] 9.38% [1]
Total first lien senior secured loans $ 5.3 [2],[3]   $ 5.3 [2],[3]   $ 5.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.3 [2],[3]   5.3 [2],[3]   5.0 [6],[7]                
Investment, Identifier [Axis]: Petroleum Service Group LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         17.5                
Less: funded commitments         (4.4)                
Total unfunded commitments         13.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 13.1                
Investment, Identifier [Axis]: Petroleum Service Group LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.42%         10.42% 10.42% 10.42% 10.42%
Total first lien senior secured loans [6],[7]         $ 34.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 34.5                
Investment, Identifier [Axis]: Petroleum Service Group LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.72%         10.72% 10.72% 10.72% 10.72%
Total first lien senior secured loans [6],[7]         $ 11.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 11.6                
Investment, Identifier [Axis]: Petroleum Service Group LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.71%         9.71% 9.71% 9.71% 9.71%
Total first lien senior secured loans [6],[7],[14]         $ 2.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[14]         2.5                
Investment, Identifier [Axis]: Petrus Buyer, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.7   2.7   2.7                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.7   2.7   2.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.7   $ 2.7   $ 2.7                
Investment, Identifier [Axis]: Petrus Buyer, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1159.00% [5]   1159.00% [5]   10.70% [1] 1159.00% [5] 1159.00% [5] 1159.00% [5] 1159.00% [5] 10.70% [1] 10.70% [1] 10.70% [1] 10.70% [1]
Total first lien senior secured loans $ 5.0 [2],[3]   $ 5.0 [2],[3]   $ 5.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.0 [2],[3]   5.0 [2],[3]   4.9 [6],[7]                
Investment, Identifier [Axis]: Petvisor Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 31.8   31.8   37.6                
Less: funded commitments (1.2)   (1.2)   0.0                
Total unfunded commitments 30.6   30.6   37.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 30.6   $ 30.6   $ 37.6                
Investment, Identifier [Axis]: Petvisor Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.21%         10.21% 10.21% 10.21% 10.21%
Total first lien senior secured loans [6],[7]         $ 21.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         21.5                
Investment, Identifier [Axis]: Petvisor Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1089.00%   1089.00%     1089.00% 1089.00% 1089.00% 1089.00%        
Total first lien senior secured loans [2],[3] $ 5.9   $ 5.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 5.9   5.9                    
Investment, Identifier [Axis]: Petvisor Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [2],[3] 0.1   0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.1   $ 0.1                    
Investment, Identifier [Axis]: Petvisor Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1300.00%   1300.00%     1300.00% 1300.00% 1300.00% 1300.00%        
Total first lien senior secured loans [2],[3] $ 1.2   $ 1.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.2   1.2                    
Investment, Identifier [Axis]: Ping Identity Holding Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.2   0.2   0.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.2   0.2   0.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.2   $ 0.2   $ 0.2                
Investment, Identifier [Axis]: Ping Identity Holding Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1232.00% [5]   1232.00% [5]   11.32% [1] 1232.00% [5] 1232.00% [5] 1232.00% [5] 1232.00% [5] 11.32% [1] 11.32% [1] 11.32% [1] 11.32% [1]
Total first lien senior secured loans $ 11.3 [2],[3]   $ 11.3 [2],[3]   $ 11.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.3 [2],[3]   11.3 [2],[3]   11.0 [6],[7]                
Investment, Identifier [Axis]: Piper Jaffray Merchant Banking Fund I, L.P., Limited partnership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.5 [4],[10]   0.5 [4],[10]   0.5 [8],[11]                
Investment, Identifier [Axis]: Plaskolite PPC Intermediate II LLC and Plaskolite PPC Blocker LLC, Co-Invest units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.3 [3]   $ 0.3 [3]   $ 0.5 [7]                
Investment, Identifier [Axis]: Plaskolite PPC Intermediate II LLC and Plaskolite PPC Blocker LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 963.00% [5]   963.00% [5]   8.41% [1] 963.00% [5] 963.00% [5] 963.00% [5] 963.00% [5] 8.41% [1] 8.41% [1] 8.41% [1] 8.41% [1]
Total first lien senior secured loans $ 22.4 [2],[3],[10]   $ 22.4 [2],[3],[10]   $ 22.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 21.4 [2],[3],[10]   $ 21.4 [2],[3],[10]   $ 20.1 [6],[7]                
Investment, Identifier [Axis]: Plaskolite PPC Intermediate II LLC and Plaskolite PPC Blocker LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1288.00% [5]   1288.00% [5]   11.98% [1] 1288.00% [5] 1288.00% [5] 1288.00% [5] 1288.00% [5] 11.98% [1] 11.98% [1] 11.98% [1] 11.98% [1]
Total first lien senior secured loans $ 55.0 [2],[3]   $ 55.0 [2],[3]   $ 55.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 52.2 [2],[3]   52.2 [2],[3]   48.9 [6],[7]                
Investment, Identifier [Axis]: Pluralsight, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.3   0.3   0.3                
Less: funded commitments (0.2)   (0.2)   (0.2)                
Total unfunded commitments 0.1   0.1   0.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.1   $ 0.1   $ 0.1                
Investment, Identifier [Axis]: Pluralsight, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1345.00% [5]   1345.00% [5]   11.83% [1] 1345.00% [5] 1345.00% [5] 1345.00% [5] 1345.00% [5] 11.83% [1] 11.83% [1] 11.83% [1] 11.83% [1]
Total first lien senior secured loans $ 106.2 [2],[3]   $ 106.2 [2],[3]   $ 106.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 99.8 [2],[3]   $ 99.8 [2],[3]   $ 104.0 [6],[7]                
Investment, Identifier [Axis]: Pluralsight, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1347.00% [5]   1347.00% [5]   12.36% [1] 1347.00% [5] 1347.00% [5] 1347.00% [5] 1347.00% [5] 12.36% [1] 12.36% [1] 12.36% [1] 12.36% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [2],[3]   0.2 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Polymer Solutions Group, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.92%         8.92% 8.92% 8.92% 8.92%
Total first lien senior secured loans [6],[7]         $ 0.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.0                
Investment, Identifier [Axis]: Poplicus Incorporated, Warrant to purchase shares of Series C preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: PosiGen, Inc., Warrant to purchase shares of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: PosiGen, Inc., Warrant to purchase shares of series D-1 preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: Potomac Intermediate Holdings II LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   6.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (19.3)   (42.4)                
Fair Value 123.9   123.9   143.2                
Investment, Identifier [Axis]: Potomac Intermediate Holdings II LLC, Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 123.9   123.9   143.2                
Investment, Identifier [Axis]: PracticeTek Purchaser, LLC, PracticeTek MidCo, LLC and GSV PracticeTek Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.3   12.3                    
Less: funded commitments (0.5)   (0.5)                    
Total unfunded commitments 11.8   11.8                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 11.8   11.8                    
Investment, Identifier [Axis]: PracticeTek Purchaser, LLC, PracticeTek MidCo, LLC and GSV PracticeTek Holdings, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 31.4   $ 31.4                    
Investment, Identifier [Axis]: PracticeTek Purchaser, LLC, PracticeTek MidCo, LLC and GSV PracticeTek Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 1132.00%   1132.00%     1132.00% 1132.00% 1132.00% 1132.00%        
Total first lien senior secured loans [2],[3] $ 36.5   $ 36.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 35.6   $ 35.6                    
Investment, Identifier [Axis]: PracticeTek Purchaser, LLC, PracticeTek MidCo, LLC and GSV PracticeTek Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 982.00%   982.00%     982.00% 982.00% 982.00% 982.00%        
Total first lien senior secured loans [2],[3] $ 0.5   $ 0.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.5   0.5                    
Investment, Identifier [Axis]: PracticeTek Purchaser, LLC, PracticeTek MidCo, LLC and GSV PracticeTek Holdings, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3] 39.2   39.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 38.0   38.0                    
Investment, Identifier [Axis]: Precinmac (US) Holdings Inc., Trimaster Manufacturing Inc. and Blade Group Holdings, LP., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 22.7 [3]   $ 22.7 [3]   $ 26.5 [7]                
Investment, Identifier [Axis]: Precinmac (US) Holdings Inc., Trimaster Manufacturing Inc. and Blade Group Holdings, LP., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.42% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.42% [1] 10.42% [1] 10.42% [1] 10.42% [1]
Total first lien senior secured loans $ 11.6 [2],[3],[4]   $ 11.6 [2],[3],[4]   $ 11.7 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 11.3 [2],[3],[4]   $ 11.3 [2],[3],[4]   $ 11.4 [6],[7],[8]                
Investment, Identifier [Axis]: Precinmac (US) Holdings Inc., Trimaster Manufacturing Inc. and Blade Group Holdings, LP., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.42% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.42% [1] 10.42% [1] 10.42% [1] 10.42% [1]
Total first lien senior secured loans $ 4.0 [2],[3],[4]   $ 4.0 [2],[3],[4]   $ 4.0 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.9 [2],[3],[4]   3.9 [2],[3],[4]   3.9 [6],[7],[8]                
Investment, Identifier [Axis]: Precision Concepts International LLC and Precision Concepts Canada Corporation                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 14.4   14.4   19.2                
Less: funded commitments 0.0   0.0   (6.2)                
Total unfunded commitments 14.4   14.4   13.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 14.4   $ 14.4   $ 13.0                
Investment, Identifier [Axis]: Precision Concepts International LLC and Precision Concepts Canada Corporation, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1174.00% [5]   1174.00% [5]   10.18% [1] 1174.00% [5] 1174.00% [5] 1174.00% [5] 1174.00% [5] 10.18% [1] 10.18% [1] 10.18% [1] 10.18% [1]
Total first lien senior secured loans $ 11.6 [2],[3],[4]   $ 11.6 [2],[3],[4]   $ 14.7 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 11.6 [2],[3],[4]   $ 11.6 [2],[3],[4]   $ 14.7 [6],[7],[8]                
Investment, Identifier [Axis]: Precision Concepts International LLC and Precision Concepts Canada Corporation, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1174.00% [5]   1174.00% [5]   10.43% [1] 1174.00% [5] 1174.00% [5] 1174.00% [5] 1174.00% [5] 10.43% [1] 10.43% [1] 10.43% [1] 10.43% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investment, Identifier [Axis]: Precision Concepts International LLC and Precision Concepts Canada Corporation, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1174.00% [5]   1174.00% [5]   10.18% [1] 1174.00% [5] 1174.00% [5] 1174.00% [5] 1174.00% [5] 10.18% [1] 10.18% [1] 10.18% [1] 10.18% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3],[4]   0.1 [2],[3],[4]   $ 0.1 [6],[7],[8]                
Investment, Identifier [Axis]: Precision Concepts International LLC and Precision Concepts Canada Corporation, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.18%         10.18% 10.18% 10.18% 10.18%
Total first lien senior secured loans [6],[7],[8]         $ 6.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         6.2                
Investment, Identifier [Axis]: Premier Specialties, Inc. and RMCF V CIV XLIV, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.5   3.5   11.0                
Less: funded commitments (3.5)   (3.5)   (2.3)                
Total unfunded commitments 0.0   0.0   8.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.0   $ 0.0   $ 8.7                
Investment, Identifier [Axis]: Premier Specialties, Inc. and RMCF V CIV XLIV, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.38% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 27.1 [2],[3]   $ 27.1 [2],[3]   $ 27.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 23.5 [2],[3]   $ 23.5 [2],[3]   $ 25.6 [6],[7]                
Investment, Identifier [Axis]: Premier Specialties, Inc. and RMCF V CIV XLIV, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.38% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 3.5 [2],[3]   $ 3.5 [2],[3]   $ 2.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.0 [2],[3]   3.0 [2],[3]   2.2 [6],[7]                
Investment, Identifier [Axis]: Premier Specialties, Inc. and RMCF V CIV XLIV, L.P., Limited partner interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.4 [3]   1.4 [3]   2.8 [7]                
Investment, Identifier [Axis]: Premise Health Holding Corp. and OMERS Bluejay Investment Holdings LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 36.0   36.0   36.0                
Less: funded commitments (0.6)   (0.6)   (0.6)                
Total unfunded commitments 35.4   35.4   35.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 35.4   35.4   35.4                
Investment, Identifier [Axis]: Premise Health Holding Corp. and OMERS Bluejay Investment Holdings LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 12.7 [3]   $ 12.7 [3]   $ 12.8 [7]                
Investment, Identifier [Axis]: Premise Health Holding Corp. and OMERS Bluejay Investment Holdings LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 934.00% [5]   934.00% [5]   7.92% [1] 934.00% [5] 934.00% [5] 934.00% [5] 934.00% [5] 7.92% [1] 7.92% [1] 7.92% [1] 7.92% [1]
Total first lien senior secured loans $ 8.5 [2],[3]   $ 8.5 [2],[3]   $ 8.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 8.2 [2],[3]   8.2 [2],[3]   8.1 [6],[7]                
Investment, Identifier [Axis]: Premise Health Holding Corp. and OMERS Bluejay Investment Holdings LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [17]   0.0 [17]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [17]   $ 0.0 [17]   $ 0.0 [15]                
Investment, Identifier [Axis]: Premise Health Holding Corp. and OMERS Bluejay Investment Holdings LP, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1309.00% [5]   1309.00% [5]   11.67% [1] 1309.00% [5] 1309.00% [5] 1309.00% [5] 1309.00% [5] 11.67% [1] 11.67% [1] 11.67% [1] 11.67% [1]
Total first lien senior secured loans $ 67.1 [3]   $ 67.1 [3]   $ 67.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 65.1 [3]   65.1 [3]   64.4 [7]                
Investment, Identifier [Axis]: Prime Buyer, L.L.C.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 15.9   15.9   15.9                
Less: funded commitments (0.8)   (0.8)   (2.7)                
Total unfunded commitments 15.1   15.1   13.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 15.1   $ 15.1   $ 13.2                
Investment, Identifier [Axis]: Prime Buyer, L.L.C., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1068.00% [5]   1068.00% [5]   9.88% [1] 1068.00% [5] 1068.00% [5] 1068.00% [5] 1068.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 2.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.7 [2],[3]   $ 0.7 [2],[3]   2.6 [6],[7]                
Investment, Identifier [Axis]: Primrose Holding Corporation                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)         0.0                
Redemptions (cost)         0.0                
Sales (cost)         4.6                
Interest income         0.0                
Capital structuring service fees         0.0                
Dividend income         0.0                
Other income         0.0                
Net realized gains (losses):         28.9                
Net unrealized gains (losses):         (22.4)                
Fair Value         $ 0.0                
Investment, Identifier [Axis]: Priority Holdings, LLC and Priority Technology Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1143.00% [5]   1143.00% [5]   10.48% [1] 1143.00% [5] 1143.00% [5] 1143.00% [5] 1143.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.7 [2],[3],[4]   $ 0.7 [2],[3],[4]   $ 0.7 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.7 [2],[3],[4]   $ 0.7 [2],[3],[4]   $ 0.7 [6],[7],[8]                
Investment, Identifier [Axis]: Priority Holdings, LLC and Priority Technology Holdings, Inc., Senior preferred stock                          
Schedule of Investments [Line Items]                          
Coupon | Rate 17.47% [5]   17.47% [5]   16.73% [1] 17.47% [5] 17.47% [5] 17.47% [5] 17.47% [5] 16.73% [1] 16.73% [1] 16.73% [1] 16.73% [1]
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 77.1 [2],[3],[4]   $ 77.1 [2],[3],[4]   $ 73.2 [7],[8]                
Investment, Identifier [Axis]: Priority Holdings, LLC and Priority Technology Holdings, Inc., Warrant to purchase shares of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.7 [3],[4],[10]   1.7 [3],[4],[10]   2.8 [7],[8],[11]                
Investment, Identifier [Axis]: Priority Waste Holdings LLC, Priority Waste Holdings Indiana LLC and Priority Waste Super Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.6   12.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 12.6   12.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 12.6   $ 12.6                    
Investment, Identifier [Axis]: Priority Waste Holdings LLC, Priority Waste Holdings Indiana LLC and Priority Waste Super Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 13.39%   13.39%     13.39% 13.39% 13.39% 13.39%        
Total first lien senior secured loans [2],[3] $ 20.9   $ 20.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 20.5   20.5                    
Investment, Identifier [Axis]: Priority Waste Holdings LLC, Priority Waste Holdings Indiana LLC and Priority Waste Super Holdings, LLC, Warrant to purchase units of Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.6   0.6                    
Investment, Identifier [Axis]: Pritchard Industries, LLC and LJ Pritchard TopCo Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         3.3                
Less: funded commitments         0.0                
Total unfunded commitments         3.3                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         3.3                
Investment, Identifier [Axis]: Pritchard Industries, LLC and LJ Pritchard TopCo Holdings, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.7 [3]   $ 5.7 [3]   $ 8.4 [7]                
Investment, Identifier [Axis]: Pritchard Industries, LLC and LJ Pritchard TopCo Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1109.00% [5]   1109.00% [5]   10.47% [1] 1109.00% [5] 1109.00% [5] 1109.00% [5] 1109.00% [5] 10.47% [1] 10.47% [1] 10.47% [1] 10.47% [1]
Total first lien senior secured loans $ 67.9 [2],[3]   $ 67.9 [2],[3]   $ 65.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 65.8 [2],[3]   65.8 [2],[3]   63.1 [6],[7]                
Investment, Identifier [Axis]: Production Resource Group, L.L.C. and PRG III, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   2.5                
Redemptions (cost)     1.1   0.3                
Sales (cost)     0.0   0.0                
Interest income     8.0   7.0                
Capital structuring service fees     0.0   0.1                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     11.7   33.6                
Fair Value 111.8   111.8   97.3                
Investment, Identifier [Axis]: Production Resource Group, L.L.C. and PRG III, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 46.1 [3]   $ 46.1 [3]   $ 34.3 [7]                
Investment, Identifier [Axis]: Production Resource Group, L.L.C. and PRG III, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon 13.92% [5]   13.92% [5]   12.85% [1] 13.92% [5] 13.92% [5] 13.92% [5] 13.92% [5] 12.85% [1] 12.85% [1] 12.85% [1] 12.85% [1]
Total first lien senior secured loans $ 42.2 [2],[3]   $ 42.2 [2],[3]   $ 39.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 42.2 [2],[3]   $ 42.2 [2],[3]   $ 39.1 [6],[7]                
Investment, Identifier [Axis]: Production Resource Group, L.L.C. and PRG III, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon 12.82% [5]   12.82% [5]   11.85% [1] 12.82% [5] 12.82% [5] 12.82% [5] 12.82% [5] 11.85% [1] 11.85% [1] 11.85% [1] 11.85% [1]
Total first lien senior secured loans $ 15.2 [2],[3]   $ 15.2 [2],[3]   $ 15.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 15.2 [2],[3]   $ 15.2 [2],[3]   $ 15.4 [6],[7]                
Investment, Identifier [Axis]: Production Resource Group, L.L.C. and PRG III, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon 12.92% [5]   12.92% [5]   11.88% [1] 12.92% [5] 12.92% [5] 12.92% [5] 12.92% [5] 11.88% [1] 11.88% [1] 11.88% [1] 11.88% [1]
Total first lien senior secured loans $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 7.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 7.6 [6],[7]                
Investment, Identifier [Axis]: Production Resource Group, L.L.C. and PRG III, LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon 12.92% [5]   12.92% [5]   11.88% [1] 12.92% [5] 12.92% [5] 12.92% [5] 12.92% [5] 11.88% [1] 11.88% [1] 11.88% [1] 11.88% [1]
Total first lien senior secured loans $ 7.5 [2],[3]   $ 7.5 [2],[3]   $ 0.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 7.5 [2],[3]   7.5 [2],[3]   0.9 [6],[7]                
Investment, Identifier [Axis]: Professional Fighters League, LLC and PFL MMA, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.1                
Less: funded commitments         0.0                
Total unfunded commitments         0.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         0.1                
Investment, Identifier [Axis]: Professional Fighters League, LLC and PFL MMA, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 18.7 [3]   18.7 [3]   17.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 18.7 [3]   18.7 [3]   $ 17.1 [7]                
Investment, Identifier [Axis]: Professional Fighters League, LLC and PFL MMA, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         14.00%         14.00% 14.00% 14.00% 14.00%
Total first lien senior secured loans 0.2 [3]   0.2 [3]   $ 0.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [3]   0.2 [3]   0.1 [7]                
Investment, Identifier [Axis]: Professional Fighters League, LLC and PFL MMA, Inc., Series E preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.7 [3]   0.7 [3]   0.6 [7]                
Investment, Identifier [Axis]: Professional Fighters League, LLC and PFL MMA, Inc., Warrant to purchase shares of common stock 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.3 [3]   1.3 [3]   0.8 [7]                
Investment, Identifier [Axis]: Professional Fighters League, LLC and PFL MMA, Inc., Warrant to purchase shares of common stock 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [3]   0.2 [3]   0.2 [7]                
Investment, Identifier [Axis]: ProfitSolv Purchaser, Inc. and PS Co-Invest, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.1   0.1   13.3                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.1   0.1   13.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.1   $ 0.1   $ 13.3                
Investment, Identifier [Axis]: ProfitSolv Purchaser, Inc. and PS Co-Invest, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   10.23% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 9.8 [2],[3]   $ 9.8 [2],[3]   $ 5.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 9.7 [2],[3]   9.7 [2],[3]   5.4 [6],[7]                
Investment, Identifier [Axis]: ProfitSolv Purchaser, Inc. and PS Co-Invest, L.P., Limited partnership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.6 [3]   1.6 [3]   1.5 [7]                
Investment, Identifier [Axis]: Project Alpha Intermediate Holding, Inc. and Qlik Parent, Inc., Class A common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 21.4 [3]   21.4 [3]   14.4 [7]                
Investment, Identifier [Axis]: Project Alpha Intermediate Holding, Inc. and Qlik Parent, Inc., Class B common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [3]   0.2 [3]   $ 0.1 [7]                
Investment, Identifier [Axis]: Project Alpha Intermediate Holding, Inc. and Qlik Parent, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.39%         8.39% 8.39% 8.39% 8.39%
Total first lien senior secured loans [7],[11]         $ 2.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[11]         2.8                
Investment, Identifier [Axis]: Project Essential Bidco, Inc. and Project Essential Super Parent, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.1   1.1   1.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 1.1   1.1   1.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.1   $ 1.1   $ 1.1                
Investment, Identifier [Axis]: Project Essential Bidco, Inc. and Project Essential Super Parent, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 11.78% [5]   11.78% [5]   9.99% [1] 11.78% [5] 11.78% [5] 11.78% [5] 11.78% [5] 9.99% [1] 9.99% [1] 9.99% [1] 9.99% [1]
Total first lien senior secured loans $ 36.3 [2],[3]   $ 36.3 [2],[3]   $ 36.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 34.9 [2],[3]   34.9 [2],[3]   34.7 [6],[7]                
Investment, Identifier [Axis]: Project Essential Bidco, Inc. and Project Essential Super Parent, Inc., Preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 33.8 [2],[3]   33.8 [2],[3]   30.2 [7]                
Investment, Identifier [Axis]: Project Potter Buyer, LLC and Project Potter Parent, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.5   5.5   5.5                
Less: funded commitments (2.1)   (2.1)   (2.1)                
Total unfunded commitments 3.4   3.4   3.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 3.4   3.4   3.4                
Investment, Identifier [Axis]: Project Potter Buyer, LLC and Project Potter Parent, L.P., Class B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.1 [3]   $ 5.1 [3]   $ 9.3 [7]                
Investment, Identifier [Axis]: Project Potter Buyer, LLC and Project Potter Parent, L.P., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1207.00% [5]   1207.00% [5]   12.07% [1] 1207.00% [5] 1207.00% [5] 1207.00% [5] 1207.00% [5] 12.07% [1] 12.07% [1] 12.07% [1] 12.07% [1]
