v3.25.2
Portfolio Investments - Schedule of Portfolio Listing (Details)
€ in Thousands, ¥ in Thousands, £ in Thousands, $ in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
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Sep. 30, 2024
USD ($)
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Jun. 30, 2025
EUR (€)
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Jun. 30, 2025
GBP (£)
shares
Jun. 30, 2025
CAD ($)
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Jun. 30, 2025
JPY (¥)
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Sep. 30, 2024
EUR (€)
shares
Sep. 30, 2024
GBP (£)
shares
Jun. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, at cost $ 3,012,589 $ 3,144,919                
Investments at fair value $ 2,809,377 $ 3,021,279                
Debt instrument, basis spread, variable rate (as a percent) 0.10%                  
Minimum                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, floor interest rate (as a percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%    
Maximum                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, floor interest rate (as a percent) 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%    
SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal $ 339,147 $ 330,094                
Investment owned, at cost 348,377 337,882                
Investments at fair value $ 332,977 $ 329,496                
SLF JV I | 30-Day SOFR                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, basis spread, variable rate (as a percent) 4.32% 4.85%                
SLF JV I | 90-Day SOFR                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, basis spread, variable rate (as a percent) 4.29% 4.59%                
SLF JV I | 180-Day SOFR                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, basis spread, variable rate (as a percent) 4.15%                  
SLF JV I | Minimum                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, floor interest rate (as a percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%    
SLF JV I | Maximum                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, floor interest rate (as a percent) 3.00% 2.00% 3.00% 3.00% 3.00% 3.00% 2.00% 2.00%    
Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal $ 111,423 $ 125,405                
Investment owned, at cost 114,441 127,867                
Investments at fair value $ 109,333 $ 124,887                
Glick JV LLC | 30-Day SOFR                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, basis spread, variable rate (as a percent)   4.85%                
Glick JV LLC | 90-Day SOFR                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, basis spread, variable rate (as a percent)   4.59%                
Glick JV LLC | Minimum                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, floor interest rate (as a percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%    
Glick JV LLC | Maximum                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Debt instrument, floor interest rate (as a percent) 3.00% 2.00% 3.00% 3.00% 3.00% 3.00% 2.00% 2.00%    
Investment, Identifier [Axis]: 107 Fair Street LLC, Real Estate Development, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [1],[2],[3],[4]   13.00%         13.00% 13.00%    
Investment, principal [1],[2],[4],[5]   $ 1,989                
Investment owned, at cost [1],[2],[4]   1,985                
Investments at fair value [1],[2],[4]   $ 1,934                
Investment, Identifier [Axis]: 107-109 Beech OAK22 LLC, Real Estate Development, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 11.00% [6],[7],[8] 11.00% [1],[2],[3] 11.00% [6],[7],[8] 11.00% [6],[7],[8] 11.00% [6],[7],[8] 11.00% [6],[7],[8] 11.00% [1],[2],[3] 11.00% [1],[2],[3]    
Investment, principal $ 16,173 [6],[7],[9] $ 31,231 [1],[2],[5]                
Investment owned, at cost 16,006 [6],[7] 30,920 [1],[2]                
Investments at fair value $ 16,098 [6],[7] $ 31,015 [1],[2]                
Investment, Identifier [Axis]: 112-126 Van Houten Real22 LLC, Real Estate Development, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [1],[2],[3],[4]   13.00%         13.00% 13.00%    
Investment, principal [1],[2],[4],[5]   $ 5,336                
Investment owned, at cost [1],[2],[4]   5,332                