Total first lien senior secured loans $ 43.3 [2],[3]   $ 43.3 [2],[3]   $ 43.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 43.3 [2],[3]   $ 43.3 [2],[3]   $ 43.6 [6],[7]                
Investment, Identifier [Axis]: Project Potter Buyer, LLC and Project Potter Parent, L.P., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1207.00% [5]   1207.00% [5]   12.07% [1] 1207.00% [5] 1207.00% [5] 1207.00% [5] 1207.00% [5] 12.07% [1] 12.07% [1] 12.07% [1] 12.07% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 14.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 14.3 [6],[7]                
Investment, Identifier [Axis]: Project Potter Buyer, LLC and Project Potter Parent, L.P., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1207.00% [5]   1207.00% [5]   12.07% [1] 1207.00% [5] 1207.00% [5] 1207.00% [5] 1207.00% [5] 12.07% [1] 12.07% [1] 12.07% [1] 12.07% [1]
Total first lien senior secured loans $ 11.9 [2],[3]   $ 11.9 [2],[3]   $ 12.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 11.9 [2],[3]   $ 11.9 [2],[3]   $ 12.8 [6],[7]                
Investment, Identifier [Axis]: Project Potter Buyer, LLC and Project Potter Parent, L.P., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.07%         12.07% 12.07% 12.07% 12.07%
Total first lien senior secured loans [6],[7]         $ 4.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 4.9                
Investment, Identifier [Axis]: Project Potter Buyer, LLC and Project Potter Parent, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1207.00% [5]   1207.00% [5]   12.07% [1] 1207.00% [5] 1207.00% [5] 1207.00% [5] 1207.00% [5] 12.07% [1] 12.07% [1] 12.07% [1] 12.07% [1]
Total first lien senior secured loans $ 2.1 [2],[3],[13]   $ 2.1 [2],[3],[13]   $ 2.1 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.1 [2],[3],[13]   $ 2.1 [2],[3],[13]   $ 2.1 [6],[7],[14]                
Investment, Identifier [Axis]: Project Ruby Ultimate Parent Corp., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1193.00% [5]   1193.00% [5]   10.88% [1] 1193.00% [5] 1193.00% [5] 1193.00% [5] 1193.00% [5] 10.88% [1] 10.88% [1] 10.88% [1] 10.88% [1]
Total first lien senior secured loans $ 193.1 [2],[3]   $ 193.1 [2],[3]   $ 193.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 189.2 [2],[3]   189.2 [2],[3]   181.5 [6],[7]                
Investment, Identifier [Axis]: Proofpoint, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.1   3.1   3.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.1   3.1   3.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.1   $ 3.1   $ 3.1                
Investment, Identifier [Axis]: Proofpoint, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 868.00% [5]   868.00% [5]   7.98% [1] 868.00% [5] 868.00% [5] 868.00% [5] 868.00% [5] 7.98% [1] 7.98% [1] 7.98% [1] 7.98% [1]
Total first lien senior secured loans $ 1.0 [2],[3],[10]   $ 1.0 [2],[3],[10]   $ 1.0 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.0 [2],[3],[10]   $ 1.0 [2],[3],[10]   $ 0.9 [6],[7],[11]                
Investment, Identifier [Axis]: Proofpoint, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1168.00% [5]   1168.00% [5]   10.98% [1] 1168.00% [5] 1168.00% [5] 1168.00% [5] 1168.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 34.6 [2],[3]   $ 34.6 [2],[3]   $ 34.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 34.6 [2],[3]   34.6 [2],[3]   34.6 [6],[7]                
Investment, Identifier [Axis]: Pueblo Mechanical and Controls, LLC and OMERS PMC Investment Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         3.6                
Less: funded commitments         0.0                
Total unfunded commitments         3.6                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         3.6                
Investment, Identifier [Axis]: Pueblo Mechanical and Controls, LLC and OMERS PMC Investment Holdings LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[16]         $ 11.0                
Investment, Identifier [Axis]: Pueblo Mechanical and Controls, LLC and OMERS PMC Investment Holdings LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.47%         10.47% 10.47% 10.47% 10.47%
Total first lien senior secured loans [6],[7],[16]         $ 1.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         1.4                
Investment, Identifier [Axis]: PushPay USA Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.6   3.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 3.6   3.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.6   $ 3.6                    
Investment, Identifier [Axis]: PushPay USA Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1227.00%   1227.00%     1227.00% 1227.00% 1227.00% 1227.00%        
Total first lien senior secured loans [2],[3] $ 12.7   $ 12.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 12.4   12.4                    
Investment, Identifier [Axis]: Pyramid Management Advisors, LLC and Pyramid Investors, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         9.8                
Less: funded commitments         (9.8)                
Total unfunded commitments         0.0                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.0                
Investment, Identifier [Axis]: Pyramid Management Advisors, LLC and Pyramid Investors, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon [1]         11.63%         11.63% 11.63% 11.63% 11.63%
Total first lien senior secured loans [6],[7],[16]         $ 16.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         $ 16.9                
Investment, Identifier [Axis]: Pyramid Management Advisors, LLC and Pyramid Investors, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon [1]         11.63%         11.63% 11.63% 11.63% 11.63%
Total first lien senior secured loans [6],[7],[16]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         $ 0.1                
Investment, Identifier [Axis]: Pyramid Management Advisors, LLC and Pyramid Investors, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         11.60%         11.60% 11.60% 11.60% 11.60%
Total first lien senior secured loans [6],[7],[14],[16]         $ 9.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[14],[16]         9.7                
Investment, Identifier [Axis]: Pyramid Management Advisors, LLC and Pyramid Investors, LLC, Preferred membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [16]         0.9                
Investment, Identifier [Axis]: Pyramid-BMC IntermediateCo I, LLC and Pyramid Investors, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.6   1.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.6   1.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.6   $ 1.6                    
Investment, Identifier [Axis]: Pyramid-BMC IntermediateCo I, LLC and Pyramid Investors, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1333.00%   1333.00%     1333.00% 1333.00% 1333.00% 1333.00%        
Total first lien senior secured loans [2],[3] $ 7.7   $ 7.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 7.7   7.7                    
Investment, Identifier [Axis]: Pyramid-BMC IntermediateCo I, LLC and Pyramid Investors, LLC, Preferred membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.0   1.0                    
Investment, Identifier [Axis]: QF Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.1   1.1   2.3                
Less: funded commitments (0.4)   (0.4)   0.0                
Total unfunded commitments 0.7   0.7   2.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.7   $ 0.7   $ 2.3                
Investment, Identifier [Axis]: QF Holdings, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1172.00% [5]   1172.00% [5]   11.02% [1] 1172.00% [5] 1172.00% [5] 1172.00% [5] 1172.00% [5] 11.02% [1] 11.02% [1] 11.02% [1] 11.02% [1]
Total first lien senior secured loans $ 6.8 [2],[3]   $ 6.8 [2],[3]   $ 8.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.8 [2],[3]   $ 6.8 [2],[3]   $ 8.1 [6],[7]                
Investment, Identifier [Axis]: QF Holdings, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1172.00% [5]   1172.00% [5]   10.43% [1] 1172.00% [5] 1172.00% [5] 1172.00% [5] 1172.00% [5] 10.43% [1] 10.43% [1] 10.43% [1] 10.43% [1]
Total first lien senior secured loans $ 4.9 [2],[3]   $ 4.9 [2],[3]   $ 6.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.9 [2],[3]   $ 4.9 [2],[3]   $ 6.8 [6],[7]                
Investment, Identifier [Axis]: QF Holdings, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1172.00% [5]   1172.00% [5]   10.64% [1] 1172.00% [5] 1172.00% [5] 1172.00% [5] 1172.00% [5] 10.64% [1] 10.64% [1] 10.64% [1] 10.64% [1]
Total first lien senior secured loans $ 8.1 [2],[3]   $ 8.1 [2],[3]   $ 3.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.1 [2],[3]   $ 8.1 [2],[3]   3.7 [6],[7]                
Investment, Identifier [Axis]: QF Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1172.00%   1172.00%     1172.00% 1172.00% 1172.00% 1172.00%        
Total first lien senior secured loans [2],[3] $ 0.4   $ 0.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.4   0.4                    
Investment, Identifier [Axis]: Qnnect, LLC and Connector TopCo, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.7   2.7   2.8                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.7   2.7   2.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.7   $ 2.7   $ 2.8                
Investment, Identifier [Axis]: Qnnect, LLC and Connector TopCo, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1208.00% [5]   1208.00% [5]   11.11% [1] 1208.00% [5] 1208.00% [5] 1208.00% [5] 1208.00% [5] 11.11% [1] 11.11% [1] 11.11% [1] 11.11% [1]
Total first lien senior secured loans $ 10.7 [2],[3]   $ 10.7 [2],[3]   $ 10.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 10.7 [2],[3]   10.7 [2],[3]   10.3 [6],[7]                
Investment, Identifier [Axis]: Qnnect, LLC and Connector TopCo, LP, Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.1 [3]   11.1 [3]   9.9 [7]                
Investment, Identifier [Axis]: R2 Acquisition Corp., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [3]   0.2 [3]   0.1 [7]                
Investment, Identifier [Axis]: RB Holdings InterCo, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.6   5.6   5.6                
Less: funded commitments (1.8)   (1.8)   (1.8)                
Total unfunded commitments 3.8   3.8   3.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.8   $ 3.8   $ 3.8                
Investment, Identifier [Axis]: RB Holdings InterCo, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1052.00% [5]   1052.00% [5]   9.32% [1] 1052.00% [5] 1052.00% [5] 1052.00% [5] 1052.00% [5] 9.32% [1] 9.32% [1] 9.32% [1] 9.32% [1]
Total first lien senior secured loans $ 11.4 [2],[3]   $ 11.4 [2],[3]   $ 11.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 11.4 [2],[3]   $ 11.4 [2],[3]   $ 11.2 [6],[7]                
Investment, Identifier [Axis]: RB Holdings InterCo, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1051.00% [5]   1051.00% [5]   9.28% [1] 1051.00% [5] 1051.00% [5] 1051.00% [5] 1051.00% [5] 9.28% [1] 9.28% [1] 9.28% [1] 9.28% [1]
Total first lien senior secured loans $ 1.8 [2],[3]   $ 1.8 [2],[3]   $ 1.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.8 [2],[3]   1.8 [2],[3]   1.7 [6],[7]                
Investment, Identifier [Axis]: RC V Tecmo Investor LLC, Common member units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 19.2 [3]   19.2 [3]   22.9 [7]                
Investment, Identifier [Axis]: RD Holdco Inc.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.9   0.0                
Redemptions (cost)     0.0   0.1                
Sales (cost)     0.0   0.0                
Interest income     0.1   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   (10.6)                
Fair Value 12.5   12.5   10.3                
Investment, Identifier [Axis]: RD Holdco Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: RD Holdco Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7],[9]         24.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[9]         10.2                
Investment, Identifier [Axis]: RD Holdco Inc., Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3],[12] 27.0   27.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[12] 12.1   12.1                    
Investment, Identifier [Axis]: RD Holdco Inc., Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [2],[3] 1.0   1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.4   0.4                    
Investment, Identifier [Axis]: RD Holdco Inc., Warrant to purchase shares of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: RE Community Holdings GP, LLC and RE Community Holdings, LP, Limited partnership interest 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: RE Community Holdings GP, LLC and RE Community Holdings, LP, Limited partnership interest 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: RF HP SCF Investor, LLC, Membership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 28.6 [3],[4]   28.6 [3],[4]   25.9 [7],[8]                
Investment, Identifier [Axis]: RMS HoldCo II, LLC & RMS Group Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.9   2.9   2.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.9   2.9   2.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.9   2.9   2.9                
Investment, Identifier [Axis]: RMS HoldCo II, LLC & RMS Group Holdings, Inc., Class A common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.1 [3]   $ 5.1 [3]   $ 5.5 [7]                
Investment, Identifier [Axis]: RMS HoldCo II, LLC & RMS Group Holdings, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.2 [6],[7]                
Investment, Identifier [Axis]: RMS HoldCo II, LLC & RMS Group Holdings, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.48% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [2],[3]   0.2 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: RSC Acquisition, Inc. and RSC Insurance Brokerage, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.6                
Less: funded commitments         0.0                
Total unfunded commitments         0.6                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.6                
Investment, Identifier [Axis]: RSC Acquisition, Inc. and RSC Insurance Brokerage, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.79%         9.79% 9.79% 9.79% 9.79%
Total first lien senior secured loans [6],[7]         $ 32.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         31.8                
Investment, Identifier [Axis]: RTI Surgical, Inc. and Pioneer Surgical Technology, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 15.9   15.9   15.9                
Less: funded commitments (12.4)   (12.4)   (9.8)                
Total unfunded commitments 3.5   3.5   6.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.5   $ 3.5   $ 6.1                
Investment, Identifier [Axis]: RTI Surgical, Inc. and Pioneer Surgical Technology, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1240.00% [5]   1240.00% [5]   10.02% [1] 1240.00% [5] 1240.00% [5] 1240.00% [5] 1240.00% [5] 10.02% [1] 10.02% [1] 10.02% [1] 10.02% [1]
Total first lien senior secured loans $ 22.3 [2],[3]   $ 22.3 [2],[3]   $ 22.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 22.3 [2],[3]   $ 22.3 [2],[3]   $ 22.3 [6],[7]                
Investment, Identifier [Axis]: RTI Surgical, Inc. and Pioneer Surgical Technology, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1217.00% [5]   1217.00% [5]   11.09% [1] 1217.00% [5] 1217.00% [5] 1217.00% [5] 1217.00% [5] 11.09% [1] 11.09% [1] 11.09% [1] 11.09% [1]
Total first lien senior secured loans $ 12.4 [2],[3]   $ 12.4 [2],[3]   $ 9.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 12.4 [2],[3]   $ 12.4 [2],[3]   9.7 [6],[7]                
Investment, Identifier [Axis]: Radiant Intermediate Holding, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1127.00%   1127.00%     1127.00% 1127.00% 1127.00% 1127.00%        
Total first lien senior secured loans [2],[3] $ 2.1   $ 2.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 2.0   2.0                    
Investment, Identifier [Axis]: Radius Aerospace, Inc. and Radius Aerospace Europe Limited                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.8   2.8   2.8                
Less: funded commitments (1.4)   (1.4)   (0.7)                
Total unfunded commitments 1.4   1.4   2.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.4   $ 1.4   $ 2.1                
Investment, Identifier [Axis]: Radius Aerospace, Inc. and Radius Aerospace Europe Limited, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   8.68% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 8.68% [1] 8.68% [1] 8.68% [1] 8.68% [1]
Total first lien senior secured loans $ 0.5 [2],[3],[4]   $ 0.5 [2],[3],[4]   $ 0.4 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.5 [2],[3],[4]   $ 0.5 [2],[3],[4]   $ 0.4 [6],[7],[8]                
Investment, Identifier [Axis]: Radius Aerospace, Inc. and Radius Aerospace Europe Limited, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1094.00% [5]   1094.00% [5]   10.08% [1] 1094.00% [5] 1094.00% [5] 1094.00% [5] 1094.00% [5] 10.08% [1] 10.08% [1] 10.08% [1] 10.08% [1]
Total first lien senior secured loans $ 0.8 [2],[3],[4]   $ 0.8 [2],[3],[4]   $ 0.4 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.8 [2],[3],[4]   0.8 [2],[3],[4]   0.4 [6],[7],[8]                
Investment, Identifier [Axis]: Radwell Parent, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.4   4.4   4.4                
Less: funded commitments (0.9)   (0.9)   0.0                
Total unfunded commitments 3.5   3.5   4.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.5   $ 3.5   $ 4.4                
Investment, Identifier [Axis]: Radwell Parent, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1214.00% [5]   1214.00% [5]   11.33% [1] 1214.00% [5] 1214.00% [5] 1214.00% [5] 1214.00% [5] 11.33% [1] 11.33% [1] 11.33% [1] 11.33% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 19.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   18.9 [6],[7]                
Investment, Identifier [Axis]: Radwell Parent, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1214.00%   1214.00%     1214.00% 1214.00% 1214.00% 1214.00%        
Total first lien senior secured loans [2],[3] $ 0.9   $ 0.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.9   0.9                    
Investment, Identifier [Axis]: Raptor Technologies, LLC, Sycamore Bidco LTD and Rocket Parent, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.4   4.4   4.4                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.4   4.4   4.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 4.4   4.4   4.4                
Investment, Identifier [Axis]: Raptor Technologies, LLC, Sycamore Bidco LTD and Rocket Parent, LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.9   $ 6.9   $ 5.9                
Investment, Identifier [Axis]: Raptor Technologies, LLC, Sycamore Bidco LTD and Rocket Parent, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.23%         10.23% 10.23% 10.23% 10.23%
Total first lien senior secured loans [6],[7],[8]         $ 8.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[8]         $ 8.2                
Investment, Identifier [Axis]: Raptor Technologies, LLC, Sycamore Bidco LTD and Rocket Parent, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1152.00%   1152.00%     1152.00% 1152.00% 1152.00% 1152.00%        
Total first lien senior secured loans [2],[3] $ 8.5   $ 8.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 8.5   $ 8.5                    
Investment, Identifier [Axis]: Raptor Technologies, LLC, Sycamore Bidco LTD and Rocket Parent, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1152.00%   1152.00%     1152.00% 1152.00% 1152.00% 1152.00%        
Total first lien senior secured loans [2],[3] $ 11.7   $ 11.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 11.7   $ 11.7                    
Investment, Identifier [Axis]: Rawlings Sporting Goods Company, Inc. and Easton Diamond Sports, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   11.48% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 11.48% [1] 11.48% [1] 11.48% [1] 11.48% [1]
Total first lien senior secured loans $ 49.3 [2],[3]   $ 49.3 [2],[3]   $ 49.7 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 49.3 [2],[3]   $ 49.3 [2],[3]   $ 49.7 [6],[7],[16]                
Investment, Identifier [Axis]: Rawlings Sporting Goods Company, Inc. and Easton Diamond Sports, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   11.48% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 11.48% [1] 11.48% [1] 11.48% [1] 11.48% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7],[16]                
Investment, Identifier [Axis]: RealPage, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1193.00% [5]   1193.00% [5]   10.88% [1] 1193.00% [5] 1193.00% [5] 1193.00% [5] 1193.00% [5] 10.88% [1] 10.88% [1] 10.88% [1] 10.88% [1]
Total first lien senior secured loans $ 84.1 [2],[3]   $ 84.1 [2],[3]   $ 84.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 84.1 [2],[3]   84.1 [2],[3]   82.4 [6],[7]                
Investment, Identifier [Axis]: Reddy Ice LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.2   0.2   0.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.2   0.2   0.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.2   $ 0.2   $ 0.2                
Investment, Identifier [Axis]: Reddy Ice LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.24% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.24% [1] 10.24% [1] 10.24% [1] 10.24% [1]
Total first lien senior secured loans $ 60.8 [2],[3]   $ 60.8 [2],[3]   $ 61.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 60.8 [2],[3]   $ 60.8 [2],[3]   $ 60.0 [6],[7]                
Investment, Identifier [Axis]: Reddy Ice LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.24% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.24% [1] 10.24% [1] 10.24% [1] 10.24% [1]
Total first lien senior secured loans $ 4.2 [2],[3]   $ 4.2 [2],[3]   $ 4.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.2 [2],[3]   $ 4.2 [2],[3]   $ 4.2 [6],[7]                
Investment, Identifier [Axis]: Reddy Ice LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1142.00% [5]   1142.00% [5]   10.24% [1] 1142.00% [5] 1142.00% [5] 1142.00% [5] 1142.00% [5] 10.24% [1] 10.24% [1] 10.24% [1] 10.24% [1]
Total first lien senior secured loans $ 0.9 [2],[3]   $ 0.9 [2],[3]   $ 0.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.9 [2],[3]   0.9 [2],[3]   0.9 [6],[7]                
Investment, Identifier [Axis]: Redwood Services, LLC and Redwood Services Holdco, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.3   12.3   4.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 12.3   12.3   4.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 12.3   $ 12.3   $ 4.5                
Investment, Identifier [Axis]: Redwood Services, LLC and Redwood Services Holdco, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1192.00% [5]   1192.00% [5]   11.17% [1] 1192.00% [5] 1192.00% [5] 1192.00% [5] 1192.00% [5] 11.17% [1] 11.17% [1] 11.17% [1] 11.17% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.8 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.8 [6],[7],[16]                
Investment, Identifier [Axis]: Redwood Services, LLC and Redwood Services Holdco, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1192.00% [5]   1192.00% [5]   11.17% [1] 1192.00% [5] 1192.00% [5] 1192.00% [5] 1192.00% [5] 11.17% [1] 11.17% [1] 11.17% [1] 11.17% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7],[16]                
Investment, Identifier [Axis]: Redwood Services, LLC and Redwood Services Holdco, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1192.00% [5]   1192.00% [5]   11.17% [1] 1192.00% [5] 1192.00% [5] 1192.00% [5] 1192.00% [5] 11.17% [1] 11.17% [1] 11.17% [1] 11.17% [1]
Total first lien senior secured loans $ 1.6 [2],[3]   $ 1.6 [2],[3]   $ 0.2 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.6 [2],[3]   1.6 [2],[3]   0.2 [6],[7],[16]                
Investment, Identifier [Axis]: Redwood Services, LLC and Redwood Services Holdco, LLC, Series D units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 42.6   42.6   33.9 [16]                
Investment, Identifier [Axis]: Reef Lifestyle, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 31.9   31.9   37.7                
Less: funded commitments (31.7)   (31.7)   (37.7)                
Total unfunded commitments 0.2   0.2   0.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.2   $ 0.2   $ 0.0                
Investment, Identifier [Axis]: Reef Lifestyle, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon 15.42% [5]   15.42% [5]   12.74% [1] 15.42% [5] 15.42% [5] 15.42% [5] 15.42% [5] 12.74% [1] 12.74% [1] 12.74% [1] 12.74% [1]
Total first lien senior secured loans $ 22.7 [2],[3]   $ 22.7 [2],[3]   $ 23.7 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 19.5 [2],[3]   $ 19.5 [2],[3]   $ 22.9 [6],[7],[16]                
Investment, Identifier [Axis]: Reef Lifestyle, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon 15.42% [5]   15.42% [5]   10.15% [1] 15.42% [5] 15.42% [5] 15.42% [5] 15.42% [5] 10.15% [1] 10.15% [1] 10.15% [1] 10.15% [1]
Total first lien senior secured loans $ 2.2 [2],[3]   $ 2.2 [2],[3]   $ 1.3 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.9 [2],[3]   $ 1.9 [2],[3]   $ 1.3 [6],[7],[16]                
Investment, Identifier [Axis]: Reef Lifestyle, LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon 15.39% [5]   15.39% [5]   14.50% [1] 15.39% [5] 15.39% [5] 15.39% [5] 15.39% [5] 14.50% [1] 14.50% [1] 14.50% [1] 14.50% [1]
Total first lien senior secured loans $ 27.3 [2],[3],[13]   $ 27.3 [2],[3],[13]   $ 35.5 [6],[7],[14],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 23.5 [2],[3],[13]   $ 23.5 [2],[3],[13]   $ 34.4 [6],[7],[14],[16]                
Investment, Identifier [Axis]: Reef Lifestyle, LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon 15.42% [5]   15.42% [5]   14.32% [1] 15.42% [5] 15.42% [5] 15.42% [5] 15.42% [5] 14.32% [1] 14.32% [1] 14.32% [1] 14.32% [1]
Total first lien senior secured loans $ 2.4 [2],[3],[13]   $ 2.4 [2],[3],[13]   $ 1.0 [6],[7],[14],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.1 [2],[3],[13]   2.1 [2],[3],[13]   1.0 [6],[7],[14],[16]                
Investment, Identifier [Axis]: Regent Education, Inc., Warrant to purchase shares of common stock 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: Regent Education, Inc., Warrant to purchase shares of common stock 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: Registrar Intermediate, LLC and PSP Registrar Co-Investment Fund, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.9   6.9   28.0                
Less: funded commitments (1.4)   (1.4)   0.0                
Total unfunded commitments 5.5   5.5   28.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.5   $ 5.5   $ 28.0                
Investment, Identifier [Axis]: Registrar Intermediate, LLC and PSP Registrar Co-Investment Fund, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1105.00% [5]   1105.00% [5]   9.38% [1] 1105.00% [5] 1105.00% [5] 1105.00% [5] 1105.00% [5] 9.38% [1] 9.38% [1] 9.38% [1] 9.38% [1]
Total first lien senior secured loans $ 2.7 [2],[3]   $ 2.7 [2],[3]   $ 2.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.6 [2],[3]   $ 2.6 [2],[3]   2.7 [6],[7]                
Investment, Identifier [Axis]: Registrar Intermediate, LLC and PSP Registrar Co-Investment Fund, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1093.00%   1093.00%     1093.00% 1093.00% 1093.00% 1093.00%        
Total first lien senior secured loans [2],[3] $ 1.4   $ 1.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.3   1.3                    
Investment, Identifier [Axis]: Registrar Intermediate, LLC and PSP Registrar Co-Investment Fund, L.P., Limited partner interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.8 [3]   1.8 [3]   2.6 [7]                
Investment, Identifier [Axis]: Relativity ODA LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.8   3.8   3.8                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.8   3.8   3.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.8   $ 3.8   3.8                
Investment, Identifier [Axis]: Relativity ODA LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1192.00%   1192.00%     1192.00% 1192.00% 1192.00% 1192.00%        
Total first lien senior secured loans $ 23.0 [2],[3]   $ 23.0 [2],[3]   22.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 23.0 [2],[3]   23.0 [2],[3]   22.5 [6],[7]                
Investment, Identifier [Axis]: Repairify, Inc. and Repairify Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.3   7.3   7.3                
Less: funded commitments (4.8)   (4.8)   0.0                
Total unfunded commitments 2.5   2.5   7.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.5   2.5   7.3                
Investment, Identifier [Axis]: Repairify, Inc. and Repairify Holdings, LLC, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.3 [3]   $ 4.3 [3]   4.4 [7]                
Investment, Identifier [Axis]: Repairify, Inc. and Repairify Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1043.00%   1043.00%     1043.00% 1043.00% 1043.00% 1043.00%        
Total first lien senior secured loans [2],[3] $ 4.8   $ 4.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 4.7   4.7                    
Investment, Identifier [Axis]: Revalize, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.9   0.9   0.9                
Less: funded commitments (0.1)   (0.1)   0.0                
Total unfunded commitments 0.8   0.8   0.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.8   $ 0.8   $ 0.9                
Investment, Identifier [Axis]: Revalize, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1129.00%   1129.00%     1129.00% 1129.00% 1129.00% 1129.00%        
Total first lien senior secured loans [2],[3] $ 0.7   $ 0.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.7   $ 0.7                    
Investment, Identifier [Axis]: Revalize, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.48%         10.48% 10.48% 10.48% 10.48%
Total first lien senior secured loans [6],[7]         $ 0.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 0.6                
Investment, Identifier [Axis]: Revalize, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.46%         10.46% 10.46% 10.46% 10.46%
Total first lien senior secured loans [7]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         0.0                
Investment, Identifier [Axis]: Revalize, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1130.00%   1130.00%     1130.00% 1130.00% 1130.00% 1130.00%        
Total first lien senior secured loans [2],[3] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.1   0.1                    
Investment, Identifier [Axis]: Rialto Management Group, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.3   1.3   1.3                
Less: funded commitments (0.3)   (0.3)   (0.2)                
Total unfunded commitments 1.0   1.0   1.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.0   $ 1.0   $ 1.1                
Investment, Identifier [Axis]: Rialto Management Group, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   9.88% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 0.3 [2],[3],[4]   $ 0.3 [2],[3],[4]   $ 0.3 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.3 [2],[3],[4]   $ 0.3 [2],[3],[4]   $ 0.3 [7],[8]                
Investment, Identifier [Axis]: Rialto Management Group, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   9.88% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [7],[8]                
Investment, Identifier [Axis]: Rialto Management Group, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   9.88% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 0.1 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3],[4]   0.1 [2],[3],[4]   0.1 [7],[8]                
Investment, Identifier [Axis]: Rialto Management Group, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [17]   0.0 [17]   0.0 [8],[15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   0.0 [8],[15]                
Investment, Identifier [Axis]: Riser Merger Sub, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.8   1.8   2.8                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 1.8   1.8   2.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.8   $ 1.8   $ 2.8                
Investment, Identifier [Axis]: Riser Merger Sub, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.33%         9.33% 9.33% 9.33% 9.33%
Total first lien senior secured loans [6],[7]         $ 0.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.7                
Investment, Identifier [Axis]: Riser Merger Sub, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1127.00%   1127.00%     1127.00% 1127.00% 1127.00% 1127.00%        
Total first lien senior secured loans [2],[3] $ 1.7   $ 1.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.7   $ 1.7                    
Investment, Identifier [Axis]: Riser Merger Sub, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1106.00%   1106.00%     1106.00% 1106.00% 1106.00% 1106.00%        
Total first lien senior secured loans [2],[3] $ 0.6   $ 0.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.6   $ 0.6                    
Investment, Identifier [Axis]: Riser Merger Sub, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1187.00%   1187.00%     1187.00% 1187.00% 1187.00% 1187.00%        
Total first lien senior secured loans [2],[3] $ 0.6   $ 0.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.6   $ 0.6                    
Investment, Identifier [Axis]: Riverview Power LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         8.9                
Less: funded commitments         0.0                
Total unfunded commitments         8.9                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 8.9                
Investment, Identifier [Axis]: Riverview Power LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1454.00% [5]   1454.00% [5]   13.73% [1] 1454.00% [5] 1454.00% [5] 1454.00% [5] 1454.00% [5] 13.73% [1] 13.73% [1] 13.73% [1] 13.73% [1]
Total first lien senior secured loans $ 35.1 [2],[3]   $ 35.1 [2],[3]   $ 57.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 35.1 [2],[3]   35.1 [2],[3]   57.6 [6],[7]                
Investment, Identifier [Axis]: Rodeo AcquisitionCo LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.5   2.5   6.2                
Less: funded commitments (1.9)   (1.9)   (1.3)                
Total unfunded commitments 0.6   0.6   4.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.6   $ 0.6   $ 4.9                
Investment, Identifier [Axis]: Rodeo AcquisitionCo LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1157.00% [5]   1157.00% [5]   10.38% [1] 1157.00% [5] 1157.00% [5] 1157.00% [5] 1157.00% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 16.8 [2],[3]   $ 16.8 [2],[3]   $ 16.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 16.5 [2],[3]   $ 16.5 [2],[3]   $ 16.1 [6],[7]                
Investment, Identifier [Axis]: Rodeo AcquisitionCo LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1156.00% [5]   1156.00% [5]   10.38% [1] 1156.00% [5] 1156.00% [5] 1156.00% [5] 1156.00% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 1.9 [2],[3]   $ 1.9 [2],[3]   $ 1.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.9 [2],[3]   1.9 [2],[3]   1.2 [6],[7]                
Investment, Identifier [Axis]: S Toys Holdings LLC (fka The Step2 Company, LLC)                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   (0.1)                
Fair Value 0.1   0.1   0.0                
Investment, Identifier [Axis]: S Toys Holdings LLC (fka The Step2 Company, LLC), Class B common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1   0.1   0.0 [22]                
Investment, Identifier [Axis]: S Toys Holdings LLC (fka The Step2 Company, LLC), Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0 [22]                
Investment, Identifier [Axis]: S Toys Holdings LLC (fka The Step2 Company, LLC), Warrant to purchase units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0 [22]                
Investment, Identifier [Axis]: SCI PH Parent, Inc., Series B shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.9 [3]   1.9 [3]   4.2 [7]                
Investment, Identifier [Axis]: SCIH Salt Holdings Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.5   7.5   7.5                
Less: funded commitments (0.3)   (0.3)   (2.6)                
Total unfunded commitments 7.2   7.2   4.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 7.2   7.2   $ 4.9                
Investment, Identifier [Axis]: SCIH Salt Holdings Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.15%         8.15% 8.15% 8.15% 8.15%
Total first lien senior secured loans 0.0 [17]   0.0 [17]   $ 2.3 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   2.2 [6],[7],[14]                
Investment, Identifier [Axis]: SCM Insurance Services Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.0   4.0   4.0                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.0   4.0   4.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.0   $ 4.0   $ 4.0                
Investment, Identifier [Axis]: SCM Insurance Services Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1176.00% [5]   1176.00% [5]   11.16% [1] 1176.00% [5] 1176.00% [5] 1176.00% [5] 1176.00% [5] 11.16% [1] 11.16% [1] 11.16% [1] 11.16% [1]
Total first lien senior secured loans $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 61.1 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3],[4]   $ 0.1 [2],[3],[4]   $ 61.1 [6],[7],[8]                
Investment, Identifier [Axis]: SE1 Generation, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         12.25%         12.25% 12.25% 12.25% 12.25%
Total first lien senior secured loans [7]         $ 57.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         57.5                
Investment, Identifier [Axis]: SFE Intermediate Holdco LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         15.2                
Less: funded commitments         (8.3)                
Total unfunded commitments         6.9                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 6.9                
Investment, Identifier [Axis]: SFE Intermediate Holdco LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1154.00% [5]   1154.00% [5]   9.48% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 9.48% [1] 9.48% [1] 9.48% [1] 9.48% [1]
Total first lien senior secured loans $ 6.2 [2]   $ 6.2 [2]   $ 10.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.1 [2]   $ 6.1 [2]   $ 9.8 [6],[7]                
Investment, Identifier [Axis]: SFE Intermediate Holdco LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1154.00% [5]   1154.00% [5]   9.48% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 9.48% [1] 9.48% [1] 9.48% [1] 9.48% [1]
Total first lien senior secured loans $ 9.9 [2],[3]   $ 9.9 [2],[3]   $ 6.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.8 [2],[3]   $ 9.8 [2],[3]   $ 6.1 [6],[7]                
Investment, Identifier [Axis]: SFE Intermediate Holdco LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1154.00% [5]   1154.00% [5]   9.48% [1] 1154.00% [5] 1154.00% [5] 1154.00% [5] 1154.00% [5] 9.48% [1] 9.48% [1] 9.48% [1] 9.48% [1]
Total first lien senior secured loans $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 0.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.4 [2],[3]   $ 0.4 [2],[3]   $ 0.4 [6],[7]                
Investment, Identifier [Axis]: SFE Intermediate Holdco LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.48%         9.48% 9.48% 9.48% 9.48%
Total first lien senior secured loans [6],[7]         $ 8.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 8.1                
Investment, Identifier [Axis]: SG Acquisition, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   9.17% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 9.17% [1] 9.17% [1] 9.17% [1] 9.17% [1]
Total first lien senior secured loans $ 33.8 [2],[3]   $ 33.8 [2],[3]   $ 33.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 33.5 [2],[3]   33.5 [2],[3]   33.5 [6],[7]                
Investment, Identifier [Axis]: SHO Holding I Corporation, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7],[9]         124.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[9]         82.4                
Investment, Identifier [Axis]: SHO Holding I Corporation, Shoes For Crews (Europe) Limited and Never Slip TopCo, Inc.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     18.0                    
Redemptions (cost)     8.0                    
Sales (cost)     0.0                    
Interest income     0.7                    
Capital structuring service fees     0.0                    
Dividend income     0.0                    
Other income     0.0                    
Net realized gains (losses):     0.0                    
Net unrealized gains (losses):     (21.4)                    
Fair Value 59.9   59.9                    
Investment, Identifier [Axis]: SHO Holding I Corporation, Shoes For Crews (Europe) Limited and Never Slip TopCo, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: SHO Holding I Corporation, Shoes For Crews (Europe) Limited and Never Slip TopCo, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [2],[3],[4] 18.7   18.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 15.8   15.8                    
Investment, Identifier [Axis]: SHO Holding I Corporation, Shoes For Crews (Europe) Limited and Never Slip TopCo, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [3],[12] 129.8   129.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[12] 44.1   44.1                    
Investment, Identifier [Axis]: SHO Holding I Corporation, Shoes For Crews (Europe) Limited and Never Slip TopCo, Inc., Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: SHO Holding I Corporation, Shoes For Crews (Europe) Limited and Never Slip TopCo, Inc., Warrant to purchase shares of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: SM Wellness Holdings, Inc. and SM Holdco, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         3.8                
Less: funded commitments         0.0                
Total unfunded commitments         3.8                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         3.8                
Investment, Identifier [Axis]: SM Wellness Holdings, Inc. and SM Holdco, Inc., Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         0.1                
Investment, Identifier [Axis]: SM Wellness Holdings, Inc. and SM Holdco, Inc., Series B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         9.3                
Investment, Identifier [Axis]: SM Wellness Holdings, Inc. and SM Holdco, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.8   3.8                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 3.8   3.8                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 3.8   3.8                    
Investment, Identifier [Axis]: SM Wellness Holdings, Inc. and SM Holdco, LLC, Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 11.2   11.2                    
Investment, Identifier [Axis]: SM Wellness Holdings, Inc. and SM Holdco, LLC, Series B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: SM Wellness Holdings, Inc. and SM Holdco, LLC, Series D units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 1.2   1.2                    
Investment, Identifier [Axis]: SOC Telemed, Inc. and PSC Spark Holdings, LP, Class A-2 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.8 [3]   4.8 [3]   4.8 [7]                
Investment, Identifier [Axis]: SOC Telemed, Inc. and PSC Spark Holdings, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [2],[3] 92.7   92.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 89.0   89.0                    
Investment, Identifier [Axis]: SOC Telemed, Inc. and PSC Spark Holdings, LP, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [6],[7]         61.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 56.2                
Investment, Identifier [Axis]: SOC Telemed, Inc. and PSC Spark Holdings, LP, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.19%         12.19% 12.19% 12.19% 12.19%
Total first lien senior secured loans [6],[7]         $ 22.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         20.9                
Investment, Identifier [Axis]: SOC Telemed, Inc. and PSC Spark Holdings, LP, Warrant to purchase Class A-2 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         4.7                
Investment, Identifier [Axis]: SOC Telemed, Inc. and PSC Spark Holdings, LP, Warrant to purchase units of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 3.3   3.3                    
Investment, Identifier [Axis]: SSE Buyer, Inc., Supply Source Enterprises, Inc., Impact Products LLC, The Safety Zone, LLC and SSE Parent, LP, Limited partnership class A-1 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0 [7]                
Investment, Identifier [Axis]: SSE Buyer, Inc., Supply Source Enterprises, Inc., Impact Products LLC, The Safety Zone, LLC and SSE Parent, LP, Limited partnership class A-2 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0 [7]                
Investment, Identifier [Axis]: SSE Buyer, Inc., Supply Source Enterprises, Inc., Impact Products LLC, The Safety Zone, LLC and SSE Parent, LP, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 24.3 [3],[12]   24.3 [3],[12]   21.0 [7],[9]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.0 [3],[12]   4.0 [3],[12]   14.3 [7],[9]                
Investment, Identifier [Axis]: SV-Burton Holdings, LLC and LBC Breeze Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         3.3                
Less: funded commitments         0.0                
Total unfunded commitments         3.3                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         3.3                
Investment, Identifier [Axis]: SV-Burton Holdings, LLC and LBC Breeze Holdings LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [16]         $ 4.8                
Investment, Identifier [Axis]: SV-Burton Holdings, LLC and LBC Breeze Holdings LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.93%         9.93% 9.93% 9.93% 9.93%
Total first lien senior secured loans [6],[7],[16]         $ 1.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         1.3                
Investment, Identifier [Axis]: SVP-Singer Holdings Inc. and SVP-Singer Holdings LP, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   $ 4.0 [7]                
Investment, Identifier [Axis]: SVP-Singer Holdings Inc. and SVP-Singer Holdings LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         11.48%         11.48% 11.48% 11.48% 11.48%
Total first lien senior secured loans 44.1 [3],[12]   44.1 [3],[12]   $ 44.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 30.0 [3],[12]   $ 30.0 [3],[12]   $ 36.4 [6],[7]                
Investment, Identifier [Axis]: Safe Home Security, Inc., Security Systems Inc., Safe Home Monitoring, Inc., National Protective Services, Inc., Bright Integrations LLC and Medguard Alert, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1268.00% [5]   1268.00% [5]   11.63% [1] 1268.00% [5] 1268.00% [5] 1268.00% [5] 1268.00% [5] 11.63% [1] 11.63% [1] 11.63% [1] 11.63% [1]
Total first lien senior secured loans $ 47.5 [2],[3]   $ 47.5 [2],[3]   $ 47.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 47.5 [2],[3]   47.5 [2],[3]   47.9 [6],[7]                
Investment, Identifier [Axis]: SageSure Holdings, LLC & Insight Catastrophe Group, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         10.5                
Less: funded commitments         (5.9)                
Total unfunded commitments         4.6                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 4.6                
Investment, Identifier [Axis]: SageSure Holdings, LLC & Insight Catastrophe Group, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         10.13%         10.13% 10.13% 10.13% 10.13%
Total first lien senior secured loans [6],[7]         $ 14.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 13.9                
Investment, Identifier [Axis]: SageSure Holdings, LLC & Insight Catastrophe Group, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.14%         10.14% 10.14% 10.14% 10.14%
Total first lien senior secured loans [6],[7]         $ 5.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         5.9                
Investment, Identifier [Axis]: SageSure Holdings, LLC & Insight Catastrophe Group, LLC, Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         16.0                
Investment, Identifier [Axis]: SageSure Holdings, LLC and SageSure LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.1   3.1                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 3.1   3.1                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.1   $ 3.1                    
Investment, Identifier [Axis]: SageSure Holdings, LLC and SageSure LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1136.00%   1136.00%     1136.00% 1136.00% 1136.00% 1136.00%        
Total first lien senior secured loans [2],[3] $ 0.7   $ 0.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.7   0.7                    
Investment, Identifier [Axis]: SageSure Holdings, LLC and SageSure LLC, Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 29.2   $ 29.2                    
Investment, Identifier [Axis]: Saturn Purchaser Corp., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1092.00%   1092.00%     1092.00% 1092.00% 1092.00% 1092.00%        
Total first lien senior secured loans [2],[3] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.1   $ 0.1                    
Investment, Identifier [Axis]: Saturn Purchaser Corp., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1101.00%   1101.00%     1101.00% 1101.00% 1101.00% 1101.00%        
Total first lien senior secured loans [2],[3] $ 1.7   $ 1.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.7   1.7                    
Investment, Identifier [Axis]: Schill Landscaping and Lawn Care Services LLC, Tender Lawn Care ULC and Landscape Parallel Partners, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.3   3.3   4.6                
Less: funded commitments (0.8)   (0.8)   (0.2)                
Total unfunded commitments 2.5   2.5   4.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.5   2.5   4.4                
Investment, Identifier [Axis]: Schill Landscaping and Lawn Care Services LLC, Tender Lawn Care ULC and Landscape Parallel Partners, L.P., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 16.6 [3]   $ 16.6 [3]   $ 14.7 [7]                
Investment, Identifier [Axis]: Schill Landscaping and Lawn Care Services LLC, Tender Lawn Care ULC and Landscape Parallel Partners, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1117.00% [5]   1117.00% [5]   10.14% [1] 1117.00% [5] 1117.00% [5] 1117.00% [5] 1117.00% [5] 10.14% [1] 10.14% [1] 10.14% [1] 10.14% [1]
Total first lien senior secured loans $ 1.9 [2],[3]   $ 1.9 [2],[3]   $ 0.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.9 [2],[3]   $ 1.9 [2],[3]   $ 0.6 [6],[7]                
Investment, Identifier [Axis]: Schill Landscaping and Lawn Care Services LLC, Tender Lawn Care ULC and Landscape Parallel Partners, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1117.00% [5]   1117.00% [5]   10.14% [1] 1117.00% [5] 1117.00% [5] 1117.00% [5] 1117.00% [5] 10.14% [1] 10.14% [1] 10.14% [1] 10.14% [1]
Total first lien senior secured loans $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 0.2 [6],[7]                
Investment, Identifier [Axis]: SelectQuote, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 13.42% [5]   13.42% [5]   12.42% [1] 13.42% [5] 13.42% [5] 13.42% [5] 13.42% [5] 12.42% [1] 12.42% [1] 12.42% [1] 12.42% [1]
Total first lien senior secured loans $ 22.1 [2],[3]   $ 22.1 [2],[3]   $ 22.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 19.9 [2],[3]   19.9 [2],[3]   19.5 [6],[7]                
Investment, Identifier [Axis]: Senior Direct Lending Program, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     110.6   317.8                
Redemptions (cost)     126.0   31.1                
Sales (cost)     0.0   0.0                
Interest income     129.3   146.3                
Capital structuring service fees     5.0   16.9                
Dividend income     0.0   0.0                
Other income     2.9   5.5                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (17.4)   (25.3)                
Fair Value 1,215.7   1,215.7   1,248.6                
Investment, Identifier [Axis]: Senior Direct Lending Program, LLC, Membership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [4]   $ 0.0 [4]   $ 0.0 [8]                
Investment, Identifier [Axis]: Senior Direct Lending Program, LLC, Subordinated certificates                          
Schedule of Investments [Line Items]                          
Coupon | Rate 13.44% [5]   13.44% [5]   12.77% [1] 13.44% [5] 13.44% [5] 13.44% [5] 13.44% [5] 12.77% [1] 12.77% [1] 12.77% [1] 12.77% [1]
Total first lien senior secured loans $ 1,266.0 [4],[23]   $ 1,266.0 [4],[23]   $ 1,274.1 [8],[24]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1,215.7 [4],[23]   $ 1,215.7 [4],[23]   $ 1,248.6 [8],[24]                
Investment, Identifier [Axis]: Service Logic Acquisition, Inc. and MSHC, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1087.00% [5]   1087.00% [5]   9.59% [1] 1087.00% [5] 1087.00% [5] 1087.00% [5] 1087.00% [5] 9.59% [1] 9.59% [1] 9.59% [1] 9.59% [1]