Investments at fair value [1],[2],[4]   $ 5,288                
Investment, Identifier [Axis]: 1261229 BC LTD, Pharmaceuticals, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [10],[11] 6.25%   6.25% 6.25% 6.25% 6.25%        
Investment, interest rate (as a percent) [8],[10],[11] 10.56%   10.56% 10.56% 10.56% 10.56%        
Investment, principal [9],[10],[11] $ 19,600                  
Investment owned, at cost [10],[11] 19,130                  
Investments at fair value [10],[11] $ 18,946                  
Investment, Identifier [Axis]: 1261229 BC LTD, Pharmaceuticals, Fixed Rate Bond                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [8],[10] 10.00%   10.00% 10.00% 10.00% 10.00%        
Investment, principal [9],[10] $ 9,100                  
Investment owned, at cost [10] 9,100                  
Investments at fair value [10] $ 9,186                  
Investment, Identifier [Axis]: 1440 Foods Topco, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) 9.33%   9.33% 9.33% 9.33% 9.33%        
Investment, principal $ 8,206                  
Investment owned, at cost 7,891                  
Investments at fair value $ 7,928                  
Investment, Identifier [Axis]: A.T. Holdings II Ltd., Biotechnology, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 5.97% [6],[8],[10],[12] 14.25% [2],[3],[13],[14] 5.97% [6],[8],[10],[12] 5.97% [6],[8],[10],[12] 5.97% [6],[8],[10],[12] 5.97% [6],[8],[10],[12] 14.25% [2],[3],[13],[14] 14.25% [2],[3],[13],[14]    
Investment, interest rate, paid in kind (as a percent) [6],[10],[12] 8.28%   8.28% 8.28% 8.28% 8.28%        
Investment, principal $ 23,083 [6],[9],[10],[12] $ 21,870 [2],[5],[13],[14]                
Investment owned, at cost 22,365 [6],[10],[12] 21,024 [2],[13],[14]                
Investments at fair value $ 22,621 [6],[10],[12] $ 21,979 [2],[13],[14]                
Investment, Identifier [Axis]: A.T. Holdings II SÀRL, Biotechnology, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 22.50% [6],[10],[15] 22.50% [2],[13],[16] 22.50% [6],[10],[15] 22.50% [6],[10],[15] 22.50% [6],[10],[15] 22.50% [6],[10],[15] 22.50% [2],[13],[16] 22.50% [2],[13],[16]    
Investment, principal $ 7,152 [6],[9],[10],[15] $ 7,835 [2],[5],[13],[16]                
Investment owned, at cost 5,400 [6],[10],[15] 7,028 [2],[13],[16]                
Investments at fair value $ 7,116 [6],[10],[15] $ 7,796 [2],[13],[16]                
Investment, Identifier [Axis]: ACESO Holding 4 S.A.R.L., Health Care Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[10],[11] 5.75% [1],[2],[13],[17] 5.75% [6],[10],[11] 5.75% [6],[10],[11] 5.75% [6],[10],[11] 5.75% [6],[10],[11] 5.75% [1],[2],[13],[17] 5.75% [1],[2],[13],[17]    
Investment, interest rate (as a percent) [6],[8],[10],[11] 7.74%   7.74% 7.74% 7.74% 7.74%        
Investment, principal   $ 0 [1],[2],[5],[13],[17] € 4,204 [6],[9],[10],[11]              
Investment owned, at cost $ 4,838 [6],[10],[11] (47) [1],[2],[13],[17]                
Investments at fair value $ 4,871 [6],[10],[11] $ (47) [1],[2],[13],[17]                
Investment, Identifier [Axis]: ACESO Holding 4 S.A.R.L., Health Care Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[10],[11] 5.75% [2],[13],[17] 5.75% [6],[10],[11] 5.75% [6],[10],[11] 5.75% [6],[10],[11] 5.75% [6],[10],[11] 5.75% [2],[13],[17] 5.75% [2],[13],[17]    
Investment, interest rate (as a percent) 8.13% [6],[8],[10],[11] 8.91% [2],[3],[13],[17] 8.13% [6],[8],[10],[11] 8.13% [6],[8],[10],[11] 8.13% [6],[8],[10],[11] 8.13% [6],[8],[10],[11] 8.91% [2],[3],[13],[17] 8.91% [2],[3],[13],[17]    
Investment, principal $ 16,817 [6],[9],[10],[11]           € 16,817 [2],[5],[13],[17]      
Investment owned, at cost 18,435 [6],[10],[11] $ 18,424 [2],[13],[17]                
Investments at fair value $ 19,484 [6],[10],[11] $ 18,393 [2],[13],[17]                
Investment, Identifier [Axis]: ACESO Holding 4 S.A.R.L., Health Care Services, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 5.75%   5.75% 5.75% 5.75% 5.75%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 7.74%   7.74% 7.74% 7.74% 7.74%        
Investment, principal [6],[9],[10],[11] $ 12,405                  
Investment owned, at cost [6],[10],[11] 14,246                  
Investments at fair value [6],[10],[11] $ 14,372                  