Total first lien senior secured loans $ 3.4 [2],[3]   $ 3.4 [2],[3]   $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.4 [2],[3]   3.4 [2],[3]   0.1                
Investment, Identifier [Axis]: Shermco Intermediate Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.5   6.5   4.0                
Less: funded commitments (0.7)   (0.7)   (2.7)                
Total unfunded commitments 5.8   5.8   1.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.8   $ 5.8   $ 1.3                
Investment, Identifier [Axis]: Shermco Intermediate Holdings, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 10.82%   10.82%     10.82% 10.82% 10.82% 10.82%        
Total first lien senior secured loans [2],[3] $ 5.2   $ 5.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 5.2   $ 5.2                    
Investment, Identifier [Axis]: Shermco Intermediate Holdings, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 10.95%   10.95%     10.95% 10.95% 10.95% 10.95%        
Total first lien senior secured loans [2],[3] $ 0.4   $ 0.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.4   $ 0.4                    
Investment, Identifier [Axis]: Shermco Intermediate Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1300.00% [5]   1300.00% [5]   10.82% [1] 1300.00% [5] 1300.00% [5] 1300.00% [5] 1300.00% [5] 10.82% [1] 10.82% [1] 10.82% [1] 10.82% [1]
Total first lien senior secured loans $ 0.7 [3]   $ 0.7 [3]   $ 2.7 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.7 [3]   0.7 [3]   2.7 [7]                
Investment, Identifier [Axis]: Shock Doctor, Inc. and Shock Doctor Holdings, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     2.7   3.2                
Redemptions (cost)     1.2   4.5                
Sales (cost)     0.0   18.9                
Interest income     0.1   0.8                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.1                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (3.5)   3.0                
Fair Value 3.8   3.8   6.0                
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.5   2.5   2.5                
Less: funded commitments (1.5)   (1.5)   0.0                
Total unfunded commitments 1.0   1.0   2.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 1.0   1.0   2.5                
Investment, Identifier [Axis]: Shock Doctor, Inc. and Shock Doctor Holdings, LLC, Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   1.8 [7],[16],[25]                
Investment, Identifier [Axis]: Shock Doctor, Inc. and Shock Doctor Holdings, LLC, Class C preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   $ 1.8 [7],[16],[25]                
Investment, Identifier [Axis]: Shock Doctor, Inc. and Shock Doctor Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1115.00% [5]   1115.00% [5]   9.84% [1] 1115.00% [5] 1115.00% [5] 1115.00% [5] 1115.00% [5] 9.84% [1] 9.84% [1] 9.84% [1] 9.84% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7],[16],[25]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   0.1 [6],[7],[16],[25]                
Investment, Identifier [Axis]: Shock Doctor, Inc. and Shock Doctor Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1300.00%   1300.00%     1300.00% 1300.00% 1300.00% 1300.00%        
Total first lien senior secured loans [2],[3] $ 1.5   $ 1.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.5   1.5                    
Investment, Identifier [Axis]: Shock Doctor, Inc. and Shock Doctor Holdings, LLC, Preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.2 [3]   2.2 [3]   2.3 [7],[16],[25]                
Investment, Identifier [Axis]: Shur-Co Acquisition, Inc. and Shur-Co Holdco, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         5.0                
Less: funded commitments         (1.8)                
Total unfunded commitments         3.2                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         3.2                
Investment, Identifier [Axis]: Shur-Co Acquisition, Inc. and Shur-Co Holdco, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 16.9 [3]   $ 16.9 [3]   $ 13.9 [7]                
Investment, Identifier [Axis]: Shur-Co Acquisition, Inc. and Shur-Co Holdco, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1095.00% [5]   1095.00% [5]   10.90% [1] 1095.00% [5] 1095.00% [5] 1095.00% [5] 1095.00% [5] 10.90% [1] 10.90% [1] 10.90% [1] 10.90% [1]
Total first lien senior secured loans $ 26.6 [2],[3]   $ 26.6 [2],[3]   $ 26.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 26.6 [2],[3]   $ 26.6 [2],[3]   $ 26.8 [6],[7]                
Investment, Identifier [Axis]: Shur-Co Acquisition, Inc. and Shur-Co Holdco, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1095.00% [5]   1095.00% [5]   10.90% [1] 1095.00% [5] 1095.00% [5] 1095.00% [5] 1095.00% [5] 10.90% [1] 10.90% [1] 10.90% [1] 10.90% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Shur-Co Acquisition, Inc. and Shur-Co Holdco, Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1139.00%   1139.00%     1139.00% 1139.00% 1139.00% 1139.00%        
Total first lien senior secured loans [2],[3] $ 6.2   $ 6.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 6.2   6.2                    
Investment, Identifier [Axis]: Shur-Co Acquisition, Inc. and Shur-Co Holdco, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.59%         10.59% 10.59% 10.59% 10.59%
Total first lien senior secured loans [6],[7]         $ 1.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         1.8                
Investment, Identifier [Axis]: Silk Holdings III Corp. and Silk Holdings I Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.1   0.1                    
Less: funded commitments (0.1)   (0.1)                    
Total unfunded commitments 0.0   0.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0                    
Investment, Identifier [Axis]: Silk Holdings III Corp. and Silk Holdings I Corp., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 15.9   $ 15.9                    
Investment, Identifier [Axis]: Silk Holdings III Corp. and Silk Holdings I Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1314.00%   1314.00%     1314.00% 1314.00% 1314.00% 1314.00%        
Total first lien senior secured loans [2],[3] $ 16.7   $ 16.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 16.2   $ 16.2                    
Investment, Identifier [Axis]: Silk Holdings III Corp. and Silk Holdings I Corp., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1139.00%   1139.00%     1139.00% 1139.00% 1139.00% 1139.00%        
Total first lien senior secured loans [2],[3] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.0   0.0                    
Investment, Identifier [Axis]: SilverBow Resources, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 13.2 [3],[4],[10]   13.2 [3],[4],[10]   28.7 [7]                
Investment, Identifier [Axis]: SiroMed Physician Services, Inc. and SiroMed Equity Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.1   7.1   7.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 7.1   7.1   7.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 7.1   7.1   7.1                
Investment, Identifier [Axis]: SiroMed Physician Services, Inc. and SiroMed Equity Holdings, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.2 [3]   $ 1.2 [3]   $ 1.2 [7]                
Investment, Identifier [Axis]: SiroMed Physician Services, Inc. and SiroMed Equity Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1014.00% [5]   1014.00% [5]   9.48% [1] 1014.00% [5] 1014.00% [5] 1014.00% [5] 1014.00% [5] 9.48% [1] 9.48% [1] 9.48% [1] 9.48% [1]
Total first lien senior secured loans $ 8.2 [2],[3]   $ 8.2 [2],[3]   $ 10.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 8.2 [2],[3]   8.2 [2],[3]   10.3 [6],[7]                
Investment, Identifier [Axis]: Smarsh Inc. and Skywalker TopCo, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.0   2.0   2.0                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.0   2.0   2.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 2.0   2.0   2.0                
Investment, Identifier [Axis]: Smarsh Inc. and Skywalker TopCo, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.2 [3]   $ 10.2 [3]   $ 8.6 [7]                
Investment, Identifier [Axis]: Smarsh Inc. and Skywalker TopCo, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1184.00% [5]   1184.00% [5]   11.29% [1] 1184.00% [5] 1184.00% [5] 1184.00% [5] 1184.00% [5] 11.29% [1] 11.29% [1] 11.29% [1] 11.29% [1]
Total first lien senior secured loans $ 1.4 [2],[3]   $ 1.4 [2],[3]   $ 11.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.4 [2],[3]   1.4 [2],[3]   11.9 [6],[7]                
Investment, Identifier [Axis]: SocialFlow, Inc., Warrant to purchase shares of Series C preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0   $ 0.0   $ 0.0                
Investment, Identifier [Axis]: Sophia, L.P., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1342.00% [5]   1342.00% [5]   12.73% [1] 1342.00% [5] 1342.00% [5] 1342.00% [5] 1342.00% [5] 12.73% [1] 12.73% [1] 12.73% [1] 12.73% [1]
Total first lien senior secured loans $ 105.9 [2],[3]   $ 105.9 [2],[3]   $ 105.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 105.9 [2],[3]   105.9 [2],[3]   103.8 [6],[7]                
Investment, Identifier [Axis]: SoundCloud Limited, Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.7 [3],[4],[10]   0.7 [3],[4],[10]   0.7 [7],[8]                
Investment, Identifier [Axis]: Spirit RR Holdings, Inc. and Winterfell Co-Invest SCSp                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.7   1.7   1.7                
Less: funded commitments (0.2)   (0.2)   0.0                
Total unfunded commitments 1.5   1.5   1.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.5   $ 1.5   $ 1.7                
Investment, Identifier [Axis]: Spirit RR Holdings, Inc. and Winterfell Co-Invest SCSp, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1191.00% [5]   1191.00% [5]   11.18% [1] 1191.00% [5] 1191.00% [5] 1191.00% [5] 1191.00% [5] 11.18% [1] 11.18% [1] 11.18% [1] 11.18% [1]
Total first lien senior secured loans $ 2.6 [2],[3]   $ 2.6 [2],[3]   $ 2.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.6 [2],[3]   $ 2.6 [2],[3]   2.5 [6],[7]                
Investment, Identifier [Axis]: Spirit RR Holdings, Inc. and Winterfell Co-Invest SCSp, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1192.00%   1192.00%     1192.00% 1192.00% 1192.00% 1192.00%        
Total first lien senior secured loans [2],[3] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.2   0.2                    
Investment, Identifier [Axis]: Spirit RR Holdings, Inc. and Winterfell Co-Invest SCSp, Limited partner interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 11.1 [3]   $ 11.1 [3]   $ 10.5 [7]                
Investment, Identifier [Axis]: Spring Insurance Solutions, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1222.00% [5]   1222.00% [5]   11.23% [1] 1222.00% [5] 1222.00% [5] 1222.00% [5] 1222.00% [5] 11.23% [1] 11.23% [1] 11.23% [1] 11.23% [1]
Total first lien senior secured loans $ 21.9 [2],[3]   $ 21.9 [2],[3]   $ 22.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 19.5 [2],[3]   19.5 [2],[3]   $ 19.6 [6],[7]                
Investment, Identifier [Axis]: Stamps.com Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.13%         10.13% 10.13% 10.13% 10.13%
Total first lien senior secured loans [6],[7]         $ 146.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         140.9                
Investment, Identifier [Axis]: Star US Bidco LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.5   8.5   8.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 8.5   8.5   8.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 8.5   8.5   8.5                
Investment, Identifier [Axis]: Startec Equity, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.0   0.0                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     0.0   0.0                
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: Startec Equity, LLC, Member interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   $ 0.0                
Investment, Identifier [Axis]: Stealth Holding LLC and UCIT Online Security Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.7   4.7                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 4.7   4.7                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.7   $ 4.7                    
Investment, Identifier [Axis]: Stealth Holding LLC and UCIT Online Security Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1217.00% [5]   1217.00% [5]   10.54% [1] 1217.00% [5] 1217.00% [5] 1217.00% [5] 1217.00% [5] 10.54% [1] 10.54% [1] 10.54% [1] 10.54% [1]
Total first lien senior secured loans $ 52.6 [2],[3],[4]   $ 52.6 [2],[3],[4]   $ 51.3 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 52.6 [2],[3],[4]   $ 52.6 [2],[3],[4]   $ 50.3 [6],[7],[8]                
Investment, Identifier [Axis]: Stealth Holding LLC and UCIT Online Security Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1425.00% [5]   1425.00% [5]   11.08% [1] 1425.00% [5] 1425.00% [5] 1425.00% [5] 1425.00% [5] 11.08% [1] 11.08% [1] 11.08% [1] 11.08% [1]
Total first lien senior secured loans $ 0.8 [2],[3],[4]   $ 0.8 [2],[3],[4]   $ 5.2 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.8 [2],[3],[4]   $ 0.8 [2],[3],[4]   $ 5.1 [6],[7],[8]                
Investment, Identifier [Axis]: Stealth Holding LLC and UCIT Online Security Inc., First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1222.00% [5]   1222.00% [5]   13.75% [1] 1222.00% [5] 1222.00% [5] 1222.00% [5] 1222.00% [5] 13.75% [1] 13.75% [1] 13.75% [1] 13.75% [1]
Total first lien senior secured loans $ 5.1 [2],[3],[4]   $ 5.1 [2],[3],[4]   $ 2.5 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.1 [2],[3],[4]   $ 5.1 [2],[3],[4]   2.4 [6],[7],[8]                
Investment, Identifier [Axis]: Stealth Holding LLC and UCIT Online Security Inc., First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1226.00%   1226.00%     1226.00% 1226.00% 1226.00% 1226.00%        
Total first lien senior secured loans [2],[3],[4] $ 7.7   $ 7.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 7.7   7.7                    
Investment, Identifier [Axis]: Storable, Inc. and EQT IX Co-Investment (E) SCSP, Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.0 [3],[4]   $ 9.0 [3],[4]   $ 7.0 [7],[8]                
Investment, Identifier [Axis]: Storable, Inc. and EQT IX Co-Investment (E) SCSP, Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1209.00% [5]   1209.00% [5]   11.54% [1] 1209.00% [5] 1209.00% [5] 1209.00% [5] 1209.00% [5] 11.54% [1] 11.54% [1] 11.54% [1] 11.54% [1]
Total first lien senior secured loans $ 42.8 [2],[3]   $ 42.8 [2],[3]   $ 42.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 41.9 [2],[3]   $ 41.9 [2],[3]   $ 41.1 [6],[7]                
Investment, Identifier [Axis]: Storable, Inc. and EQT IX Co-Investment (E) SCSP, Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1209.00% [5]   1209.00% [5]   11.54% [1] 1209.00% [5] 1209.00% [5] 1209.00% [5] 1209.00% [5] 11.54% [1] 11.54% [1] 11.54% [1] 11.54% [1]
Total first lien senior secured loans $ 10.3 [2],[3]   $ 10.3 [2],[3]   $ 10.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 10.1 [2],[3]   10.1 [2],[3]   9.9 [6],[7]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class A redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class B redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class C redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class D redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class E redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class F redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class G redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class H redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.6 [3],[4]   4.6 [3],[4]   2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Class I redeemable shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.6 [3],[4]   $ 4.6 [3],[4]   $ 2.2 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 375.00% [5]   375.00% [5]   375.00% [1] 375.00% [5] 375.00% [5] 375.00% [5] 375.00% [5] 375.00% [1] 375.00% [1] 375.00% [1] 375.00% [1]
Total first lien senior secured loans $ 65.2 [3],[4]   $ 65.2 [3],[4]   $ 66.0 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 65.2 [3],[4]   65.2 [3],[4]   66.0 [7],[8]                
Investment, Identifier [Axis]: Storm Investment S.a.r.l., Ordinary shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [3],[4]   0.2 [3],[4]   0.2 [7],[8]                
Investment, Identifier [Axis]: Sun Acquirer Corp. and Sun TopCo, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 19.6   19.6   21.6                
Less: funded commitments (0.4)   (0.4)   (0.4)                
Total unfunded commitments 19.2   19.2   21.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 19.2   19.2   21.2                
Investment, Identifier [Axis]: Sun Acquirer Corp. and Sun TopCo, LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.3 [3]   $ 8.3 [3]   $ 9.3 [7]                
Investment, Identifier [Axis]: Sun Acquirer Corp. and Sun TopCo, LP, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1118.00% [5]   1118.00% [5]   10.13% [1] 1118.00% [5] 1118.00% [5] 1118.00% [5] 1118.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 51.9 [2],[3]   $ 51.9 [2],[3]   $ 52.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 50.9 [2],[3]   $ 50.9 [2],[3]   $ 50.4 [6],[7]                
Investment, Identifier [Axis]: Sun Acquirer Corp. and Sun TopCo, LP, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1118.00% [5]   1118.00% [5]   10.13% [1] 1118.00% [5] 1118.00% [5] 1118.00% [5] 1118.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 5.3 [2],[3]   $ 5.3 [2],[3]   $ 5.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.2 [2],[3]   5.2 [2],[3]   5.2 [6],[7]                
Investment, Identifier [Axis]: Sun Acquirer Corp. and Sun TopCo, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [17]   0.0 [17]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   0.0 [15]                
Investment, Identifier [Axis]: Sundance Energy Inc.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)         0.0                
Redemptions (cost)         41.0                
Sales (cost)         0.0                
Interest income         0.0                
Capital structuring service fees         0.0                
Dividend income         0.0                
Other income         0.0                
Net realized gains (losses):         (22.6)                
Net unrealized gains (losses):         1.2                
Fair Value         0.0                
Investment, Identifier [Axis]: Sundance Group Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.0   3.0   3.0                
Less: funded commitments (1.6)   (1.6)   0.0                
Total unfunded commitments 1.4   1.4   3.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.4   $ 1.4   $ 3.0                
Investment, Identifier [Axis]: Sundance Group Holdings, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1172.00% [5]   1172.00% [5]   10.75% [1] 1172.00% [5] 1172.00% [5] 1172.00% [5] 1172.00% [5] 10.75% [1] 10.75% [1] 10.75% [1] 10.75% [1]
Total first lien senior secured loans $ 20.1 [2],[3]   $ 20.1 [2],[3]   $ 20.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 20.1 [2],[3]   $ 20.1 [2],[3]   $ 19.9 [6],[7]                
Investment, Identifier [Axis]: Sundance Group Holdings, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1177.00% [5]   1177.00% [5]   10.93% [1] 1177.00% [5] 1177.00% [5] 1177.00% [5] 1177.00% [5] 10.93% [1] 10.93% [1] 10.93% [1] 10.93% [1]
Total first lien senior secured loans $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 0.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.8 [2],[3]   $ 0.8 [2],[3]   0.8 [6],[7]                
Investment, Identifier [Axis]: Sundance Group Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1171.00%   1171.00%     1171.00% 1171.00% 1171.00% 1171.00%        
Total first lien senior secured loans [2],[3] $ 1.6   $ 1.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.6   1.6                    
Investment, Identifier [Axis]: Sunk Rock Foundry Partners LP, Hatteras Electrical Manufacturing Holding Company and Sigma Electric Manufacturing Corporation, Diecast Beacon                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.0   6.0   6.0                
Less: funded commitments (0.6)   (0.6)   (0.6)                
Total unfunded commitments 5.4   5.4   5.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 5.4   5.4   5.4                
Investment, Identifier [Axis]: Sunk Rock Foundry Partners LP, Hatteras Electrical Manufacturing Holding Company and Sigma Electric Manufacturing Corporation, Diecast Beacon, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 0.0 [3],[17]   0.0 [3],[17]   0.0 [15]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3],[17]   $ 0.0 [3],[17]   $ 0.0 [15]                
Investment, Identifier [Axis]: Sunrun Atlas Depositor 2019-2, LLC and Sunrun Atlas Holdings 2019-2, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 361.00% [5]   361.00% [5]   3.61% [1] 361.00% [5] 361.00% [5] 361.00% [5] 361.00% [5] 3.61% [1] 3.61% [1] 3.61% [1] 3.61% [1]
Total first lien senior secured loans $ 0.1 [3]   $ 0.1 [3]   $ 0.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [3]   $ 0.1 [3]   0.1 [7]                
Investment, Identifier [Axis]: Sunrun Atlas Depositor 2019-2, LLC and Sunrun Atlas Holdings 2019-2, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 12.27%   12.27%     12.27% 12.27% 12.27% 12.27%        
Total first lien senior secured loans $ 156.1 [2],[3]   $ 156.1 [2],[3]   147.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 149.9 [2],[3]   149.9 [2],[3]   136.1 [6],[7]                
Investment, Identifier [Axis]: Sunrun Luna Holdco 2021, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 75.0   75.0   75.0                
Less: funded commitments (61.2)   (61.2)   (40.7)                
Total unfunded commitments 13.8   13.8   34.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 13.8   $ 13.8   $ 34.3                
Investment, Identifier [Axis]: Sunrun Luna Holdco 2021, LLC, Senior subordinated revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 913.00% [5]   913.00% [5]   7.86% [1] 913.00% [5] 913.00% [5] 913.00% [5] 913.00% [5] 7.86% [1] 7.86% [1] 7.86% [1] 7.86% [1]
Total first lien senior secured loans $ 36.7 [3],[4]   $ 36.7 [3],[4]   $ 24.4 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 36.0 [3],[4]   $ 36.0 [3],[4]   $ 24.2 [7],[8]                
Investment, Identifier [Axis]: Sunrun Luna Holdco 2021, LLC, Senior subordinated revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1351.00% [5]   1351.00% [5]   8.95% [1] 1351.00% [5] 1351.00% [5] 1351.00% [5] 1351.00% [5] 8.95% [1] 8.95% [1] 8.95% [1] 8.95% [1]
Total first lien senior secured loans $ 24.5 [3],[4]   $ 24.5 [3],[4]   $ 16.3 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 24.0 [3],[4]   $ 24.0 [3],[4]   $ 16.1 [7],[8]                
Investment, Identifier [Axis]: Sunrun Xanadu Issuer 2019-1, LLC and Sunrun Xanadu Holdings 2019-1, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 398.00% [5]   398.00% [5]   3.98% [1] 398.00% [5] 398.00% [5] 398.00% [5] 398.00% [5] 3.98% [1] 3.98% [1] 3.98% [1] 3.98% [1]
Total first lien senior secured loans $ 0.3 [3]   $ 0.3 [3]   $ 0.3 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.3 [3]   $ 0.3 [3]   $ 0.3 [7]                
Investment, Identifier [Axis]: Sunrun Xanadu Issuer 2019-1, LLC and Sunrun Xanadu Holdings 2019-1, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon 10.00% [5]   10.00% [5]   10.00% [1] 10.00% [5] 10.00% [5] 10.00% [5] 10.00% [5] 10.00% [1] 10.00% [1] 10.00% [1] 10.00% [1]
Total first lien senior secured loans $ 75.4 [2],[3]   $ 75.4 [2],[3]   $ 72.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 69.4 [2],[3]   69.4 [2],[3]   67.3 [6],[7]                
Investment, Identifier [Axis]: Symplr Software Inc. and Symplr Software Intermediate Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.0   7.0   7.0                
Less: funded commitments (0.5)   (0.5)   (3.1)                
Total unfunded commitments 6.5   6.5   3.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 6.5   $ 6.5   $ 3.9                
Investment, Identifier [Axis]: Symplr Software Inc. and Symplr Software Intermediate Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 997.00% [5]   997.00% [5]   8.69% [1] 997.00% [5] 997.00% [5] 997.00% [5] 997.00% [5] 8.69% [1] 8.69% [1] 8.69% [1] 8.69% [1]
Total first lien senior secured loans $ 12.3 [2],[3],[10]   $ 12.3 [2],[3],[10]   $ 12.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.9 [2],[3],[10]   $ 10.9 [2],[3],[10]   $ 10.5 [6],[7]                
Investment, Identifier [Axis]: Symplr Software Inc. and Symplr Software Intermediate Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1125.00% [5]   1125.00% [5]   10.25% [1] 1125.00% [5] 1125.00% [5] 1125.00% [5] 1125.00% [5] 10.25% [1] 10.25% [1] 10.25% [1] 10.25% [1]
Total first lien senior secured loans $ 0.5 [3]   $ 0.5 [3]   $ 3.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.4 [3]   $ 0.4 [3]   $ 2.6 [7]                
Investment, Identifier [Axis]: Symplr Software Inc. and Symplr Software Intermediate Holdings, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1334.00% [5]   1334.00% [5]   12.07% [1] 1334.00% [5] 1334.00% [5] 1334.00% [5] 1334.00% [5] 12.07% [1] 12.07% [1] 12.07% [1] 12.07% [1]
Total first lien senior secured loans $ 76.2 [2],[3]   $ 76.2 [2],[3]   $ 76.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 69.4 [2],[3]   69.4 [2],[3]   64.8 [6],[7]                
Investment, Identifier [Axis]: Symplr Software Inc. and Symplr Software Intermediate Holdings, Inc., Series C-1 preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 84.5 [3]   84.5 [3]   73.1 [7]                
Investment, Identifier [Axis]: Symplr Software Inc. and Symplr Software Intermediate Holdings, Inc., Series C-2 preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 42.3 [3]   42.3 [3]   36.6 [7]                
Investment, Identifier [Axis]: Symplr Software Inc. and Symplr Software Intermediate Holdings, Inc., Series C-3 preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 16.5 [3]   16.5 [3]   14.3 [7]                
Investment, Identifier [Axis]: Synergy HomeCare Franchising, LLC and NP/Synergy Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.2   4.2   4.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 4.2   4.2   4.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 4.2   4.2   4.2                
Investment, Identifier [Axis]: Synergy HomeCare Franchising, LLC and NP/Synergy Holdings, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.1   $ 1.1   $ 1.0                
Investment, Identifier [Axis]: Synergy HomeCare Franchising, LLC and NP/Synergy Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.48% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 13.1 [2],[3]   $ 13.1 [2],[3]   $ 13.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 13.1 [2],[3]   13.1 [2],[3]   13.1 [6],[7]                
Investment, Identifier [Axis]: Systems Planning and Analysis, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.0   4.0                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 4.0   4.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.0   $ 4.0                    
Investment, Identifier [Axis]: Systems Planning and Analysis, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1149.00%   1149.00%     1149.00% 1149.00% 1149.00% 1149.00%        
Total first lien senior secured loans [2],[3] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.0   1.0                    
Investment, Identifier [Axis]: TA/WEG Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.0   2.0   2.0                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 2.0   2.0   2.0                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.0   $ 2.0   $ 2.0                
Investment, Identifier [Axis]: TA/WEG Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1050.00% [5]   1050.00% [5]   9.98% [1] 1050.00% [5] 1050.00% [5] 1050.00% [5] 1050.00% [5] 9.98% [1] 9.98% [1] 9.98% [1] 9.98% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [7]                
Investment, Identifier [Axis]: TA/WEG Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1126.00% [5]   1126.00% [5]   9.41% [1] 1126.00% [5] 1126.00% [5] 1126.00% [5] 1126.00% [5] 9.41% [1] 9.41% [1] 9.41% [1] 9.41% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [7]                
Investment, Identifier [Axis]: TA/WEG Holdings, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1067.00% [5]   1067.00% [5]   10.75% [1] 1067.00% [5] 1067.00% [5] 1067.00% [5] 1067.00% [5] 10.75% [1] 10.75% [1] 10.75% [1] 10.75% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [7]                
Investment, Identifier [Axis]: TA/WEG Holdings, LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1079.00% [5]   1079.00% [5]   10.46% [1] 1079.00% [5] 1079.00% [5] 1079.00% [5] 1079.00% [5] 10.46% [1] 10.46% [1] 10.46% [1] 10.46% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [7]                
Investment, Identifier [Axis]: TCP Hawker Intermediate LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.2   10.2   0.3                
Less: funded commitments 0.0   0.0   (0.1)                
Total unfunded commitments 10.2   10.2   0.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 10.2   $ 10.2   $ 0.2                
Investment, Identifier [Axis]: TCP Hawker Intermediate LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1079.00% [5]   1079.00% [5]   9.98% [1] 1079.00% [5] 1079.00% [5] 1079.00% [5] 1079.00% [5] 9.98% [1] 9.98% [1] 9.98% [1] 9.98% [1]
Total first lien senior secured loans $ 34.2 [2],[3]   $ 34.2 [2],[3]   $ 34.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 34.2 [2],[3]   $ 34.2 [2],[3]   $ 34.4 [6],[7]                
Investment, Identifier [Axis]: TCP Hawker Intermediate LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1079.00% [5]   1079.00% [5]   9.98% [1] 1079.00% [5] 1079.00% [5] 1079.00% [5] 1079.00% [5] 9.98% [1] 9.98% [1] 9.98% [1] 9.98% [1]
Total first lien senior secured loans $ 6.5 [2],[3]   $ 6.5 [2],[3]   $ 6.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.5 [2],[3]   $ 6.5 [2],[3]   $ 6.5 [6],[7]                
Investment, Identifier [Axis]: TCP Hawker Intermediate LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1079.00%   1079.00%     1079.00% 1079.00% 1079.00% 1079.00%        
Total first lien senior secured loans [2],[3] $ 0.1   $ 0.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.1   0.1                    
Investment, Identifier [Axis]: TCP Hawker Intermediate LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.57%         9.57% 9.57% 9.57% 9.57%
Total first lien senior secured loans [6],[7]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.1                
Investment, Identifier [Axis]: THG Acquisition, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 11.2   11.2   18.2                
Less: funded commitments (1.3)   (1.3)   0.0                
Total unfunded commitments 9.9   9.9   18.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 9.9   $ 9.9   $ 18.2                
Investment, Identifier [Axis]: THG Acquisition, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1117.00% [5]   1117.00% [5]   9.88% [1] 1117.00% [5] 1117.00% [5] 1117.00% [5] 1117.00% [5] 9.88% [1] 9.88% [1] 9.88% [1] 9.88% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 17.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 16.7 [6],[7]                
Investment, Identifier [Axis]: THG Acquisition, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1117.00% [5]   1117.00% [5]   10.13% [1] 1117.00% [5] 1117.00% [5] 1117.00% [5] 1117.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 14.8 [2],[3]   $ 14.8 [2],[3]   $ 14.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 14.8 [2],[3]   $ 14.8 [2],[3]   $ 14.7 [6],[7]                
Investment, Identifier [Axis]: THG Acquisition, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   10.13% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 23.9 [2],[3]   $ 23.9 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 23.7 [2],[3]   $ 23.7 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: THG Acquisition, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1117.00%   1117.00%     1117.00% 1117.00% 1117.00% 1117.00%        
Total first lien senior secured loans [2],[3] $ 1.3   $ 1.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.3   1.3                    
Investment, Identifier [Axis]: TSS Buyer, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.2   1.2                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 1.2   1.2                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.2   $ 1.2                    
Investment, Identifier [Axis]: TSS Buyer, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 1104.00%   1104.00%     1104.00% 1104.00% 1104.00% 1104.00%        
Total first lien senior secured loans [2],[3] $ 1.4   $ 1.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 1.4   1.4                    
Investment, Identifier [Axis]: Tamarack Intermediate, L.L.C. and Tamarack Parent, L.L.C.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.5   7.5   7.5                
Less: funded commitments (1.2)   (1.2)   (1.3)                
Total unfunded commitments 6.3   6.3   6.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 6.3   6.3   6.2                
Investment, Identifier [Axis]: Tamarack Intermediate, L.L.C. and Tamarack Parent, L.L.C., Class A-2 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.4   $ 5.4   $ 5.9                
Investment, Identifier [Axis]: Tamarack Intermediate, L.L.C. and Tamarack Parent, L.L.C., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1131.00% [5]   1131.00% [5]   9.48% [1] 1131.00% [5] 1131.00% [5] 1131.00% [5] 1131.00% [5] 9.48% [1] 9.48% [1] 9.48% [1] 9.48% [1]
Total first lien senior secured loans $ 34.9 [2],[3]   $ 34.9 [2],[3]   $ 35.1 [6]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 34.5 [2],[3]   $ 34.5 [2],[3]   $ 35.1 [6]                
Investment, Identifier [Axis]: Tamarack Intermediate, L.L.C. and Tamarack Parent, L.L.C., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1131.00% [5]   1131.00% [5]   10.17% [1] 1131.00% [5] 1131.00% [5] 1131.00% [5] 1131.00% [5] 10.17% [1] 10.17% [1] 10.17% [1] 10.17% [1]
Total first lien senior secured loans $ 1.2 [2],[3]   $ 1.2 [2],[3]   $ 1.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.2 [2],[3]   1.2 [2],[3]   1.3 [6],[7]                
Investment, Identifier [Axis]: Taymax Group, L.P., Taymax Group G.P., LLC, PF Salem Canada ULC and TCP Fit Parent, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.7   1.7   1.7                
Less: funded commitments (0.7)   (0.7)   (0.8)                
Total unfunded commitments 1.0   1.0   0.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 1.0   1.0   0.9                
Investment, Identifier [Axis]: Taymax Group, L.P., Taymax Group G.P., LLC, PF Salem Canada ULC and TCP Fit Parent, L.P., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 7.4   $ 7.4   $ 4.6 [16]                
Investment, Identifier [Axis]: Taymax Group, L.P., Taymax Group G.P., LLC, PF Salem Canada ULC and TCP Fit Parent, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [1]         8.92%         8.92% 8.92% 8.92% 8.92%
Total first lien senior secured loans [6],[7],[16]         $ 1.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         $ 1.4                
Investment, Identifier [Axis]: Taymax Group, L.P., Taymax Group G.P., LLC, PF Salem Canada ULC and TCP Fit Parent, L.P., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1092.00%   1092.00%     1092.00% 1092.00% 1092.00% 1092.00%        
Total first lien senior secured loans [2],[3] $ 0.3   $ 0.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.3   $ 0.3                    
Investment, Identifier [Axis]: Taymax Group, L.P., Taymax Group G.P., LLC, PF Salem Canada ULC and TCP Fit Parent, L.P., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1092.00%   1092.00%     1092.00% 1092.00% 1092.00% 1092.00%        
Total first lien senior secured loans [2],[3] $ 1.0   $ 1.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.0   $ 1.0                    
Investment, Identifier [Axis]: Taymax Group, L.P., Taymax Group G.P., LLC, PF Salem Canada ULC and TCP Fit Parent, L.P., First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon 1089.00% [5]   1089.00% [5]   9.51% [1] 1089.00% [5] 1089.00% [5] 1089.00% [5] 1089.00% [5] 9.51% [1] 9.51% [1] 9.51% [1] 9.51% [1]
Total first lien senior secured loans $ 0.6 [2],[3]   $ 0.6 [2],[3]   $ 0.4 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.6 [2],[3]   $ 0.6 [2],[3]   $ 0.4 [6],[7],[16]                
Investment, Identifier [Axis]: Taymax Group, L.P., Taymax Group G.P., LLC, PF Salem Canada ULC and TCP Fit Parent, L.P., First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon 1102.00% [5]   1102.00% [5]   10.05% [1] 1102.00% [5] 1102.00% [5] 1102.00% [5] 1102.00% [5] 10.05% [1] 10.05% [1] 10.05% [1] 10.05% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.4 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.4 [6],[7],[16]                
Investment, Identifier [Axis]: Teasdale Foods, Inc. and Familia Group Holdings Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 12.84% [5]   12.84% [5]   12.29% [1] 12.84% [5] 12.84% [5] 12.84% [5] 12.84% [5] 12.29% [1] 12.29% [1] 12.29% [1] 12.29% [1]
Total first lien senior secured loans $ 76.1 [2],[3]   $ 76.1 [2],[3]   $ 75.9 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 68.5 [2],[3]   68.5 [2],[3]   65.3 [6],[7]                
Investment, Identifier [Axis]: Teasdale Foods, Inc. and Familia Group Holdings Inc., Warrant to purchase shares of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   $ 0.0                
Investment, Identifier [Axis]: Tempus Labs, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.49%         10.49% 10.49% 10.49% 10.49%
Total first lien senior secured loans [6],[7]         $ 71.4                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         69.6                
Investment, Identifier [Axis]: Tempus Labs, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 13.50%   13.50%     13.50% 13.50% 13.50% 13.50%        
Total first lien senior secured loans [2],[3] $ 72.0   $ 72.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 72.0   $ 72.0                    
Investment, Identifier [Axis]: Tempus Labs, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 13.64%   13.64%     13.64% 13.64% 13.64% 13.64%        
Total first lien senior secured loans [2],[3] $ 21.1   $ 21.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 21.1   21.1                    
Investment, Identifier [Axis]: TerSera Therapeutics LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.1                
Less: funded commitments         0.0                
Total unfunded commitments         0.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.1                
Investment, Identifier [Axis]: TerSera Therapeutics LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.98%         9.98% 9.98% 9.98% 9.98%
Total first lien senior secured loans [6],[7]         $ 5.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 5.0                
Investment, Identifier [Axis]: TerSera Therapeutics LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.98%         9.98% 9.98% 9.98% 9.98%
Total first lien senior secured loans [6],[7]         $ 2.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 2.0                
Investment, Identifier [Axis]: TerSera Therapeutics LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.98%         9.98% 9.98% 9.98% 9.98%
Total first lien senior secured loans [6],[7]         $ 1.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         1.8                
Investment, Identifier [Axis]: The Alaska Club Partners, LLC, Athletic Club Partners LLC and The Alaska Club, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.1   1.1   1.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 1.1   1.1   1.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 1.1   $ 1.1   $ 1.1                
Investment, Identifier [Axis]: The Alaska Club Partners, LLC, Athletic Club Partners LLC and The Alaska Club, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 1198.00% [5]   1198.00% [5]   14.00% [1] 1198.00% [5] 1198.00% [5] 1198.00% [5] 1198.00% [5] 14.00% [1] 14.00% [1] 14.00% [1] 14.00% [1]
Total first lien senior secured loans $ 12.4 [2],[3]   $ 12.4 [2],[3]   $ 12.5 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 12.4 [2],[3]   12.4 [2],[3]   12.5 [6],[7],[16]                
Investment, Identifier [Axis]: The Arcticom Group, LLC and AMCP Mechanical Holdings, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 13.6   13.6   12.6                
Less: funded commitments (8.8)   (8.8)   (11.5)                
Total unfunded commitments 4.8   4.8   1.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 4.8   4.8   1.1                
Investment, Identifier [Axis]: The Arcticom Group, LLC and AMCP Mechanical Holdings, LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.7   11.7   $ 8.5 [16]                
Investment, Identifier [Axis]: The Arcticom Group, LLC and AMCP Mechanical Holdings, LP, Class C units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.6   $ 0.6                    
Investment, Identifier [Axis]: The Arcticom Group, LLC and AMCP Mechanical Holdings, LP, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1181.00% [5]   1181.00% [5]   9.57% [1] 1181.00% [5] 1181.00% [5] 1181.00% [5] 1181.00% [5] 9.57% [1] 9.57% [1] 9.57% [1] 9.57% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7],[16]                
Investment, Identifier [Axis]: The Arcticom Group, LLC and AMCP Mechanical Holdings, LP, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1193.00% [5]   1193.00% [5]   11.08% [1] 1193.00% [5] 1193.00% [5] 1193.00% [5] 1193.00% [5] 11.08% [1] 11.08% [1] 11.08% [1] 11.08% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7],[16]                
Investment, Identifier [Axis]: The Arcticom Group, LLC and AMCP Mechanical Holdings, LP, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1229.00%   1229.00%     1229.00% 1229.00% 1229.00% 1229.00%        
Total first lien senior secured loans [2],[3] $ 1.6   $ 1.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 1.6   $ 1.6                    
Investment, Identifier [Axis]: The Arcticom Group, LLC and AMCP Mechanical Holdings, LP, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.10% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.10% [1] 10.10% [1] 10.10% [1] 10.10% [1]
Total first lien senior secured loans $ 3.5 [2],[3]   $ 3.5 [2],[3]   $ 8.9 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.5 [2],[3]   $ 3.5 [2],[3]   $ 8.8 [6],[7],[16]                
Investment, Identifier [Axis]: The Arcticom Group, LLC and AMCP Mechanical Holdings, LP, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1375.00% [5]   1375.00% [5]   12.50% [1] 1375.00% [5] 1375.00% [5] 1375.00% [5] 1375.00% [5] 12.50% [1] 12.50% [1] 12.50% [1] 12.50% [1]
Total first lien senior secured loans $ 5.3 [2],[3]   $ 5.3 [2],[3]   $ 2.5 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.3 [2],[3]   $ 5.3 [2],[3]   $ 2.5 [6],[7],[16]                
Investment, Identifier [Axis]: The Edelman Financial Center, LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1218.00% [5]   1218.00% [5]   11.13% [1] 1218.00% [5] 1218.00% [5] 1218.00% [5] 1218.00% [5] 11.13% [1] 11.13% [1] 11.13% [1] 11.13% [1]
Total first lien senior secured loans $ 19.3 [3],[4],[10]   $ 19.3 [3],[4],[10]   $ 13.4 [7],[8],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 19.2 [3],[4],[10]   19.2 [3],[4],[10]   12.0 [7],[8],[11]                
Investment, Identifier [Axis]: The Mather Group, LLC, TVG-TMG Topco, Inc., and TVG-TMG Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 1.5   1.5   1.7                
Less: funded commitments (0.4)   (0.4)   (0.1)                
Total unfunded commitments 1.1   1.1   1.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 1.1   1.1   1.6                
Investment, Identifier [Axis]: The Mather Group, LLC, TVG-TMG Topco, Inc., and TVG-TMG Holdings, LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3],[4]   $ 0.0 [3],[4]   $ 0.0 [8]                
Investment, Identifier [Axis]: The Mather Group, LLC, TVG-TMG Topco, Inc., and TVG-TMG Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1159.00% [5]   1159.00% [5]   10.51% [1] 1159.00% [5] 1159.00% [5] 1159.00% [5] 1159.00% [5] 10.51% [1] 10.51% [1] 10.51% [1] 10.51% [1]
Total first lien senior secured loans $ 3.7 [2],[3],[4]   $ 3.7 [2],[3],[4]   $ 3.5 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 3.6 [2],[3],[4]   $ 3.6 [2],[3],[4]   $ 3.4 [7],[8]                
Investment, Identifier [Axis]: The Mather Group, LLC, TVG-TMG Topco, Inc., and TVG-TMG Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1350.00% [5]   1350.00% [5]   12.00% [1] 1350.00% [5] 1350.00% [5] 1350.00% [5] 1350.00% [5] 12.00% [1] 12.00% [1] 12.00% [1] 12.00% [1]
Total first lien senior secured loans $ 0.5 [2],[3],[4]   $ 0.5 [2],[3],[4]   $ 0.1 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.4 [2],[3],[4]   0.4 [2],[3],[4]   0.1 [7],[8]                
Investment, Identifier [Axis]: The Mather Group, LLC, TVG-TMG Topco, Inc., and TVG-TMG Holdings, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 3.3 [3],[4]   3.3 [3],[4]   3.0 [7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.1 [3],[4]   3.1 [3],[4]   2.9 [7],[8]                
Investment, Identifier [Axis]: The Mather Group, LLC, TVG-TMG Topco, Inc., and TVG-TMG Holdings, LLC, Series A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.5 [3],[4]   3.5 [3],[4]   4.8 [7],[8]                
Investment, Identifier [Axis]: The NPD Group, L.P., IRI Group Holdings, Inc., Information Resources, Inc. and IRI-NPD Co-Invest Aggregator, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 14.4   14.4   14.4                
Less: funded commitments (2.7)   (2.7)   (1.8)                
Total unfunded commitments 11.7   11.7   12.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 11.7   11.7   12.6                
Investment, Identifier [Axis]: The NPD Group, L.P., IRI Group Holdings, Inc., Information Resources, Inc. and IRI-NPD Co-Invest Aggregator, L.P., Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 15.0 [3]   $ 15.0 [3]   $ 15.7 [7]                
Investment, Identifier [Axis]: The NPD Group, L.P., IRI Group Holdings, Inc., Information Resources, Inc. and IRI-NPD Co-Invest Aggregator, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 11.58% [5]   11.58% [5]   10.43% [1] 11.58% [5] 11.58% [5] 11.58% [5] 11.58% [5] 10.43% [1] 10.43% [1] 10.43% [1] 10.43% [1]
Total first lien senior secured loans $ 216.6 [2],[3]   $ 216.6 [2],[3]   $ 213.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 216.6 [2],[3]   $ 216.6 [2],[3]   $ 209.3 [6],[7]                
Investment, Identifier [Axis]: The NPD Group, L.P., IRI Group Holdings, Inc., Information Resources, Inc. and IRI-NPD Co-Invest Aggregator, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.07%         10.07% 10.07% 10.07% 10.07%
Total first lien senior secured loans [6],[7],[14]         $ 1.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[14]         1.7                
Investment, Identifier [Axis]: The NPD Group, L.P., IRI Group Holdings, Inc., Information Resources, Inc. and IRI-NPD Co-Invest Aggregator, L.P., First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1108.00%   1108.00%     1108.00% 1108.00% 1108.00% 1108.00%        
Total first lien senior secured loans [2],[3],[13] $ 1.4   $ 1.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[13] $ 1.4   $ 1.4                    
Investment, Identifier [Axis]: The NPD Group, L.P., IRI Group Holdings, Inc., Information Resources, Inc. and IRI-NPD Co-Invest Aggregator, L.P., First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1325.00%   1325.00%     1325.00% 1325.00% 1325.00% 1325.00%        
Total first lien senior secured loans [2],[3],[13] $ 1.2   $ 1.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[13] 1.2   1.2                    
Investment, Identifier [Axis]: The Teaching Company Holdings, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [3]   0.2 [3]   0.0                
Investment, Identifier [Axis]: The Teaching Company Holdings, Inc., Preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 3.7 [3]   3.7 [3]   2.5 [7]                
Investment, Identifier [Axis]: The Ultimus Group Midco, LLC, The Ultimus Group, LLC, and The Ultimus Group Aggregator, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 6.9   6.9   6.9                
Less: funded commitments (0.8)   (0.8)   0.0                
Total unfunded commitments 6.1   6.1   6.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 6.1   6.1   6.9                
Investment, Identifier [Axis]: The Ultimus Group Midco, LLC, The Ultimus Group, LLC, and The Ultimus Group Aggregator, LP, Class A units 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.7   2.7   3.1                
Investment, Identifier [Axis]: The Ultimus Group Midco, LLC, The Ultimus Group, LLC, and The Ultimus Group Aggregator, LP, Class A units 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: The Ultimus Group Midco, LLC, The Ultimus Group, LLC, and The Ultimus Group Aggregator, LP, Class B units 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0   0.0   0.0                
Investment, Identifier [Axis]: The Ultimus Group Midco, LLC, The Ultimus Group, LLC, and The Ultimus Group Aggregator, LP, Class B units 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0   $ 0.0   $ 0.0                
Investment, Identifier [Axis]: The Ultimus Group Midco, LLC, The Ultimus Group, LLC, and The Ultimus Group Aggregator, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 999.00% [5]   999.00% [5]   9.23% [1] 999.00% [5] 999.00% [5] 999.00% [5] 999.00% [5] 9.23% [1] 9.23% [1] 9.23% [1] 9.23% [1]
Total first lien senior secured loans $ 37.1 [2],[3]   $ 37.1 [2],[3]   $ 37.4 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 36.4 [2],[3]   $ 36.4 [2],[3]   $ 36.7 [7]                
Investment, Identifier [Axis]: The Ultimus Group Midco, LLC, The Ultimus Group, LLC, and The Ultimus Group Aggregator, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1042.00%   1042.00%     1042.00% 1042.00% 1042.00% 1042.00%        
Total first lien senior secured loans [2],[3] $ 0.8   $ 0.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.8   $ 0.8                    
Investment, Identifier [Axis]: Therapy Brands Holdings LLC, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1218.00% [5]   1218.00% [5]   11.10% [1] 1218.00% [5] 1218.00% [5] 1218.00% [5] 1218.00% [5] 11.10% [1] 11.10% [1] 11.10% [1] 11.10% [1]
Total first lien senior secured loans $ 29.1 [2],[3]   $ 29.1 [2],[3]   $ 29.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 27.3 [2],[3]   27.3 [2],[3]   27.9 [6],[7]                
Investment, Identifier [Axis]: Thermostat Purchaser III, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 7.7   7.7   11.7                
Less: funded commitments (0.3)   (0.3)   0.0                
Total unfunded commitments 7.4   7.4   11.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 7.4   7.4   $ 11.7                
Investment, Identifier [Axis]: Thermostat Purchaser III, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [17] 0.0   0.0                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [17] $ 0.0   $ 0.0                    
Investment, Identifier [Axis]: Thermostat Purchaser III, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1282.00% [5]   1282.00% [5]   11.98% [1] 1282.00% [5] 1282.00% [5] 1282.00% [5] 1282.00% [5] 11.98% [1] 11.98% [1] 11.98% [1] 11.98% [1]
Total first lien senior secured loans $ 23.0 [2],[3]   $ 23.0 [2],[3]   $ 23.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 22.3 [2],[3]   22.3 [2],[3]   22.1 [6],[7]                
Investment, Identifier [Axis]: TibCo Software Inc., Picard Parent, Inc., Picard MidCo, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         19.0                
Less: funded commitments         0.0                
Total unfunded commitments         19.0                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 19.0                
Investment, Identifier [Axis]: TibCo Software Inc., Picard Parent, Inc., Picard MidCo, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.18%         9.18% 9.18% 9.18% 9.18%
Total first lien senior secured loans [6],[7],[11]         $ 10.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[11]         $ 9.7                
Investment, Identifier [Axis]: TibCo Software Inc., Picard Parent, Inc., Picard MidCo, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., First lien senior secured notes                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         650.00%         650.00% 650.00% 650.00% 650.00%
Total first lien senior secured loans [7],[11]         $ 88.9                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[11]         74.9                
Investment, Identifier [Axis]: TibCo Software Inc., Picard Parent, Inc., Picard MidCo, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 10.7                
Investment, Identifier [Axis]: TibCo Software Inc., Picard Parent, Inc., Picard MidCo, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.00%         9.00% 9.00% 9.00% 9.00%
Total first lien senior secured loans [6],[7]         $ 85.3                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         69.9                