Investment, Identifier [Axis]: ADB Companies, LLC, Construction & Engineering, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% [6],[11] 6.50% [2],[17] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 6.50% [2],[17] 6.50% [2],[17]    
Investment, interest rate (as a percent) 11.06% [6],[8],[11] 11.37% [2],[3],[17] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 11.37% [2],[3],[17] 11.37% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) [6],[11] 1.00%   1.00% 1.00% 1.00% 1.00%        
Investment, principal $ 2,807 [6],[9],[11] $ 3,079 [2],[5],[17]                
Investment owned, at cost 2,801 [6],[11] 3,062 [2],[17]                
Investments at fair value $ 2,708 [6],[11] $ 2,955 [2],[17]                
Investment, Identifier [Axis]: ADB Companies, LLC, Construction & Engineering, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% [6],[11] 6.50% [2],[17] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 6.50% [2],[17] 6.50% [2],[17]    
Investment, interest rate (as a percent) 11.06% [6],[8],[11] 12.01% [2],[3],[17] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 12.01% [2],[3],[17] 12.01% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) [6],[11] 1.00%   1.00% 1.00% 1.00% 1.00%        
Investment, principal $ 803 [6],[9],[11] $ 875 [2],[5],[17]                
Investment owned, at cost 800 [6],[11] 868 [2],[17]                
Investments at fair value $ 775 [6],[11] $ 840 [2],[17]                
Investment, Identifier [Axis]: ADB Companies, LLC, Construction & Engineering, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% [6],[11] 6.50% [2],[17] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 6.50% [2],[17] 6.50% [2],[17]    
Investment, interest rate (as a percent) 11.06% [6],[8],[11] 11.37% [2],[3],[17] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 11.06% [6],[8],[11] 11.37% [2],[3],[17] 11.37% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) [6],[11] 1.00%   1.00% 1.00% 1.00% 1.00%        
Investment, principal $ 14,676 [6],[9],[11] $ 16,053 [2],[5],[17]                
Investment owned, at cost 14,649 [6],[11] 15,975 [2],[17]                
Investments at fair value $ 14,162 [6],[11] $ 15,410 [2],[17]                
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% 6.50% 7.50% 7.50% 7.50% 7.50% 6.50% 6.50%    
Investment, interest rate (as a percent) 11.06% 11.37% 11.06% 11.06% 11.06% 11.06% 11.37% 11.37%    
Investment, interest rate, paid in kind (as a percent) 1.00%   1.00% 1.00% 1.00% 1.00%        
Investment, principal $ 936 $ 1,026                
Investment owned, at cost 933 1,019                
Investments at fair value $ 903 $ 985                
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% 6.50% 7.50% 7.50% 7.50% 7.50% 6.50% 6.50%    
Investment, interest rate (as a percent) 11.06% 11.37% 11.06% 11.06% 11.06% 11.06% 11.37% 11.37%    
Investment, interest rate, paid in kind (as a percent) 1.00%   1.00% 1.00% 1.00% 1.00%        
Investment, principal $ 3,071 $ 3,359                
Investment owned, at cost 3,058 3,341                
Investments at fair value $ 2,964 $ 3,225                
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% 6.50% 7.50% 7.50% 7.50% 7.50% 6.50% 6.50%    
Investment, interest rate (as a percent) 11.06% 11.37% 11.06% 11.06% 11.06% 11.06% 11.37% 11.37%    
Investment, interest rate, paid in kind (as a percent) 1.00%   1.00% 1.00% 1.00% 1.00%        
Investment, principal $ 5,551 $ 6,072                
Investment owned, at cost 5,531 6,038                
Investments at fair value $ 5,357 $ 5,829                
Investment, Identifier [Axis]: ADB Companies, LLC, First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% 6.50% 7.50% 7.50% 7.50% 7.50% 6.50% 6.50%    
Investment, interest rate (as a percent) 11.06% 11.37% 11.06% 11.06% 11.06% 11.06% 11.37% 11.37%    
Investment, interest rate, paid in kind (as a percent) 1.00%   1.00% 1.00% 1.00% 1.00%        
Investment, principal $ 468 $ 513                
Investment owned, at cost 467 510                
Investments at fair value $ 451 $ 493                
Investment, Identifier [Axis]: ADC Therapeutics SA, Biotechnology, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 1,674,030 [10] 1,674,030 [13] 1,674,030 [10] 1,674,030 [10] 1,674,030 [10] 1,674,030 [10] 1,674,030 [13] 1,674,030 [13]    
Investment owned, at cost $ 0 [10] $ 0 [13]                
Investments at fair value $ 0 [10] $ 0 [13]                