Investment, Identifier [Axis]: TibCo Software Inc., Picard Parent, Inc., Picard MidCo, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P., Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         143.1                
Investment, Identifier [Axis]: Top Five Largest Portfolio Company Investments | Senior Direct Lending Program                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans 1,651.0   1,651.0   1,631.0                
Investment, Identifier [Axis]: Totes Isotoner Corporation and Totes Ultimate Holdco, Inc.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   0.0                
Redemptions (cost)     0.0   0.0                
Sales (cost)     0.0   0.0                
Interest income     0.2   0.3                
Capital structuring service fees     0.0   0.0                
Dividend income     0.0   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (0.1)   (0.2)                
Fair Value 3.5   3.5   3.7                
Investment, Identifier [Axis]: Totes Isotoner Corporation and Totes Ultimate Holdco, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [3]   $ 0.0 [3]   $ 0.2 [7],[25]                
Investment, Identifier [Axis]: Totes Isotoner Corporation and Totes Ultimate Holdco, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 943.00% [5]   943.00% [5]   10.38% [1] 943.00% [5] 943.00% [5] 943.00% [5] 943.00% [5] 10.38% [1] 10.38% [1] 10.38% [1] 10.38% [1]
Total first lien senior secured loans $ 1.6 [2],[3]   $ 1.6 [2],[3]   $ 2.2 [6],[7],[25]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.6 [2],[3]   $ 1.6 [2],[3]   $ 1.9 [6],[7],[25]                
Investment, Identifier [Axis]: Totes Isotoner Corporation and Totes Ultimate Holdco, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1145.00% [5]   1145.00% [5]   8.38% [1] 1145.00% [5] 1145.00% [5] 1145.00% [5] 1145.00% [5] 8.38% [1] 8.38% [1] 8.38% [1] 8.38% [1]
Total first lien senior secured loans $ 2.2 [2],[3]   $ 2.2 [2],[3]   $ 1.6 [6],[7],[25]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.9 [2],[3]   1.9 [2],[3]   1.6 [6],[7],[25]                
Investment, Identifier [Axis]: Touchstone Acquisition, Inc. and Touchstone Holding, L.P., Class A preferred units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.3 [3]   4.3 [3]   2.1 [7]                
Investment, Identifier [Axis]: Trader Corporation and Project Auto Finco Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.6   0.6   3.6                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 0.6   0.6   3.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.6   $ 0.6   $ 3.6                
Investment, Identifier [Axis]: Trader Corporation and Project Auto Finco Corp., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1213.00% [5]   1213.00% [5]   11.40% [1] 1213.00% [5] 1213.00% [5] 1213.00% [5] 1213.00% [5] 11.40% [1] 11.40% [1] 11.40% [1] 11.40% [1]
Total first lien senior secured loans $ 12.2 [2],[3],[4]   $ 12.2 [2],[3],[4]   $ 12.2 [6],[7],[8]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 12.2 [2],[3],[4]   $ 12.2 [2],[3],[4]   $ 11.9 [6],[7],[8]                
Investment, Identifier [Axis]: Triton Water Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 890.00% [5]   890.00% [5]   8.23% [1] 890.00% [5] 890.00% [5] 890.00% [5] 890.00% [5] 8.23% [1] 8.23% [1] 8.23% [1] 8.23% [1]
Total first lien senior secured loans $ 1.0 [2],[3],[10]   $ 1.0 [2],[3],[10]   $ 1.0 [6],[7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.0 [2],[3],[10]   $ 1.0 [2],[3],[10]   $ 0.9 [6],[7],[11]                
Investment, Identifier [Axis]: Triton Water Holdings, Inc., Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 625.00% [5]   625.00% [5]   625.00% [1] 625.00% [5] 625.00% [5] 625.00% [5] 625.00% [5] 625.00% [1] 625.00% [1] 625.00% [1] 625.00% [1]
Total first lien senior secured loans $ 0.1 [3],[10]   $ 0.1 [3],[10]   $ 0.1 [7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [3],[10]   0.1 [3],[10]   0.1 [7],[11]                
Investment, Identifier [Axis]: Triwizard Holdings, Inc. and Triwizard Parent, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 11.0   11.0                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 11.0   11.0                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 11.0   11.0                    
Investment, Identifier [Axis]: Triwizard Holdings, Inc. and Triwizard Parent, LP, Class A-2 common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 3.0   3.0                    
Investment, Identifier [Axis]: Two Six Labs, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 10.3   10.3   10.3                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 10.3   10.3   10.3                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 10.3   10.3   10.3                
Investment, Identifier [Axis]: U.S. Anesthesia Partners, Inc. & U.S. Anesthesia Partners Holdings, Inc., Common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.0 [3]   $ 10.0 [3]   $ 12.7 [7]                
Investment, Identifier [Axis]: U.S. Anesthesia Partners, Inc. & U.S. Anesthesia Partners Holdings, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1294.00% [5]   1294.00% [5]   11.62% [1] 1294.00% [5] 1294.00% [5] 1294.00% [5] 1294.00% [5] 11.62% [1] 11.62% [1] 11.62% [1] 11.62% [1]
Total first lien senior secured loans $ 147.8 [2],[3]   $ 147.8 [2],[3]   $ 147.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 136.0 [2],[3]   136.0 [2],[3]   143.3 [6],[7]                
Investment, Identifier [Axis]: UKG Inc. and H&F Unite Partners, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 25.0   25.0   25.0                
Less: funded commitments (0.1)   (0.1)   (10.8)                
Total unfunded commitments 24.9   24.9   14.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 24.9   24.9   $ 14.2                
Investment, Identifier [Axis]: UKG Inc. and H&F Unite Partners, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         8.06%         8.06% 8.06% 8.06% 8.06%
Total first lien senior secured loans 0.0 [17]   0.0 [17]   $ 10.6 [7],[8],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   10.6 [7],[8],[14]                
Investment, Identifier [Axis]: UKG Inc. and H&F Unite Partners, L.P., Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 19.3 [3],[4]   19.3 [3],[4]   14.4 [7],[8]                
Investment, Identifier [Axis]: US Salt Investors, LLC and Emerald Lake Pearl Acquisition-A, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 9.9   9.9   9.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 9.9   9.9   9.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 9.9   $ 9.9   $ 9.9                
Investment, Identifier [Axis]: US Salt Investors, LLC and Emerald Lake Pearl Acquisition-A, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1104.00% [5]   1104.00% [5]   10.23% [1] 1104.00% [5] 1104.00% [5] 1104.00% [5] 1104.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 26.2 [2],[3]   $ 26.2 [2],[3]   $ 26.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 25.9 [2],[3]   25.9 [2],[3]   25.3 [6],[7]                
Investment, Identifier [Axis]: US Salt Investors, LLC and Emerald Lake Pearl Acquisition-A, L.P., Limited partner interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.8 [3]   0.8 [3]   0.5 [7]                
Investment, Identifier [Axis]: United Digestive MSO Parent, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         18.4                
Less: funded commitments         0.0                
Total unfunded commitments         18.4                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 18.4                
Investment, Identifier [Axis]: United Digestive MSO Parent, LLC and Koln Co-Invest Unblocked, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.6   4.6                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 4.6   4.6                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 4.6   4.6                    
Investment, Identifier [Axis]: United Digestive MSO Parent, LLC and Koln Co-Invest Unblocked, LP, Class A interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.5   $ 4.5                    
Investment, Identifier [Axis]: United Digestive MSO Parent, LLC and Koln Co-Invest Unblocked, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1229.00%   1229.00%     1229.00% 1229.00% 1229.00% 1229.00%        
Total first lien senior secured loans [2],[3] $ 10.4   $ 10.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 10.4   $ 10.4                    
Investment, Identifier [Axis]: United Digestive MSO Parent, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.38%         9.38% 9.38% 9.38% 9.38%
Total first lien senior secured loans [6],[7]         $ 1.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         1.0                
Investment, Identifier [Axis]: UserZoom Technologies, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1242.00%   1242.00%     1242.00% 1242.00% 1242.00% 1242.00%        
Total first lien senior secured loans [2],[3] $ 5.8   $ 5.8                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 5.8   5.8                    
Investment, Identifier [Axis]: VCP-EDC Co-Invest, LLC, Membership units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 7.4   7.4   4.2                
Investment, Identifier [Axis]: VPP Intermediate Holdings, LLC and VPP Group Holdings, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 14.9   14.9   8.7                
Less: funded commitments (0.2)   (0.2)   0.0                
Total unfunded commitments 14.7   14.7   8.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 14.7   14.7   8.7                
Investment, Identifier [Axis]: VPP Intermediate Holdings, LLC and VPP Group Holdings, L.P., Class A-2 units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 8.6                
Investment, Identifier [Axis]: VPP Intermediate Holdings, LLC and VPP Group Holdings, L.P., Class A-2 units 1                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 10.9   10.9                    
Investment, Identifier [Axis]: VPP Intermediate Holdings, LLC and VPP Group Holdings, L.P., Class A-2 units 2                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 0.1   $ 0.1                    
Investment, Identifier [Axis]: VPP Intermediate Holdings, LLC and VPP Group Holdings, L.P., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1167.00% [5]   1167.00% [5]   10.60% [1] 1167.00% [5] 1167.00% [5] 1167.00% [5] 1167.00% [5] 10.60% [1] 10.60% [1] 10.60% [1] 10.60% [1]
Total first lien senior secured loans $ 6.2 [2],[3]   $ 6.2 [2],[3]   $ 6.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.2 [2],[3]   $ 6.2 [2],[3]   $ 6.0 [6],[7]                
Investment, Identifier [Axis]: VPP Intermediate Holdings, LLC and VPP Group Holdings, L.P., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1192.00% [5]   1192.00% [5]   10.52% [1] 1192.00% [5] 1192.00% [5] 1192.00% [5] 1192.00% [5] 10.52% [1] 10.52% [1] 10.52% [1] 10.52% [1]
Total first lien senior secured loans $ 9.2 [2],[3]   $ 9.2 [2],[3]   $ 3.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 9.2 [2],[3]   $ 9.2 [2],[3]   3.1 [6],[7]                
Investment, Identifier [Axis]: VPP Intermediate Holdings, LLC and VPP Group Holdings, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1375.00%   1375.00%     1375.00% 1375.00% 1375.00% 1375.00%        
Total first lien senior secured loans [2],[3],[13] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[13] 0.2   0.2                    
Investment, Identifier [Axis]: VPROP Operating, LLC and V SandCo, LLC                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0   6.0                
Redemptions (cost)     4.5   4.5                
Sales (cost)     0.0   0.0                
Interest income     4.6   5.0                
Capital structuring service fees     0.0   0.2                
Dividend income     6.7   0.0                
Other income     0.0   0.0                
Net realized gains (losses):     0.0   0.0                
Net unrealized gains (losses):     (8.2)   33.5                
Fair Value 103.4   103.4   116.1                
Investment, Identifier [Axis]: VPROP Operating, LLC and V SandCo, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 65.1 [3]   $ 65.1 [3]   $ 73.4 [7]                
Investment, Identifier [Axis]: VPROP Operating, LLC and V SandCo, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1509.00% [5]   1509.00% [5]   13.62% [1] 1509.00% [5] 1509.00% [5] 1509.00% [5] 1509.00% [5] 13.62% [1] 13.62% [1] 13.62% [1] 13.62% [1]
Total first lien senior secured loans $ 27.3 [2],[3]   $ 27.3 [2],[3]   $ 27.3 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 27.3 [2],[3]   $ 27.3 [2],[3]   $ 27.3 [7]                
Investment, Identifier [Axis]: VPROP Operating, LLC and V SandCo, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1509.00% [5]   1509.00% [5]   13.62% [1] 1509.00% [5] 1509.00% [5] 1509.00% [5] 1509.00% [5] 13.62% [1] 13.62% [1] 13.62% [1] 13.62% [1]
Total first lien senior secured loans $ 6.0 [2],[3]   $ 6.0 [2],[3]   $ 9.4 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.0 [2],[3]   $ 6.0 [2],[3]   $ 9.4 [7]                
Investment, Identifier [Axis]: VPROP Operating, LLC and V SandCo, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1509.00% [5]   1509.00% [5]   13.62% [1] 1509.00% [5] 1509.00% [5] 1509.00% [5] 1509.00% [5] 13.62% [1] 13.62% [1] 13.62% [1] 13.62% [1]
Total first lien senior secured loans $ 5.0 [2],[3]   $ 5.0 [2],[3]   $ 6.0 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 5.0 [2],[3]   5.0 [2],[3]   6.0 [7]                
Investment, Identifier [Axis]: VRC Companies, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.4   5.4   5.4                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 5.4   5.4   5.4                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.4   $ 5.4   $ 5.4                
Investment, Identifier [Axis]: VRC Companies, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.97%         10.97% 10.97% 10.97% 10.97%
Total first lien senior secured loans [6],[7]         $ 0.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 0.0                
Investment, Identifier [Axis]: VRC Companies, LLC, Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Coupon 12.00% [5]   12.00% [5]   12.00% [1] 12.00% [5] 12.00% [5] 12.00% [5] 12.00% [5] 12.00% [1] 12.00% [1] 12.00% [1] 12.00% [1]
Total first lien senior secured loans $ 5.1 [3]   $ 5.1 [3]   $ 5.0 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 4.8 [3]   4.8 [3]   4.7 [7]                
Investment, Identifier [Axis]: VS Buyer, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.1   8.1   8.1                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 8.1   8.1   8.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 8.1   8.1   8.1                
Investment, Identifier [Axis]: VSC Investors LLC, Membership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3],[4],[10]   0.0 [3],[4],[10]   0.5 [7],[8],[11]                
Investment, Identifier [Axis]: Varsity Brands Holding Co., Inc. and BCPE Hercules Holdings, LP, Class A Units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7]         $ 1.0                
Investment, Identifier [Axis]: Varsity Brands Holding Co., Inc. and BCPE Hercules Holdings, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         7.88%         7.88% 7.88% 7.88% 7.88%
Total first lien senior secured loans [6],[7],[11]         $ 14.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[11]         $ 14.2                
Investment, Identifier [Axis]: Varsity Brands Holding Co., Inc. and BCPE Hercules Holdings, LP, Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.63%         12.63% 12.63% 12.63% 12.63%
Total first lien senior secured loans [6],[7]         $ 122.7                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         $ 121.5                
Investment, Identifier [Axis]: Varsity Brands Holding Co., Inc. and BCPE Hercules Holdings, LP, Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.63%         12.63% 12.63% 12.63% 12.63%
Total first lien senior secured loans [6],[7]         $ 21.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         20.9                
Investment, Identifier [Axis]: Varsity Brands Holding Co., Inc., Hercules Achievement, Inc. and BCPE Hercules Holdings, LP, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] $ 1.5   $ 1.5                    
Investment, Identifier [Axis]: Varsity Brands Holding Co., Inc., Hercules Achievement, Inc. and BCPE Hercules Holdings, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1043.00%   1043.00%     1043.00% 1043.00% 1043.00% 1043.00%        
Total first lien senior secured loans [2],[3],[10] $ 14.7   $ 14.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[10] $ 14.3   $ 14.3                    
Investment, Identifier [Axis]: Varsity Brands Holding Co., Inc., Hercules Achievement, Inc. and BCPE Hercules Holdings, LP, Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 15.68%   15.68%     15.68% 15.68% 15.68% 15.68%        
Total first lien senior secured loans [2],[3] $ 145.6   $ 145.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 145.6   145.6                    
Investment, Identifier [Axis]: Verista, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 8.0   8.0   8.2                
Less: funded commitments (1.6)   (1.6)   (1.1)                
Total unfunded commitments 6.4   6.4   7.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 6.4   $ 6.4   $ 7.1                
Investment, Identifier [Axis]: Verista, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1138.00% [5]   1138.00% [5]   10.19% [1] 1138.00% [5] 1138.00% [5] 1138.00% [5] 1138.00% [5] 10.19% [1] 10.19% [1] 10.19% [1] 10.19% [1]
Total first lien senior secured loans $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 0.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.8 [2],[3]   $ 0.8 [2],[3]   $ 0.8 [6],[7]                
Investment, Identifier [Axis]: Verista, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1350.00% [5]   1350.00% [5]   10.27% [1] 1350.00% [5] 1350.00% [5] 1350.00% [5] 1350.00% [5] 10.27% [1] 10.27% [1] 10.27% [1] 10.27% [1]
Total first lien senior secured loans $ 1.6 [2],[3]   $ 1.6 [2],[3]   $ 1.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 1.6 [2],[3]   1.6 [2],[3]   1.1 [6],[7]                
Investment, Identifier [Axis]: Verscend Holding Corp.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 22.5   22.5   22.5                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 22.5   22.5   22.5                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 22.5   22.5   22.5                
Investment, Identifier [Axis]: Vertice Pharma UK Parent Limited, Preferred shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.0 [4]   $ 0.0 [4]   $ 0.0 [8]                
Investment, Identifier [Axis]: Viant Medical Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 918.00% [5]   918.00% [5]   8.13% [1] 918.00% [5] 918.00% [5] 918.00% [5] 918.00% [5] 8.13% [1] 8.13% [1] 8.13% [1] 8.13% [1]
Total first lien senior secured loans $ 6.9 [3],[10]   $ 6.9 [3],[10]   $ 3.2 [7],[11]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 6.7 [3],[10]   6.7 [3],[10]   $ 2.8 [7],[11]                
Investment, Identifier [Axis]: Visual Edge Technology, Inc.                          
Investments Activity And Fair Value Table [Abstract]                          
Purchases (cost)     0.0                    
Redemptions (cost)     0.0                    
Sales (cost)     0.0                    
Interest income     1.0                    
Capital structuring service fees     0.0                    
Dividend income     1.0                    
Other income     0.0                    
Net realized gains (losses):     0.0                    
Net unrealized gains (losses):     5.3                    
Fair Value 78.9   78.9                    
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 18.9   18.9                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 18.9   18.9                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 18.9   $ 18.9                    
Investment, Identifier [Axis]: Visual Edge Technology, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon 12.55% [5]   12.55% [5]   11.74% [1] 12.55% [5] 12.55% [5] 12.55% [5] 12.55% [5] 11.74% [1] 11.74% [1] 11.74% [1] 11.74% [1]
Total first lien senior secured loans $ 33.4 [2],[3]   $ 33.4 [2],[3]   $ 32.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 33.4 [2],[3]   33.4 [2],[3]   29.3 [6],[7]                
Investment, Identifier [Axis]: Visual Edge Technology, Inc., Junior preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: Visual Edge Technology, Inc., Senior preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 45.5   45.5                    
Investment, Identifier [Axis]: Visual Edge Technology, Inc., Senior subordinated loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [7],[9]         103.8                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[9]         48.8                
Investment, Identifier [Axis]: Visual Edge Technology, Inc., Warrant to purchase shares of common stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [3]   0.0 [3]   0.0                
Investment, Identifier [Axis]: Vobev, LLC and Vobev Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.4   5.4                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 5.4   5.4                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.4   $ 5.4                    
Investment, Identifier [Axis]: Vobev, LLC and Vobev Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon [5] 13.18%   13.18%     13.18% 13.18% 13.18% 13.18%        
Total first lien senior secured loans [2],[3] $ 50.1   $ 50.1                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 47.6   47.6                    
Investment, Identifier [Axis]: Vobev, LLC and Vobev Holdings, LLC, Warrant to purchase shares of ordinary shares                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 0.0   0.0                    
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 16.3   16.3   35.4                
Less: funded commitments (16.3)   (16.3)   (9.6)                
Total unfunded commitments 0.0   0.0   25.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0   25.8                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.5   $ 4.5   $ 4.4                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 32.8 [2],[3]   $ 32.8 [2],[3]   $ 33.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 31.5 [2],[3]   $ 31.5 [2],[3]   $ 32.4 [6],[7]                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 4.5 [2],[3]   $ 4.5 [2],[3]   $ 14.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.3 [2],[3]   $ 4.3 [2],[3]   $ 14.2 [6],[7]                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 13.8 [2],[3]   $ 13.8 [2],[3]   $ 11.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 13.2 [2],[3]   $ 13.2 [2],[3]   $ 11.0 [6],[7]                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, First lien senior secured loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 10.6 [2],[3]   $ 10.6 [2],[3]   $ 10.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 10.2 [2],[3]   $ 10.2 [2],[3]   $ 10.5 [6],[7]                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, First lien senior secured loan 5                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 4.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 4.4 [6],[7]                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, First lien senior secured loan 6                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, First lien senior secured loan 7                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.98% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.98% [1] 10.98% [1] 10.98% [1] 10.98% [1]
Total first lien senior secured loans $ 30.9 [2],[3]   $ 30.9 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 29.6 [2],[3]   $ 29.6 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: WSHP FC Acquisition LLC and WSHP FC Holdings LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1179.00% [5]   1179.00% [5]   10.32% [1] 1179.00% [5] 1179.00% [5] 1179.00% [5] 1179.00% [5] 10.32% [1] 10.32% [1] 10.32% [1] 10.32% [1]
Total first lien senior secured loans $ 15.3 [2],[3],[13]   $ 15.3 [2],[3],[13]   $ 8.6 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 14.7 [2],[3],[13]   $ 14.7 [2],[3],[13]   $ 8.4 [6],[7],[14]                
Investment, Identifier [Axis]: Walnut Parent, Inc., First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   10.24% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 10.24% [1] 10.24% [1] 10.24% [1] 10.24% [1]
Total first lien senior secured loans $ 14.4 [2],[3]   $ 14.4 [2],[3]   $ 14.7 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 13.9 [2],[3]   $ 13.9 [2],[3]   $ 14.2 [6],[7]                
Investment, Identifier [Axis]: Walnut Parent, Inc., First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1092.00% [5]   1092.00% [5]   10.24% [1] 1092.00% [5] 1092.00% [5] 1092.00% [5] 1092.00% [5] 10.24% [1] 10.24% [1] 10.24% [1] 10.24% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: Wand Newco 3, Inc., Second lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1267.00% [5]   1267.00% [5]   11.63% [1] 1267.00% [5] 1267.00% [5] 1267.00% [5] 1267.00% [5] 11.63% [1] 11.63% [1] 11.63% [1] 11.63% [1]
Total first lien senior secured loans $ 121.7 [3]   $ 121.7 [3]   $ 182.6 [7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 121.7 [3]   $ 121.7 [3]   $ 178.9 [7]                
Investment, Identifier [Axis]: Wash Encore Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1145.00% [5]   1145.00% [5]   9.12% [1] 1145.00% [5] 1145.00% [5] 1145.00% [5] 1145.00% [5] 9.12% [1] 9.12% [1] 9.12% [1] 9.12% [1]
Total first lien senior secured loans $ 97.8 [2],[3]   $ 97.8 [2],[3]   $ 98.5 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 95.8 [2],[3]   95.8 [2],[3]   96.5 [6],[7]                
Investment, Identifier [Axis]: Watermill Express, LLC and Watermill Express Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.7                
Less: funded commitments         0.0                
Total unfunded commitments         0.7                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         0.7                
Investment, Identifier [Axis]: Watermill Express, LLC and Watermill Express Holdings, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.1   $ 4.1   $ 3.2                
Investment, Identifier [Axis]: Watermill Express, LLC and Watermill Express Holdings, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1054.00% [5]   1054.00% [5]   10.23% [1] 1054.00% [5] 1054.00% [5] 1054.00% [5] 1054.00% [5] 10.23% [1] 10.23% [1] 10.23% [1] 10.23% [1]
Total first lien senior secured loans $ 21.0 [2],[3]   $ 21.0 [2],[3]   $ 20.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 21.0 [2],[3]   21.0 [2],[3]   20.4 [6],[7]                
Investment, Identifier [Axis]: Waverly Advisors, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.2                
Less: funded commitments         0.0                
Total unfunded commitments         0.2                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.2                
Investment, Identifier [Axis]: Waverly Advisors, LLC and WAAM Topco, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.2   0.2                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.2   0.2                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 0.2   0.2                    
Investment, Identifier [Axis]: Waverly Advisors, LLC and WAAM Topco, LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [4] $ 1.6   $ 1.6                    
Investment, Identifier [Axis]: Waverly Advisors, LLC and WAAM Topco, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1129.00%   1129.00%     1129.00% 1129.00% 1129.00% 1129.00%        
Total first lien senior secured loans [2],[3],[4] $ 0.6   $ 0.6                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[4] 0.6   0.6                    
Investment, Identifier [Axis]: Waverly Advisors, LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.23%         10.23% 10.23% 10.23% 10.23%
Total first lien senior secured loans [7],[8]         $ 0.6                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [7],[8]         0.6                
Investment, Identifier [Axis]: WebPT, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.9   0.9   0.9                
Less: funded commitments (0.1)   (0.1)   (0.3)                
Total unfunded commitments 0.8   0.8   0.6                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 0.8   $ 0.8   $ 0.6                
Investment, Identifier [Axis]: WebPT, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1227.00% [5]   1227.00% [5]   11.48% [1] 1227.00% [5] 1227.00% [5] 1227.00% [5] 1227.00% [5] 11.48% [1] 11.48% [1] 11.48% [1] 11.48% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 48.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 48.1 [6],[7]                
Investment, Identifier [Axis]: WebPT, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1230.00% [5]   1230.00% [5]   11.26% [1] 1230.00% [5] 1230.00% [5] 1230.00% [5] 1230.00% [5] 11.26% [1] 11.26% [1] 11.26% [1] 11.26% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.3 [6],[7]                
Investment, Identifier [Axis]: Wellness AcquisitionCo, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 3.9   3.9   3.9                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 3.9   3.9   3.9                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.9   $ 3.9   $ 3.9                
Investment, Identifier [Axis]: Wellness AcquisitionCo, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1102.00% [5]   1102.00% [5]   9.91% [1] 1102.00% [5] 1102.00% [5] 1102.00% [5] 1102.00% [5] 9.91% [1] 9.91% [1] 9.91% [1] 9.91% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.1 [2],[3]   0.1 [2],[3]   0.1 [6],[7]                
Investment, Identifier [Axis]: Wellpath Holdings, Inc.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.0   12.0                    
Less: funded commitments (7.5)   (7.5)                    
Total unfunded commitments 4.5   4.5                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 4.5   $ 4.5                    
Investment, Identifier [Axis]: Wellpath Holdings, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1118.00%   1118.00%     1118.00% 1118.00% 1118.00% 1118.00%        
Total first lien senior secured loans [3],[10] $ 33.3   $ 33.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[10] $ 26.8   $ 26.8                    
Investment, Identifier [Axis]: Wellpath Holdings, Inc., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1068.00%   1068.00%     1068.00% 1068.00% 1068.00% 1068.00%        
Total first lien senior secured loans [3],[13] $ 6.2   $ 6.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3],[13] 5.0   5.0                    
Investment, Identifier [Axis]: Wildcat BuyerCo, Inc. and Wildcat Parent, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.1   4.1   4.1                
Less: funded commitments (0.2)   (0.2)   (1.0)                
Total unfunded commitments 3.9   3.9   3.1                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 3.9   $ 3.9   $ 3.1                
Investment, Identifier [Axis]: Wildcat BuyerCo, Inc. and Wildcat Parent, LP, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1054.00% [5]   1054.00% [5]   10.48% [1] 1054.00% [5] 1054.00% [5] 1054.00% [5] 1054.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 17.8 [2],[3]   $ 17.8 [2],[3]   $ 18.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 17.8 [2],[3]   $ 17.8 [2],[3]   $ 17.8 [6],[7]                
Investment, Identifier [Axis]: Wildcat BuyerCo, Inc. and Wildcat Parent, LP, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1054.00% [5]   1054.00% [5]   10.48% [1] 1054.00% [5] 1054.00% [5] 1054.00% [5] 1054.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investment, Identifier [Axis]: Wildcat BuyerCo, Inc. and Wildcat Parent, LP, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1054.00% [5]   1054.00% [5]   10.48% [1] 1054.00% [5] 1054.00% [5] 1054.00% [5] 1054.00% [5] 10.48% [1] 10.48% [1] 10.48% [1] 10.48% [1]
Total first lien senior secured loans $ 0.2 [2],[3]   $ 0.2 [2],[3]   $ 0.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.2 [2],[3]   0.2 [2],[3]   $ 0.2 [6],[7]                
Investment, Identifier [Axis]: Wildcat BuyerCo, Inc. and Wildcat Parent, LP, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         10.09%         10.09% 10.09% 10.09% 10.09%
Total first lien senior secured loans 0.0 [17]   0.0 [17]   $ 0.8 [6],[7],[14]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 0.0 [17]   0.0 [17]   0.8 [6],[7],[14]                
Investment, Identifier [Axis]: Wildcat BuyerCo, Inc. and Wildcat Parent, LP, Limited partnership interests                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 6.4 [3]   $ 6.4 [3]   $ 5.1 [7]                
Investment, Identifier [Axis]: Winebow Holdings, Inc. and The Vintner Group, Inc., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1167.00% [5]   1167.00% [5]   10.63% [1] 1167.00% [5] 1167.00% [5] 1167.00% [5] 1167.00% [5] 10.63% [1] 10.63% [1] 10.63% [1] 10.63% [1]
Total first lien senior secured loans $ 27.8 [2],[3]   $ 27.8 [2],[3]   $ 28.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 27.0 [2],[3]   27.0 [2],[3]   27.5 [6],[7]                
Investment, Identifier [Axis]: WorkWave Intermediate II, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.2   5.2   5.2                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 5.2   5.2   5.2                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 5.2   $ 5.2   5.2                
Investment, Identifier [Axis]: WorkWave Intermediate II, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1199.00%   1199.00%     1199.00% 1199.00% 1199.00% 1199.00%        
Total first lien senior secured loans $ 51.6 [2],[3]   $ 51.6 [2],[3]   67.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 51.6 [2],[3]   $ 51.6 [2],[3]   $ 67.4 [6],[7]                
Investment, Identifier [Axis]: WorkWave Intermediate II, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1199.00% [5]   1199.00% [5]   11.44% [1] 1199.00% [5] 1199.00% [5] 1199.00% [5] 1199.00% [5] 11.44% [1] 11.44% [1] 11.44% [1] 11.44% [1]
Total first lien senior secured loans $ 18.8 [2],[3]   $ 18.8 [2],[3]   $ 17.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 18.8 [2],[3]   18.8 [2],[3]   17.3 [6],[7]                
Investment, Identifier [Axis]: Worldwide Produce Acquisition, LLC and REP WWP Coinvest IV, L.P.                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 4.0   4.0                    
Less: funded commitments (0.7)   (0.7)                    
Total unfunded commitments 3.3   3.3                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 3.3   3.3                    
Investment, Identifier [Axis]: Worldwide Produce Acquisition, LLC and REP WWP Coinvest IV, L.P. 1                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 0.2   0.2                    
Less: funded commitments 0.0   0.0                    
Total unfunded commitments 0.2   0.2                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments 0.2   0.2                    
Investment, Identifier [Axis]: Worldwide Produce Acquisition, LLC and REP WWP Coinvest IV, L.P., Common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 1.9   $ 1.9                    
Investment, Identifier [Axis]: Worldwide Produce Acquisition, LLC and REP WWP Coinvest IV, L.P., First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1164.00%   1164.00%     1164.00% 1164.00% 1164.00% 1164.00%        
Total first lien senior secured loans [2],[3] $ 7.4   $ 7.4                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 7.4   $ 7.4                    
Investment, Identifier [Axis]: Worldwide Produce Acquisition, LLC and REP WWP Coinvest IV, L.P., First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1164.00%   1164.00%     1164.00% 1164.00% 1164.00% 1164.00%        
Total first lien senior secured loans [2],[3],[13] $ 0.5   $ 0.5                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[13] 0.5   0.5                    
Investment, Identifier [Axis]: XIFIN, Inc. and ACP Charger Co-Invest LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 5.6   5.6   8.9                
Less: funded commitments (5.6)   (5.6)   (0.2)                
Total unfunded commitments 0.0   0.0   8.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 0.0   0.0   8.7                
Investment, Identifier [Axis]: XIFIN, Inc. and ACP Charger Co-Invest LLC, Class A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 2.8 [3]   2.8 [3]   4.2 [7]                
Investment, Identifier [Axis]: XIFIN, Inc. and ACP Charger Co-Invest LLC, Class B units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.7 [3]   $ 0.7 [3]   $ 1.1 [7]                
Investment, Identifier [Axis]: XIFIN, Inc. and ACP Charger Co-Invest LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.13% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 37.0 [6]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 36.6 [6]                
Investment, Identifier [Axis]: XIFIN, Inc. and ACP Charger Co-Invest LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1129.00% [5]   1129.00% [5]   10.13% [1] 1129.00% [5] 1129.00% [5] 1129.00% [5] 1129.00% [5] 10.13% [1] 10.13% [1] 10.13% [1] 10.13% [1]
Total first lien senior secured loans $ 36.7 [2],[3]   $ 36.7 [2],[3]   $ 0.1 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 35.2 [2],[3]   $ 35.2 [2],[3]   $ 0.1 [6],[7]                
Investment, Identifier [Axis]: XIFIN, Inc. and ACP Charger Co-Invest LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         12.25%         12.25% 12.25% 12.25% 12.25%
Total first lien senior secured loans [6],[7]         $ 0.2                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.2                
Investment, Identifier [Axis]: XIFIN, Inc. and ACP Charger Co-Invest LLC, First lien senior secured revolving loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1129.00%   1129.00%     1129.00% 1129.00% 1129.00% 1129.00%        
Total first lien senior secured loans [2],[3] $ 4.9   $ 4.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 4.7   $ 4.7                    
Investment, Identifier [Axis]: XIFIN, Inc. and ACP Charger Co-Invest LLC, First lien senior secured revolving loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1325.00%   1325.00%     1325.00% 1325.00% 1325.00% 1325.00%        
Total first lien senior secured loans [2],[3] $ 0.7   $ 0.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 0.6   0.6                    
Investment, Identifier [Axis]: YE Brands Holdings, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 2.3   2.3   2.2                
Less: funded commitments 0.0   0.0   (1.5)                
Total unfunded commitments 2.3   2.3   0.7                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments $ 2.3   $ 2.3   $ 0.7                
Investment, Identifier [Axis]: YE Brands Holdings, LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1099.00% [5]   1099.00% [5]   9.93% [1] 1099.00% [5] 1099.00% [5] 1099.00% [5] 1099.00% [5] 9.93% [1] 9.93% [1] 9.93% [1] 9.93% [1]
Total first lien senior secured loans $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 8.2 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 0.1 [2],[3]   $ 0.1 [2],[3]   $ 8.2 [6],[7],[16]                
Investment, Identifier [Axis]: YE Brands Holdings, LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1124.00% [5]   1124.00% [5]   9.68% [1] 1124.00% [5] 1124.00% [5] 1124.00% [5] 1124.00% [5] 9.68% [1] 9.68% [1] 9.68% [1] 9.68% [1]
Total first lien senior secured loans $ 8.1 [2],[3]   $ 8.1 [2],[3]   $ 0.1 [6],[7],[16]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 8.1 [2],[3]   $ 8.1 [2],[3]   $ 0.1 [6],[7],[16]                
Investment, Identifier [Axis]: YE Brands Holdings, LLC, First lien senior secured loan 3                          
Schedule of Investments [Line Items]                          
Coupon [5] 1118.00%   1118.00%     1118.00% 1118.00% 1118.00% 1118.00%        
Total first lien senior secured loans [2],[3] $ 3.7   $ 3.7                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] 3.7   3.7                    
Investment, Identifier [Axis]: YE Brands Holdings, LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.47%         9.47% 9.47% 9.47% 9.47%
Total first lien senior secured loans [6],[7],[16]         $ 1.5                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7],[16]         1.5                
Investment, Identifier [Axis]: ZB Holdco LLC & ZB Parent LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         21.5                
Less: funded commitments         (0.1)                
Total unfunded commitments         21.4                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 21.4                
Investment, Identifier [Axis]: ZB Holdco LLC & ZB Parent LLC, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [1]         9.48%         9.48% 9.48% 9.48% 9.48%
Total first lien senior secured loans [6],[7]         $ 0.1                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [6],[7]         0.1                
Investment, Identifier [Axis]: ZB Holdco LLC & ZB Parent LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Total first lien senior secured loans [15]         0.0                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [15]         0.0                
Investment, Identifier [Axis]: ZB Holdco LLC & ZB Parent LLC, Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value         5.5                
Investment, Identifier [Axis]: ZB Holdco LLC and ZB TopCo LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 13.1   13.1                    
Less: funded commitments (1.7)   (1.7)                    
Total unfunded commitments 11.4   11.4                    
Less: commitments substantially at discretion of the Company 0.0   0.0                    
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0                    
Total net adjusted unfunded revolving and delayed draw loan commitments $ 11.4   $ 11.4                    
Investment, Identifier [Axis]: ZB Holdco LLC and ZB TopCo LLC, First lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1154.00%   1154.00%     1154.00% 1154.00% 1154.00% 1154.00%        
Total first lien senior secured loans [2],[3] $ 0.2   $ 0.2                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 0.2   $ 0.2                    
Investment, Identifier [Axis]: ZB Holdco LLC and ZB TopCo LLC, First lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1154.00%   1154.00%     1154.00% 1154.00% 1154.00% 1154.00%        
Total first lien senior secured loans [2],[3] $ 3.9   $ 3.9                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3] $ 3.9   $ 3.9                    
Investment, Identifier [Axis]: ZB Holdco LLC and ZB TopCo LLC, First lien senior secured revolving loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate [5] 1155.00%   1155.00%     1155.00% 1155.00% 1155.00% 1155.00%        
Total first lien senior secured loans [2],[3],[13] $ 0.3   $ 0.3                    
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [2],[3],[13] 0.3   0.3                    
Investment, Identifier [Axis]: ZB Holdco LLC and ZB TopCo LLC, Series A units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value [3] 4.6   4.6                    
Investment, Identifier [Axis]: ZBS Mechanical Group Co-Invest Fund 2, LLC, Membership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 11.0   11.0                    
Investment, Identifier [Axis]: ZenDesk, Inc., Zoro TopCo, Inc. and Zoro TopCo, LP                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments 12.8   12.8   16.8                
Less: funded commitments 0.0   0.0   0.0                
Total unfunded commitments 12.8   12.8   16.8                
Less: commitments substantially at discretion of the Company 0.0   0.0   0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions 0.0   0.0   0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments 12.8   12.8   16.8                
Investment, Identifier [Axis]: ZenDesk, Inc., Zoro TopCo, Inc. and Zoro TopCo, LP, Class A common units                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 2.8 [3]   $ 2.8 [3]   $ 2.7 [7]                
Investment, Identifier [Axis]: ZenDesk, Inc., Zoro TopCo, Inc. and Zoro TopCo, LP, First lien senior secured loan                          
Schedule of Investments [Line Items]                          
Coupon | Rate 12.15% [5]   12.15% [5]   11.04% [1] 12.15% [5] 12.15% [5] 12.15% [5] 12.15% [5] 11.04% [1] 11.04% [1] 11.04% [1] 11.04% [1]
Total first lien senior secured loans $ 43.2 [2],[3]   $ 43.2 [2],[3]   $ 42.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 43.2 [2],[3]   43.2 [2],[3]   41.6 [6],[7]                
Investment, Identifier [Axis]: ZenDesk, Inc., Zoro TopCo, Inc. and Zoro TopCo, LP, Series A preferred stock                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 29.7 [3]   $ 29.7 [3]   $ 26.8 [7]                
Investment, Identifier [Axis]: eCapital Finance Corp., Senior subordinated loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1318.00% [5]   1318.00% [5]   11.97% [1] 1318.00% [5] 1318.00% [5] 1318.00% [5] 1318.00% [5] 11.97% [1] 11.97% [1] 11.97% [1] 11.97% [1]
Total first lien senior secured loans $ 56.0 [2],[3]   $ 56.0 [2],[3]   $ 55.8 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 56.0 [2],[3]   $ 56.0 [2],[3]   $ 55.2 [6],[7]                
Investment, Identifier [Axis]: eCapital Finance Corp., Senior subordinated loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1318.00% [5]   1318.00% [5]   11.97% [1] 1318.00% [5] 1318.00% [5] 1318.00% [5] 1318.00% [5] 11.97% [1] 11.97% [1] 11.97% [1] 11.97% [1]
Total first lien senior secured loans $ 5.4 [2],[3]   $ 5.4 [2],[3]   $ 56.0 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 5.4 [2],[3]   $ 5.4 [2],[3]   $ 55.4 [6],[7]                
Investment, Identifier [Axis]: eCapital Finance Corp., Senior subordinated loan 3                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1318.00% [5]   1318.00% [5]   11.97% [1] 1318.00% [5] 1318.00% [5] 1318.00% [5] 1318.00% [5] 11.97% [1] 11.97% [1] 11.97% [1] 11.97% [1]
Total first lien senior secured loans $ 24.3 [2],[3]   $ 24.3 [2],[3]   $ 24.3 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 24.3 [2],[3]   $ 24.3 [2],[3]   $ 24.1 [6],[7]                
Investment, Identifier [Axis]: eCapital Finance Corp., Senior subordinated loan 4                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1318.00% [5]   1318.00% [5]   11.97% [1] 1318.00% [5] 1318.00% [5] 1318.00% [5] 1318.00% [5] 11.97% [1] 11.97% [1] 11.97% [1] 11.97% [1]
Total first lien senior secured loans $ 55.8 [2],[3]   $ 55.8 [2],[3]   $ 5.4 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value 55.8 [2],[3]   55.8 [2],[3]   5.3 [6],[7]                
Investment, Identifier [Axis]: eResearch Technology, Inc. and Astorg VII Co-Invest ERT                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         2.5                
Less: funded commitments         0.0                
Total unfunded commitments         2.5                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         2.5                
Investment, Identifier [Axis]: eResearch Technology, Inc. and Astorg VII Co-Invest ERT, Limited partnership interest                          
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 4.9 [3],[4]   $ 4.9 [3],[4]   $ 3.7 [7],[8]                
Investment, Identifier [Axis]: eResearch Technology, Inc. and Astorg VII Co-Invest ERT, Second lien senior secured loan 1                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1342.00% [5]   1342.00% [5]   12.07% [1] 1342.00% [5] 1342.00% [5] 1342.00% [5] 1342.00% [5] 12.07% [1] 12.07% [1] 12.07% [1] 12.07% [1]
Total first lien senior secured loans $ 17.2 [3]   $ 17.2 [3]   $ 30.6 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 16.8 [3]   $ 16.8 [3]   $ 27.2 [6],[7]                
Investment, Identifier [Axis]: eResearch Technology, Inc. and Astorg VII Co-Invest ERT, Second lien senior secured loan 2                          
Schedule of Investments [Line Items]                          
Coupon | Rate 1342.00% [5]   1342.00% [5]   12.38% [1] 1342.00% [5] 1342.00% [5] 1342.00% [5] 1342.00% [5] 12.38% [1] 12.38% [1] 12.38% [1] 12.38% [1]
Total first lien senior secured loans $ 30.6 [3]   $ 30.6 [3]   $ 17.2 [6],[7]                
Investments Activity And Fair Value Table [Abstract]                          
Fair Value $ 30.0 [3]   $ 30.0 [3]   15.3 [6],[7]                
Investment, Identifier [Axis]: n2y Holding, LLC                          
Financial Support for Nonconsolidated Legal Entity [Abstract]                          
Total revolving and delayed draw loan commitments         0.1                
Less: funded commitments         0.0                
Total unfunded commitments         0.1                
Less: commitments substantially at discretion of the Company         0.0                
Less: unavailable commitments due to borrowing base or other covenant restrictions         0.0                
Total net adjusted unfunded revolving and delayed draw loan commitments         $ 0.1                
[1] Investments without an interest rate are non-income producing.
[2] Loan includes interest rate floor feature.
[3] These assets are pledged as collateral under the Company’s or the Company’s consolidated subsidiaries’ various revolving credit facilities and, as a result, are not directly available to the creditors of the Company to satisfy any obligations of the Company other than the obligations under each of the respective facilities (see Note 5).
[4] This portfolio company is not a qualifying asset under Section 55(a) of the Investment Company Act. Under the Investment Company Act, the Company may not acquire any non-qualifying asset unless, at the time such acquisition is made, qualifying assets represent at least 70% of the Company's total assets. Pursuant to Section 55(a) of the Investment Company Act, 24% of the Company's total assets are represented by investments at fair value and other assets that are considered "non-qualifying assets" as of September 30, 2023.
[5] Investments without an interest rate are non-income producing.
[6] Loan includes interest rate floor feature.
[7] These assets are pledged as collateral under the Company’s or the Company’s consolidated subsidiaries’ various revolving credit facilities and, as a result, are not directly available to the creditors of the Company to satisfy any obligations of the Company other than the obligations under each of the respective facilities (see Note 5).
[8] This portfolio company is not a qualifying asset under Section 55(a) of the Investment Company Act. Under the Investment Company Act, the Company may not acquire any non-qualifying asset unless, at the time such acquisition is made, qualifying assets represent at least 70% of the Company's total assets. Pursuant to Section 55(a) of the Investment Company Act, 25% of the Company's total assets are represented by investments at fair value and other assets that are considered "non-qualifying assets" as of December 31, 2022.
[9] Loan was on non-accrual status as of December 31, 2022.
[10] Other than the investments noted by this footnote, the fair value of the Company’s investments is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 8 to the consolidated financial statements for more information regarding the fair value of the Company’s investments.
[11] Other than the investments noted by this footnote, the fair value of the Company’s investments is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 8 to the consolidated financial statements for more information regarding the fair value of the Company’s investments.
[12] Loan was on non-accrual status as of September 30, 2023.
[13] As of September 30, 2023, in addition to the amounts funded by the Company under this first lien senior secured revolving loan, there were also letters of credit issued and outstanding through a financial intermediary under the loan. See Note 7 for further information on letters of credit commitments related to certain portfolio companies.
[14] As of December 31, 2022, in addition to the amounts funded by the Company under this first lien senior secured revolving loan, there were also letters of credit issued and outstanding through a financial intermediary under the loan. See Note 7 for further information on letters of credit commitments related to certain portfolio companies.
[15] As of December 31, 2022, no amounts were funded by the Company under this first lien senior secured revolving loan; however, there were letters of credit issued and outstanding through a financial intermediary under the loan. See Note 7 for further information on letters of credit commitments related to certain portfolio companies.
[16] As of December 31, 2022, the Company had the following commitments to fund various revolving and delayed draw senior secured and subordinated loans, including commitments to issue letters of credit through a financial intermediary on behalf of certain portfolio companies. Such commitments are subject to the satisfaction of certain conditions set forth in the documents governing these loans and letters of credit and there can be no assurance that such conditions will be satisfied. See Note 7 for further information on revolving and delayed draw loan commitments, including commitments to issue letters of credit, related to certain portfolio companies.