Investment, Identifier [Axis]: ADC Therapeutics SA, Biotechnology, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% [6],[10],[11] 7.50% [2],[13],[17] 7.50% [6],[10],[11] 7.50% [6],[10],[11] 7.50% [6],[10],[11] 7.50% [6],[10],[11] 7.50% [2],[13],[17] 7.50% [2],[13],[17]    
Investment, interest rate (as a percent) 11.95% [6],[8],[10],[11] 12.25% [2],[3],[13],[17] 11.95% [6],[8],[10],[11] 11.95% [6],[8],[10],[11] 11.95% [6],[8],[10],[11] 11.95% [6],[8],[10],[11] 12.25% [2],[3],[13],[17] 12.25% [2],[3],[13],[17]    
Investment, principal $ 6,589 [6],[9],[10],[11] $ 6,589 [2],[5],[13],[17]                
Investment owned, at cost 6,389 [6],[10],[11] 6,353 [2],[13],[17]                
Investments at fair value $ 6,490 [6],[10],[11] $ 6,424 [2],[13],[17]                
Investment, Identifier [Axis]: ADC Therapeutics SA, Biotechnology, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 28,948 [6],[10] 28,948 [2],[13] 28,948 [6],[10] 28,948 [6],[10] 28,948 [6],[10] 28,948 [6],[10] 28,948 [2],[13] 28,948 [2],[13]    
Investment owned, at cost $ 174 [6],[10] $ 174 [2],[13]                
Investments at fair value $ 19 [6],[10] $ 33 [2],[13]                
Investment, Identifier [Axis]: AIP RD Buyer Corp., Distributors, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 17,870 [6] 17,870 [2] 17,870 [6] 17,870 [6] 17,870 [6] 17,870 [6] 17,870 [2] 17,870 [2]    
Investment owned, at cost $ 1,733 [6] $ 1,733 [2]                
Investments at fair value $ 2,837 [6] $ 2,220 [2]                
Investment, Identifier [Axis]: ASP Integrity Acquisition Co LLC, Diversified Support Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) [6],[7],[8],[11] 11.50%   11.50% 11.50% 11.50% 11.50%        
Investment, principal [6],[7],[9],[11] $ 126                  
Investment owned, at cost [6],[7],[11] 86                  
Investments at fair value [6],[7],[11] $ 37                  
Investment, Identifier [Axis]: ASP Integrity Acquisition Co LLC, Diversified Support Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[11] 9.32%   9.32% 9.32% 9.32% 9.32%        
Investment, principal [6],[9],[11] $ 15,086                  
Investment owned, at cost [6],[11] 14,870                  
Investments at fair value [6],[11] $ 14,612                  
Investment, Identifier [Axis]: ASP Integrity Acquisition Co LLC, Diversified Support Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (18)                  
Investments at fair value [6],[7],[11] $ (79)                  
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC , First Lien Revolver | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent)   11.29%         11.29% 11.29%    
Investment, principal   $ 290                
Investment owned, at cost   284                
Investments at fair value   $ 266                
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Revolver | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, interest rate (as a percent) 10.44%   10.44% 10.44% 10.44% 10.44%        
Investment, principal $ 285                  
Investment owned, at cost 281                  
Investments at fair value $ 277                  
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Revolver | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, interest rate (as a percent) 10.44%   10.44% 10.44% 10.44% 10.44%        
Investment, principal $ 118                  
Investment owned, at cost 117                  
Investments at fair value $ 115                  
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment, interest rate (as a percent) 10.54% 11.52% 10.54% 10.54% 10.54% 10.54% 11.52% 11.52%    
Investment, principal $ 4,061 $ 4,092                
Investment owned, at cost 4,027 4,048                
Investments at fair value $ 3,996 $ 3,896                
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, interest rate (as a percent) 10.54%   10.54% 10.54% 10.54% 10.54%        
Investment, principal $ 1,686                  
Investment owned, at cost 1,672                  
Investments at fair value $ 1,659                  
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent)   11.52%         11.52% 11.52%    
Investment, principal   $ 1,699                
Investment owned, at cost   1,681                
Investments at fair value   $ 1,617                
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent)   11.29%         11.29% 11.29%    
Investment, principal   $ 120                
Investment owned, at cost   118                
Investments at fair value   $ 110                
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, Paper & Plastic Packaging Products & Materials, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[7],[10],[11] 6.00% [1],[2],[13],[17] 6.00% [6],[7],[10],[11] 6.00% [6],[7],[10],[11] 6.00% [6],[7],[10],[11] 6.00% [6],[7],[10],[11] 6.00% [1],[2],[13],[17] 6.00% [1],[2],[13],[17]    
Investment, interest rate (as a percent) 10.44% [6],[7],[8],[10],[11] 11.29% [1],[2],[3],[13],[17] 10.44% [6],[7],[8],[10],[11] 10.44% [6],[7],[8],[10],[11] 10.44% [6],[7],[8],[10],[11] 10.44% [6],[7],[8],[10],[11] 11.29% [1],[2],[3],[13],[17] 11.29% [1],[2],[3],[13],[17]    
Investment, principal $ 226 [6],[7],[9],[10],[11] $ 230 [1],[2],[5],[13],[17]                
Investment owned, at cost 218 [6],[7],[10],[11] 220 [1],[2],[13],[17]                
Investments at fair value $ 219 [6],[7],[10],[11] $ 211 [1],[2],[13],[17]                
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, Paper & Plastic Packaging Products & Materials, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[13],[17]   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent) [2],[3],[13],[17]   10.66%         10.66% 10.66%    
Investment, principal [2],[5],[13],[17]   $ 3,243                
Investment owned, at cost [2],[13],[17]   3,234                
Investments at fair value [2],[13],[17]   $ 3,087                
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, Paper & Plastic Packaging Products & Materials, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 10.54%   10.54% 10.54% 10.54% 10.54%        
Investment, principal [6],[9],[10],[11] $ 3,218                  
Investment owned, at cost [6],[10],[11] 3,214                  
Investments at fair value [6],[10],[11] $ 3,166                  
Investment, Identifier [Axis]: ASP-R-PAC Acquisition Co LLC, Paper & Plastic Packaging Products & Materials, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 10.28%   10.28% 10.28% 10.28% 10.28%        
Investment, principal [6],[9],[10],[11] $ 667                  
Investment owned, at cost [6],[10],[11] 662                  
Investments at fair value [6],[10],[11] 657                  
Investment, Identifier [Axis]: ATNX SPV, LLC, Pharmaceuticals, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) [2],[13],[14]   15.89%         15.89% 15.89%    
Investment, principal 13,768 [6],[9],[10],[12] $ 12,989 [2],[5],[13],[14]                
Investment owned, at cost 13,783 [6],[10],[12] 13,013 [2],[13],[14]                
Investments at fair value $ 13,631 [6],[10],[12] $ 12,892 [2],[13],[14]                
Investment, Identifier [Axis]: AVSC Holding Corp., Specialized Consumer Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (107)                  
Investments at fair value [6],[7],[11] $ (108)                  
Investment, Identifier [Axis]: AVSC Holding Corp., Specialized Consumer Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[11] 9.33%   9.33% 9.33% 9.33% 9.33%        
Investment, principal [6],[9],[11] $ 56,067                  
Investment owned, at cost [6],[11] 55,037                  
Investments at fair value [6],[11] $ 55,030                  
Investment, Identifier [Axis]: Access CIG, LLC, Diversified Support Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [17]   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent) [3],[17]   10.25%         10.25% 10.25%    
Investment, principal [5],[17]   $ 1,985                
Investment owned, at cost [17]   1,975                
Investments at fair value [17]   $ 1,996                
Investment, Identifier [Axis]: Access CIG, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25% 5.00% 4.25% 4.25% 4.25% 4.25% 5.00% 5.00%    
Investment, interest rate (as a percent) 8.38% 10.25% 8.38% 8.38% 8.38% 8.38% 10.25% 10.25%    
Investment, principal $ 10,416 $ 10,495                
Investment owned, at cost 10,346 10,404                
Investments at fair value $ 10,477 $ 10,553                
Investment, Identifier [Axis]: Access CIG, LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.38%   8.38% 8.38% 8.38% 8.38%        
Investment, principal $ 1,965                  
Investment owned, at cost 1,940                  
Investments at fair value $ 1,977                  