(in millions)
Portfolio Company
Total revolving and delayed draw loan commitmentsLess: funded commitmentsTotal unfunded commitmentsLess: commitments substantially at discretion of the CompanyLess: unavailable commitments due to borrowing base or other covenant restrictionsTotal net adjusted unfunded revolving and delayed draw commitments
Absolute Dental Group LLC and Absolute Dental Equity, LLC$7.1 $(3.2)$3.9 $— $— $3.9 
Abzena Holdings, Inc. and Astro Group Holdings Ltd.0.1 — 0.1 — — 0.1 
Accommodations Plus Technologies LLC and Accommodations Plus Technologies Holdings LLC4.1 (4.1)— — — — 
ADG, LLC and RC IV GEDC Investor LLC14.1 (14.1)— — — — 
Advarra Holdings, Inc.0.4 — 0.4 — — 0.4 
AffiniPay Midco, LLC and AffiniPay Intermediate Holdings, LLC45.6 — 45.6 — — 45.6 
AI Fire Buyer, Inc. and AI Fire Parent LLC28.9 (0.4)28.5 — — 28.5 
AIM Acquisition, LLC1.8 — 1.8 — — 1.8 
Alcami Corporation and ACM Note Holdings, LLC6.6 — 6.6 — — 6.6 
American Residential Services L.L.C. and Aragorn Parent Holdings LP4.5 (0.9)3.6 — — 3.6 
Anaplan, Inc.1.4 — 1.4 — — 1.4 
Anaqua Parent Holdings, Inc. & Astorg VII Co-Invest Anaqua3.4 — 3.4 — — 3.4 
APG Intermediate Holdings Corporation and APG Holdings, LLC0.1 — 0.1 — — 0.1 
Applied Technical Services, LLC3.8 (1.1)2.7 — — 2.7 
Appriss Health, LLC and Appriss Health Intermediate Holdings, Inc.0.1 — 0.1 — — 0.1 
Apptio, Inc.4.2 (2.5)1.7 — — 1.7 
AQ Sage Buyer, LLC6.4 — 6.4 — — 6.4 
AQ Sunshine, Inc.12.4 (1.4)11.0 — — 11.0 
Argenbright Holdings V, LLC and Amberstone Security Group Limited2.5 — 2.5 — — 2.5 
ASP-r-pac Acquisition CO LLC and ASP-r-pac Holdings LP6.2 — 6.2 — — 6.2 
AthenaHealth Group Inc., Minerva Holdco, Inc. and BCPE Co-Invest (A), LP9.0 — 9.0 — — 9.0 
ATI Restoration, LLC83.7 (5.8)77.9 — — 77.9 
Atlas Intermediate III, L.L.C.0.8 (0.2)0.6 — — 0.6 
Avalara, Inc.2.7 — 2.7 — — 2.7 
Aventine Intermediate LLC & Aventine Holdings II LLC0.2 — 0.2 — — 0.2 
Avetta, LLC4.2 — 4.2 — — 4.2 
AxiomSL Group, Inc. and Calypso Group, Inc.3.9 — 3.9 — — 3.9 
BAART Programs, Inc., MedMark Services, Inc., and Canadian Addiction Treatment Centres LP2.0 — 2.0 — — 2.0 
Banyan Software Holdings, LLC and Banyan Software, LP8.0 (0.9)7.1 — — 7.1 
Beacon Pointe Harmony, LLC5.5 — 5.5 — — 5.5 
Belfor Holdings, Inc.25.0 (17.0)8.0 — — 8.0 
Benecon Midco II LLC and Locutus Holdco LLC4.5 — 4.5 — — 4.5 
Benefytt Technologies, Inc.0.9 — 0.9 — — 0.9 
Berner Food & Beverage, LLC1.7 (0.5)1.2 — — 1.2 
BlueHalo Financing Holdings, LLC, BlueHalo Global Holdings, LLC, and BlueHalo, LLC3.0 (2.8)0.2 — — 0.2 
Borrower R365 Holdings LLC2.9 — 2.9 — — 2.9 
Bottomline Technologies, Inc.2.3 — 2.3 — — 2.3 
Bragg Live Food Products, LLC and SPC Investment Co., L.P.4.4 — 4.4 — — 4.4 
Businessolver.com, Inc.3.6 — 3.6 — — 3.6 
Cadence Aerospace, LLC15.3 (14.8)0.5 — — 0.5 
Caerus Midco 3 S.à r.l.4.1 — 4.1 — — 4.1 
Capstone Acquisition Holdings, Inc. and Capstone Parent Holdings, LP15.3 (8.8)6.5 — — 6.5 
Captive Resources Midco, LLC1.2 — 1.2 — — 1.2 
Cardinal Parent, Inc. and Packers Software Intermediate Holdings, Inc.5.0 (3.4)1.6 — — 1.6 
CCS-CMGC Holdings, Inc.12.0 (3.7)8.3 — — 8.3 
CDI Holdings III Corp. and CDI Holdings I Corp.0.9 — 0.9 — — 0.9 
Center for Autism and Related Disorders, LLC20.4 (9.0)11.4 — (11.4)— 
Centric Brands LLC and Centric Brands GP LLC8.6 (5.0)3.6 — — 3.6 
Chariot Buyer LLC12.3 (3.5)8.8 — — 8.8 
Cheyenne Petroleum Company Limited Partnership, CPC 2001 LLC and Mill Shoals LLC9.5 — 9.5 — — 9.5 
CMG HoldCo, LLC and CMG Buyer Holdings, Inc.10.2 (0.4)9.8 — — 9.8 
Cobalt Buyer Sub, Inc., Cobalt Holdings I, LP, and Cobalt Intermediate I, Inc.7.8 (2.5)5.3 — — 5.3 
(in millions)
Portfolio Company
Total revolving and delayed draw loan commitmentsLess: funded commitmentsTotal unfunded commitmentsLess: commitments substantially at discretion of the CompanyLess: unavailable commitments due to borrowing base or other covenant restrictionsTotal net adjusted unfunded revolving and delayed draw commitments
Commercial Trailer Leasing, Inc.0.6 — 0.6 — — 0.6 
Community Brands ParentCo, LLC7.2 — 7.2 — — 7.2 
Compex Legal Services, Inc.3.6 (1.8)1.8 — — 1.8 
Comprehensive EyeCare Partners, LLC1.9 (0.8)1.1 — — 1.1 
Concert Golf Partners Holdco LLC3.1 — 3.1 — — 3.1 
Consilio Midco Limited, Compusoft US LLC, and Consilio Investment Holdings, L.P.14.2 (0.8)13.4 — — 13.4 
Continental Café, LLC and Infinity Ovation Yacht Charters, LLC8.0 (0.7)7.3 — — 7.3 
Convera International Holdings Limited and Convera International Financial S.A R.L.2.3 — 2.3 — — 2.3 
CoreLogic, Inc. and T-VIII Celestial Co-Invest LP38.9 — 38.9 — — 38.9 
Cority Software Inc., Cority Software (USA) Inc., and Cority Parent, Inc.0.1 — 0.1 — — 0.1 
Cornerstone OnDemand, Inc. and Sunshine Software Holdings, Inc.38.7 (22.7)16.0 — — 16.0 
Covaris Intermediate 3, LLC & Covaris Parent, LLC22.2 (1.5)20.7 — — 20.7 
Coyote Buyer, LLC5.8 — 5.8 — — 5.8 
CrossCountry Mortgage, LLC56.3 — 56.3 — — 56.3 
Crown CT Parent Inc., Crown CT HoldCo Inc. and Crown CT Management LLC3.2 — 3.2 — — 3.2 
CST Holding Company1.9 (0.2)1.7 — — 1.7 
CVP Holdco, Inc. and OMERS Wildcats Investment Holdings LLC25.8 — 25.8 — — 25.8 
DecoPac, Inc. and KCAKE Holdings Inc.16.5 (6.6)9.9 — — 9.9 
Denali Holdco LLC and Denali Apexco LP11.4 — 11.4 — — 11.4 
DFC Global Facility Borrower III LLC96.7 (79.3)17.4 — — 17.4 
Diligent Corporation and Diligent Preferred Issuer, Inc.2.2 (0.7)1.5 — — 1.5 
Display Holding Company, Inc., Saldon Holdings, Inc. and Fastsigns Holdings Inc.2.3 — 2.3 — — 2.3 
DRS Holdings III, Inc. and DRS Holdings I, Inc.10.8 — 10.8 — — 10.8 
DS Admiral Bidco, LLC0.1 — 0.1 — — 0.1 
Dye & Durham Corporation18.2 (5.0)13.2 — — 13.2 
Dynamic NC Aerospace Holdings, LLC and Dynamic NC Investment Holdings, LP7.1 — 7.1 — — 7.1 
Elemica Parent, Inc. & EZ Elemica Holdings, Inc.4.1 (4.1)— — — — 
Elevation Services Parent Holdings, LLC17.1 (1.5)15.6 — — 15.6 
Emergency Communications Network, LLC6.8 (6.8)— — — — 
EP Wealth Advisors, LLC14.1 — 14.1 — — 14.1 
EpiServer Inc. and Episerver Sweden Holdings AB14.5 — 14.5 — — 14.5 
EPS NASS Parent, Inc.1.5 (0.8)0.7 — — 0.7 
eResearch Technology, Inc. and Astorg VII Co-Invest ERT2.5 — 2.5 — — 2.5 
ESHA Research, LLC and RMCF VI CIV XLVIII, L.P.1.1 — 1.1 — — 1.1 
Essential Services Holding Corporation and OMERS Mahomes Investment Holdings LLC28.0 (6.2)21.8 — — 21.8 
Explorer Investor, Inc0.2 — 0.2 — — 0.2 
Extrahop Networks, Inc.5.9 — 5.9 — — 5.9 
Faraday Buyer, LLC4.7 — 4.7 — — 4.7 
FL Hawk Intermediate Holdings, Inc.0.5 — 0.5 — — 0.5 
Flinn Scientific, Inc. and WCI-Quantum Holdings, Inc.14.5 (7.1)7.4 — — 7.4 
FM:Systems Group, LLC1.5 — 1.5 — — 1.5 
Forescout Technologies, Inc.14.2 — 14.2 — — 14.2 
Foundation Risk Partners, Corp.40.5 (8.6)31.9 — — 31.9 
FS Squared Holding Corp. and FS Squared, LLC9.6 (0.5)9.1 — — 9.1 
Galway Borrower LLC9.8 (0.4)9.4 — — 9.4 
Genesis Acquisition Co. and Genesis Ultimate Holding Co.1.5 (1.5)— — — — 
GHX Ultimate Parent Corporation, Commerce Parent, Inc. and Commerce Topco, LLC47.5 — 47.5 — — 47.5 
GI Ranger Intermediate LLC9.2 (0.4)8.8 — — 8.8 
Global Music Rights, LLC4.3 — 4.3 — — 4.3 
GNZ Energy Bidco Limited and Galileo Co-investment Trust I3.1 — 3.1 — — 3.1 
Gotham Greens Holdings, PBC33.8 — 33.8 — — 33.8 
GraphPAD Software, LLC, Insightful Science Intermediate I, LLC and Insightful Science Holdings, LLC5.0 — 5.0 — — 5.0 
(in millions)
Portfolio Company
Total revolving and delayed draw loan commitmentsLess: funded commitmentsTotal unfunded commitmentsLess: commitments substantially at discretion of the CompanyLess: unavailable commitments due to borrowing base or other covenant restrictionsTotal net adjusted unfunded revolving and delayed draw commitments
HAI Acquisition Corporation and Aloha Topco, LLC19.0 — 19.0 — — 19.0 
Harvey Tool Company, LLC28.5 — 28.5 — — 28.5 
HealthEdge Software, Inc.36.2 (0.3)35.9 — — 35.9 
Heavy Construction Systems Specialists, LLC4.0 — 4.0 — — 4.0 
Help/Systems Holdings, Inc.7.5 — 7.5 — — 7.5 
HGC Holdings, LLC7.5 — 7.5 — — 7.5 
HH-Stella, Inc. and Bedrock Parent Holdings, LP14.8 (2.8)12.0 — — 12.0 
High Street Buyer, Inc. and High Street Holdco LLC25.5 — 25.5 — — 25.5 
Highline Aftermarket Acquisition, LLC, Highline Aftermarket SC Acquisition, Inc. and Highline PPC Blocker LLC9.5 (1.1)8.4 — — 8.4 
Hometown Food Company3.9 (0.8)3.1 — — 3.1 
Huskies Parent, Inc., GI Insurity Parent LLC and GI Insurity TopCo LP22.6 (9.4)13.2 — — 13.2 
Infinity Home Services HoldCo, Inc. and IHS Parent Holdings, L.P.13.0 — 13.0 — — 13.0 
Inszone Mid, LLC and INSZ Holdings, LLC17.2 — 17.2 — — 17.2 
IQN Holding Corp.6.8 — 6.8 — — 6.8 
ISQ Hawkeye Holdco, Inc. and ISQ Hawkeye Holdings, LLC9.8 (0.2)9.6 — — 9.6 
ITI Holdings, Inc.5.7 (2.0)3.7 — — 3.7 
JDC Healthcare Management, LLC4.8 (4.8)— — — — 
K2 Insurance Services, LLC and K2 Holdco LP9.1 — 9.1 — — 9.1 
Kaseya Inc. and Knockout Intermediate Holdings I Inc.31.2 — 31.2 — — 31.2 
KBHS Acquisition, LLC (d/b/a Alita Care, LLC)5.0 (3.2)1.8 — — 1.8 
Kene Acquisition, Inc. and Kene Holdings, L.P.8.9 (0.2)8.7 — — 8.7 
Laboratories Bidco LLC and Laboratories Topco LLC41.3 (8.8)32.5 — — 32.5 
LeanTaaS Holdings, Inc.54.0 — 54.0 — — 54.0 
Leviathan Intermediate Holdco, LLC and Leviathan Holdings, L.P.5.5 (0.7)4.8 — — 4.8 
Lew's Intermediate Holdings, LLC2.3 — 2.3 — — 2.3 
Lido Advisors, LLC0.8 (0.4)0.4 — — 0.4 
LJ Perimeter Buyer, Inc. and LJ Perimeter Co-Invest, L.P.10.1 — 10.1 — — 10.1 
LJP Purchaser, Inc. and LJP Topco, LP4.4 — 4.4 — — 4.4 
Lower ACS, Inc.25.9 — 25.9 — — 25.9 
LSP Holdco, LLC and ZBS Mechanical Group Co-Invest Fund 2, LLC3.9 — 3.9 — — 3.9 
Majesco and Magic Topco, L.P.2.0 — 2.0 — — 2.0 
Management Consulting & Research LLC4.0 — 4.0 — — 4.0 
Manna Pro Products, LLC7.0 (5.1)1.9 — — 1.9 
Marmic Purchaser, LLC and Marmic Topco, L.P.6.9 — 6.9 — — 6.9 
Mavis Tire Express Services Topco Corp., Metis Holdco, Inc. and Metis Topco, LP32.9 (7.3)25.6 — — 25.6 
McKenzie Creative Brands, LLC4.5 (1.9)2.6 — — 2.6 
Medline Borrower, LP6.9 (0.2)6.7 — — 6.7 
Micromeritics Instrument Corp.4.1 — 4.1 — — 4.1 
Mimecast Borrowerco, Inc. and Magnesium Co- Invest SCSp15.1 — 15.1 — — 15.1 
Ministry Brands Holdings, LLC and RCP MB Investments B, L.P.31.3 (4.0)27.3 — — 27.3 
Monica Holdco (US) Inc.3.6 (2.4)1.2 — — 1.2 
Moonraker AcquisitionCo LLC and Moonraker HoldCo LLC19.0 — 19.0 — — 19.0 
MRI Software LLC10.6 — 10.6 — — 10.6 
Murchison Oil and Gas, LLC and Murchison Holdings, LLC27.5 — 27.5 — — 27.5 
n2y Holding, LLC0.1 — 0.1 — — 0.1 
NAS, LLC and Nationwide Marketing Group, LLC3.0 (0.6)2.4 — — 2.4 
National Intergovernmental Purchasing Alliance Company9.0 (1.2)7.8 — — 7.8 
NCWS Intermediate, Inc. and NCWS Holdings LP28.1 — 28.1 — — 28.1 
Nelipak Holding Company, Nelipak European Holdings Cooperatief U.A., KNPAK Holdings, LP and PAKNK Netherlands Treasury B.V.0.6 (0.1)0.5 — — 0.5 
Neptune Bidco US Inc. and Elliott Metron Co-Investor Aggregator L.P.12.6 — 12.6 — — 12.6 
Nest Topco Borrower Inc., KKR Nest Co-Invest L.P., and NBLY 2021-1119.1 — 119.1 — — 119.1 
NMC Skincare Intermediate Holdings II, LLC12.7 — 12.7 — — 12.7 
NMN Holdings III Corp. and NMN Holdings LP12.5 (3.1)9.4 — — 9.4 
Noble Aerospace, LLC5.6 (2.2)3.4 — — 3.4 
North American Fire Holdings, LLC and North American Fire Ultimate Holdings, LLC8.1 — 8.1 — — 8.1 
(in millions)
Portfolio Company
Total revolving and delayed draw loan commitmentsLess: funded commitmentsTotal unfunded commitmentsLess: commitments substantially at discretion of the CompanyLess: unavailable commitments due to borrowing base or other covenant restrictionsTotal net adjusted unfunded revolving and delayed draw commitments
North Haven Fairway Buyer, LLC, Fairway Lawns, LLC and Command Pest Control, LLC22.5 — 22.5 — — 22.5 
North Haven Falcon Buyer, LLC and North Haven Falcon Holding Company, LLC3.5 — 3.5 — — 3.5 
North Haven Stack Buyer, LLC5.1 (0.8)4.3 — — 4.3 
Offen, Inc.5.6 — 5.6 — — 5.6 
Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC1.6 — 1.6 — (1.6)— 
OneDigital Borrower LLC7.5 (0.4)7.1 — — 7.1 
Pathway Vet Alliance LLC and Jedi Group Holdings LLC1.9 — 1.9 — — 1.9 
Patriot Growth Insurance Services, LLC2.2 — 2.2 — — 2.2 
Paya, Inc and GTCR-Ultra Holdings LLC4.5 — 4.5 — — 4.5 
PDDS HoldCo, Inc.2.1 — 2.1 — — 2.1 
PDI TA Holdings, Inc., Peachtree Parent, Inc. and Insight PDI Holdings, LLC7.6 (6.1)1.5 — — 1.5 
Pegasus Global Enterprise Holdings, LLC, Mekone Blocker Acquisition, Inc. and Mekone Parent, LLC20.6 — 20.6 — — 20.6 
Pelican Products, Inc.2.3 — 2.3 — — 2.3 
People Corporation20.6 (1.3)19.3 — — 19.3 
Perforce Software, Inc.0.5 — 0.5 — — 0.5 
Petroleum Service Group LLC17.5 (4.4)13.1 — — 13.1 
Petrus Buyer, Inc.2.7 — 2.7 — — 2.7 
Petvisor Holdings, LLC37.6 — 37.6 — — 37.6 
Ping Identity Holding Corp.0.2 — 0.2 — — 0.2 
Pluralsight, Inc.0.3 (0.2)0.1 — — 0.1 
Precision Concepts International LLC and Precision Concepts Canada Corporation19.2 (6.2)13.0 — — 13.0 
Premier Specialties, Inc. and RMCF V CIV XLIV, L.P.11.0 (2.3)8.7 — — 8.7 
Premise Health Holding Corp. and OMERS Bluejay Investment Holdings LP36.0 (0.6)35.4 — — 35.4 
Prime Buyer, L.L.C.15.9 (2.7)13.2 — — 13.2 
Pritchard Industries, LLC and LJ Pritchard TopCo Holdings, LLC3.3 — 3.3 — — 3.3 
Professional Fighters League, LLC and PFL MMA, Inc.0.1 — 0.1 — — 0.1 
ProfitSolv Purchaser, Inc. and PS Co-Invest, L.P.13.3 — 13.3 — — 13.3 
Project Essential Bidco, Inc. and Project Essential Super Parent, Inc.1.1 — 1.1 — — 1.1 
Project Potter Buyer, LLC and Project Potter Parent, L.P.5.5 (2.1)3.4 — — 3.4 
Proofpoint, Inc.3.1 — 3.1 — — 3.1 
PS Operating Company LLC and PS Op Holdings LLC5.9 (4.5)1.4 — — 1.4 
Pueblo Mechanical and Controls, LLC and OMERS PMC Investment Holdings LLC3.6 — 3.6 — — 3.6 
Pyramid Management Advisors, LLC and Pyramid Investors, LLC9.8 (9.8)— — — — 
QF Holdings, Inc.2.3 — 2.3 — — 2.3 
Qnnect, LLC and Connector TopCo, LP2.8 — 2.8 — — 2.8 
Radius Aerospace, Inc. and Radius Aerospace Europe Limited2.8 (0.7)2.1 — — 2.1 
Radwell Parent, LLC4.4 — 4.4 — — 4.4 
Raptor Technologies, LLC, Sycamore Bidco LTD and Rocket Parent, LLC4.4 — 4.4 — — 4.4 
RB Holdings InterCo, LLC5.6 (1.8)3.8 — — 3.8 
Reddy Ice LLC0.2 — 0.2 — — 0.2 
Redwood Services, LLC and Redwood Services Holdco, LLC4.5 — 4.5 — — 4.5 
Reef Lifestyle, LLC37.7 (37.7)— — — — 
Registrar Intermediate, LLC and PSP Registrar Co-Investment Fund, L.P.28.0 — 28.0 — — 28.0 
Relativity ODA LLC3.8 — 3.8 — — 3.8 
Repairify, Inc. and Repairify Holdings, LLC7.3 — 7.3 — — 7.3 
Revalize, Inc.0.9 — 0.9 — — 0.9 
Rialto Management Group, LLC1.3 (0.2)1.1 — — 1.1 
Riser Merger Sub, Inc.2.8 — 2.8 — — 2.8 
Riverview Power LLC8.9 — 8.9 — — 8.9 
RMS HoldCo II, LLC & RMS Group Holdings, Inc.2.9 — 2.9 — — 2.9 
Rodeo AcquisitionCo LLC6.2 (1.3)4.9 — — 4.9 
(in millions)
Portfolio Company
Total revolving and delayed draw loan commitmentsLess: funded commitmentsTotal unfunded commitmentsLess: commitments substantially at discretion of the CompanyLess: unavailable commitments due to borrowing base or other covenant restrictionsTotal net adjusted unfunded revolving and delayed draw commitments
RSC Acquisition, Inc. and RSC Insurance Brokerage, Inc.0.6 — 0.6 — — 0.6 
RTI Surgical, Inc. and Pioneer Surgical Technology, Inc.15.9 (9.8)6.1 — — 6.1 
SageSure Holdings, LLC & Insight Catastrophe Group, LLC10.5 (5.9)4.6 — — 4.6 
Schill Landscaping and Lawn Care Services LLC, Tender Lawn Care ULC and Landscape Parallel Partners, L.P.4.6 (0.2)4.4 — — 4.4 
SCIH Salt Holdings Inc.7.5 (2.6)4.9 — — 4.9 
SCM Insurance Services Inc.4.0 — 4.0 — — 4.0 
SFE Intermediate Holdco LLC15.2 (8.3)6.9 — — 6.9 
Shermco Intermediate Holdings, Inc.4.0 (2.7)1.3 — — 1.3 
Shock Doctor, Inc. and Shock Doctor Holdings, LLC2.5 — 2.5 — — 2.5 
Shur-Co Acquisition, Inc. and Shur-Co Holdco, Inc.5.0 (1.8)3.2 — — 3.2 
SiroMed Physician Services, Inc. and SiroMed Equity Holdings, LLC7.1 — 7.1 — — 7.1 
SM Wellness Holdings, Inc. and SM Holdco, Inc.3.8 — 3.8 — — 3.8 
Smarsh Inc. and Skywalker TopCo, LLC2.0 — 2.0 — — 2.0 
Spirit RR Holdings, Inc. and Winterfell Co-Invest SCSp1.7 — 1.7 — — 1.7 
Star US Bidco LLC8.5 — 8.5 — — 8.5 
Sun Acquirer Corp. and Sun TopCo, LP21.6 (0.4)21.2 — — 21.2 
Sundance Group Holdings, Inc.3.0 — 3.0 — — 3.0 
Sunk Rock Foundry Partners LP, Hatteras Electrical Manufacturing Holding Company and Sigma Electric Manufacturing Corporation, Diecast Beacon6.0 (0.6)5.4 — — 5.4 
Sunrun Luna Holdco 2021, LLC75.0 (40.7)34.3 — — 34.3 
SV-Burton Holdings, LLC and LBC Breeze Holdings LLC3.3 — 3.3 — — 3.3 
Symplr Software Inc. and Symplr Software Intermediate Holdings, Inc.7.0 (3.1)3.9 — — 3.9 
Synergy HomeCare Franchising, LLC and NP/Synergy Holdings, LLC4.2 — 4.2 — — 4.2 
TA/WEG Holdings, LLC2.0 — 2.0 — — 2.0 
Tamarack Intermediate, L.L.C. and Tamarack Parent, L.L.C.7.5 (1.3)6.2 — — 6.2 
Taymax Group, L.P., Taymax Group G.P., LLC, PF Salem Canada ULC and TCP Fit Parent, L.P.1.7 (0.8)0.9 — — 0.9 
TCP Hawker Intermediate LLC0.3 (0.1)0.2 — — 0.2 
TerSera Therapeutics LLC0.1 — 0.1 — — 0.1 
The Alaska Club Partners, LLC, Athletic Club Partners LLC and The Alaska Club, Inc.1.1 — 1.1 — — 1.1 
The Arcticom Group, LLC and AMCP Mechanical Holdings, LP12.6 (11.5)1.1 — — 1.1 
The Mather Group, LLC, TVG-TMG Topco, Inc., and TVG-TMG Holdings, LLC1.7 (0.1)1.6 — — 1.6 
The NPD Group, L.P., IRI Group Holdings, Inc., Information Resources, Inc. and IRI-NPD Co-Invest Aggregator, L.P.14.4 (1.8)12.6 — — 12.6 
The Ultimus Group Midco, LLC, The Ultimus Group, LLC, and The Ultimus Group Aggregator, LP6.9 — 6.9 — — 6.9 
Thermostat Purchaser III, Inc.11.7 — 11.7 — — 11.7 
THG Acquisition, LLC18.2 — 18.2 — — 18.2 
TibCo Software Inc., Picard Parent, Inc., Picard MidCo, Inc., Picard HoldCo, LLC and Elliott Alto Co-Investor Aggregator L.P.19.0 — 19.0 — — 19.0 
Trader Corporation and Project Auto Finco Corp.3.6 — 3.6 — — 3.6 
Two Six Labs, LLC10.3 — 10.3 — — 10.3 
UKG Inc. and H&F Unite Partners, L.P.25.0 (10.8)14.2 — — 14.2 
United Digestive MSO Parent, LLC18.4 — 18.4 — — 18.4 
US Salt Investors, LLC and Emerald Lake Pearl Acquisition-A, L.P.9.9 — 9.9 — — 9.9 
Verista, Inc.8.2 (1.1)7.1 — — 7.1 
Verscend Holding Corp.22.5 — 22.5 — — 22.5 
VPP Intermediate Holdings, LLC and VPP Group Holdings, L.P.8.7 — 8.7 — — 8.7 
VRC Companies, LLC5.4 — 5.4 — — 5.4 
VS Buyer, LLC8.1 — 8.1 — — 8.1 
Watermill Express, LLC and Watermill Express Holdings, LLC0.7 — 0.7 — — 0.7 
Waverly Advisors, LLC0.2 — 0.2 — — 0.2 
WebPT, Inc.0.9 (0.3)0.6 — — 0.6 
Wellness AcquisitionCo, Inc.3.9 — 3.9 — — 3.9 
Wildcat BuyerCo, Inc. and Wildcat Parent, LP4.1 (1.0)3.1 — — 3.1 
WorkWave Intermediate II, LLC5.2 — 5.2 — — 5.2 
WSHP FC Acquisition LLC and WSHP FC Holdings LLC35.4 (9.6)25.8 — — 25.8 
(in millions)
Portfolio Company
Total revolving and delayed draw loan commitmentsLess: funded commitmentsTotal unfunded commitmentsLess: commitments substantially at discretion of the CompanyLess: unavailable commitments due to borrowing base or other covenant restrictionsTotal net adjusted unfunded revolving and delayed draw commitments
XIFIN, Inc. and ACP Charger Co-Invest LLC8.9 (0.2)8.7 — — 8.7 
YE Brands Holdings, LLC2.2 (1.5)0.7 — — 0.7 
ZB Holdco LLC & ZB Parent LLC21.5 (0.1)21.4 — — 21.4 
ZenDesk, Inc., Zoro TopCo, Inc. and Zoro TopCo, LP16.8 — 16.8 — — 16.8 
$2,915.8 $(526.2)$2,389.6 $— $(13.0)$2,376.6 
[17] As of September 30, 2023, no amounts were funded by the Company under this first lien senior secured revolving loan; however, there were letters of credit issued and outstanding through a financial intermediary under the loan. See Note 7 for further information on letters of credit commitments related to certain portfolio companies.
[18] The Company sold a participating interest of approximately $34.2 in aggregate principal amount outstanding of the portfolio company’s first lien senior secured revolving loan. As the transaction did not qualify as a “true sale” in accordance with U.S. generally accepted accounting principles (“GAAP”), the Company recorded a corresponding $34.2 secured borrowing, at fair value, included in “secured borrowings” in the accompanying consolidated balance sheet. As of September 30, 2023, the interest rate in effect for the secured borrowing was 12.93%.
[19] The Company sold a participating interest of approximately $79.0 in aggregate principal amount outstanding of the portfolio company’s first lien senior secured revolving loan. As the transaction did not qualify as a “true sale” in accordance with GAAP, the Company recorded a corresponding $79.0 secured borrowing, at fair value, included in “secured borrowings” in the accompanying consolidated balance sheet. As of December 31, 2022, the interest rate in effect for the secured borrowing was 11.62%.
[20] In addition to the interest earned based on the stated interest rate of this security, the Company is entitled to receive an additional interest amount of 2.00% on $40.5 in aggregate principal amount of a “first out” tranche of the portfolio company’s senior term debt previously syndicated by the Company into “first out” and “last out” tranches, whereby the “first out” tranche will have priority as to the “last out” tranche with respect to payments of principal, interest and any other amounts due thereunder.
[21] In addition to the interest earned based on the stated interest rate of this security, the Company is entitled to receive an additional interest amount of 2.00% on $40.9 in aggregate principal amount of a “first out” tranche of the portfolio company’s senior term debt previously syndicated by the Company into “first out” and “last out” tranches, whereby the “first out” tranche will have priority as to the “last out” tranche with respect to payments of principal, interest and any other amounts due thereunder.
[22] As defined in the Investment Company Act, the Company is deemed to be both an “Affiliated Person” and “Control” this portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the year ended December 31, 2022 in which the issuer was both an Affiliated Person and a portfolio company that the Company is deemed to Control are as follows:
For the Year Ended December 31, 2022As of December 31, 2022
(in millions)
Company
Purchases (cost)Redemptions (cost)Sales (cost)Interest incomeCapital
structuring service fees
Dividend incomeOther incomeNet realized gains (losses)Net 
unrealized gains (losses)
Fair Value
Absolute Dental Group LLC and Absolute Dental Equity, LLC$2.0 $3.0 $— $6.0 $— $— $— $— $4.6 $70.2 
ACAS Equity Holdings Corporation— — — — — — — — — 0.4 
ADF Capital, Inc., ADF Restaurant Group, LLC, and ARG Restaurant Holdings, Inc.— — — — — — — — — — 
CoLTs 2005-1 Ltd.— — — — — — — — — — 
Eckler Industries, Inc. and Eckler Purchaser LLC8.8 57.0 — — — — — (57.0)25.1 — 
Halex Holdings, Inc.— — — — — — — — — — 
HCI Equity, LLC— — — — — — — — — — 
Heelstone Renewable Energy, LLC and Heelstone Renewable Energy Investors, LLC95.4 — — 7.1 1.9 — — — 42.6 209.6 
Imaging Business Machines, L.L.C. and Scanner Holdings Corporation— 3.9 — 2.4 0.7 23.1 0.5 — (5.4)47.8 
Ivy Hill Asset Management, L.P.1,544.2 277.6 — 22.5 — 205.0 — — (1.0)2,201.1 
Joyce Lane Capital LLC and Joyce Lane Financing SPV LLC (fka Ciena Capital LLC)— 0.3 — 0.1 — — — 0.5 0.1 — 
Navisun LLC and Navisun Holdings LLC— 131.0 — 0.4 — 0.1 — 19.0 (9.4)— 
Olympia Acquisition, Inc., Olympia TopCo, L.P., and Asclepius Holdings LLC8.3 — — 3.2 0.3 — — — (11.7)44.7 
Potomac Intermediate Holdings II LLC6.0 — — — — — — — (42.4)143.2 
PS Operating Company LLC and PS Op Holdings LLC6.3 4.6 — 1.5 — — — — 1.0 27.7 
RD Holdco Inc.— 0.1 — — — — — — (10.6)10.3 
S Toys Holdings LLC (fka The Step2 Company, LLC)— — — — — — — — (0.1)— 
Senior Direct Lending Program, LLC317.8 31.1 — 146.3 16.9 — 5.5 — (25.3)1,248.6 
Startec Equity, LLC— — — — — — — — — — 
VPROP Operating, LLC and V SandCo, LLC6.0 4.5 — 5.0 0.2 — — — 33.5 116.1 
$1,994.8 $513.1 $— $194.5 $20.0 $228.2 $6.0 $(37.5)$1.0 $4,119.7 
______________________________________________________________________

*    Together with Varagon and its clients, the Company has co-invested through the SDLP. The SDLP has been capitalized as transactions are completed and all portfolio decisions and generally all other decisions in respect of the SDLP must be approved by an investment committee of the SDLP consisting of representatives of the Company and Varagon (with approval from a representative of each required); therefore, although the Company owns more than 25% of the voting securities of the SDLP, the Company does not believe that it has control over the SDLP (for purposes of the Investment Company Act or otherwise) because, among other things, these “voting securities” do not afford the Company the right to elect directors of the SDLP or any other special rights (see Note 4 to the consolidated financial statements).
[23] In addition to the interest earned based on the stated contractual interest rate of this security, the certificates entitle the holders thereof to receive a portion of the excess cash flow from the SDLP’s loan portfolio, after expenses, which may result in a return to the Company greater than the contractual stated interest rate.
[24] In addition to the interest earned based on the stated contractual interest rate of this security, the certificates entitle the holders thereof to receive a portion of the excess cash flow from the SDLP’s loan portfolio, after expenses, which may result in a return to the Company greater than the contractual stated interest rate.
[25] As defined in the Investment Company Act, the Company is deemed to be an “Affiliated Person” because it owns 5% or more of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the year ended December 31, 2022 in which the issuer was an Affiliated Person of the Company (but not a portfolio company that the Company is deemed to Control) are as follows:
For the Year Ended December 31, 2022As of December 31, 2022
(in millions)
Company
Purchases (cost)Redemptions (cost)Sales (cost)Interest incomeCapital
structuring service fees
Dividend incomeOther incomeNet realized gains (losses)Net 
unrealized gains (losses)
Fair Value
Apex Clean Energy TopCo, LLC$18.1 $— $— $— $— $— $— $— $53.4 $150.6 
APG Intermediate Holdings Corporation and APG Holdings, LLC— 0.1 — 1.0 — — — — (3.0)21.8 
Blue Wolf Capital Fund II, L.P.— — — — — — — — (0.2)0.1 
Bragg Live Food Products, LLC and SPC Investment Co., L.P.3.3 5.7 9.8 3.4 — — 0.2 (0.2)3.5 39.1 
ESCP PPG Holdings, LLC2.3 — — — — — — — (1.9)3.1 
European Capital UK SME Debt LP— 0.8 — — — 2.0 — — 0.4 26.5 
PCG-Ares Sidecar Investment, L.P.— — — — — — — — (0.6)0.7 
PCG-Ares Sidecar Investment II, L.P.0.1 — — — — — — — 4.2 15.5 
Primrose Holding Corporation— — 4.6 — — — — 28.9 (22.4)— 
Production Resource Group, L.L.C. and PRG III, LLC2.5 0.3 — 7.0 0.1 — — — 33.6 97.3 
Shock Doctor, Inc. and Shock Doctor Holdings, LLC3.2 4.5 18.9 0.8 — — 0.1 — 3.0 6.0 
Sundance Energy Inc.— 41.0 — — — — — (22.6)1.2 — 
Totes Isotoner Corporation and Totes Ultimate Holdco, Inc.— — — 0.3 — — — — (0.2)3.7 
$29.5 $52.4 $33.3 $12.5 $0.1 $2.0 $0.3 $6.1 $71.0 $364.4