Investment, Identifier [Axis]: Access CIG, LLC,First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent)   10.25%         10.25% 10.25%    
Investment, principal   $ 1,980                
Investment owned, at cost   1,948                
Investments at fair value   $ 1,991                
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., Insurance Brokers, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% [6],[7],[11] 4.75% [1],[2],[17] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [1],[2],[17] 4.75% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (5) [6],[7],[11] (5) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ (5) [1],[2],[17]                
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., Insurance Brokers, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   4.75%         4.75% 4.75%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   (48)                
Investments at fair value [1],[2],[17]   $ (45)                
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., Insurance Brokers, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, interest rate (as a percent) [6],[7],[8],[11] 9.05%   9.05% 9.05% 9.05% 9.05%        
Investment, principal [6],[7],[9],[11] $ 587                  
Investment owned, at cost [6],[7],[11] 563                  
Investments at fair value [6],[7],[11] $ 587                  
Investment, Identifier [Axis]: Accession Risk Management Group, Inc., Insurance Brokers, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, interest rate (as a percent) [6],[8],[11] 9.05%   9.05% 9.05% 9.05% 9.05%        
Investment, principal [6],[9],[11] $ 4,133                  
Investment owned, at cost [6],[11] 4,133                  
Investments at fair value [6],[11] $ 4,133                  
Investment, Identifier [Axis]: Accupac, Inc., Personal Care Products, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent) [1],[2],[3],[17]   10.90%         10.90% 10.90%    
Investment, principal [1],[2],[5],[17]   $ 2,482                
Investment owned, at cost [1],[2],[17]   2,471                
Investments at fair value [1],[2],[17]   $ 2,443                
Investment, Identifier [Axis]: Accupac, Inc., Personal Care Products, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   6.00%         6.00% 6.00%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   (2)                
Investments at fair value [1],[2],[17]   $ (59)                
Investment, Identifier [Axis]: Accupac, Inc., Personal Care Products, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent) [2],[3],[17]   10.90%         10.90% 10.90%    
Investment, principal [2],[5],[17]   $ 20,024                
Investment owned, at cost [2],[17]   19,978                
Investments at fair value [2],[17]   $ 19,724                
Investment, Identifier [Axis]: Acquia Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[11] 7.00% [1],[2],[17] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [1],[2],[17] 7.00% [1],[2],[17]    
Investment, interest rate (as a percent) 11.43% [6],[8],[11] 12.47% [1],[2],[3],[17] 11.43% [6],[8],[11] 11.43% [6],[8],[11] 11.43% [6],[8],[11] 11.43% [6],[8],[11] 12.47% [1],[2],[3],[17] 12.47% [1],[2],[3],[17]    
Investment, principal $ 2,709 [6],[9],[11] $ 1,084 [1],[2],[5],[17]                
Investment owned, at cost 2,703 [6],[11] 1,078 [1],[2],[17]                
Investments at fair value $ 2,709 [6],[11] $ 1,084 [1],[2],[17]                
Investment, Identifier [Axis]: Acquia Inc., Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[11] 7.00% [2],[17] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [2],[17] 7.00% [2],[17]    
Investment, interest rate (as a percent) 11.41% [6],[8],[11] 12.46% [2],[3],[17] 11.41% [6],[8],[11] 11.41% [6],[8],[11] 11.41% [6],[8],[11] 11.41% [6],[8],[11] 12.46% [2],[3],[17] 12.46% [2],[3],[17]    
Investment, principal $ 6,400 [6],[9],[11] $ 6,400 [2],[5],[17]                
Investment owned, at cost 6,389 [6],[11] 6,366 [2],[17]                
Investments at fair value $ 6,400 [6],[11] $ 6,400 [2],[17]                
Investment, Identifier [Axis]: Acquia Inc., Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[11] 7.00% [2],[17] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [2],[17] 7.00% [2],[17]    
Investment, interest rate (as a percent) 11.41% [6],[8],[11] 12.46% [2],[3],[17] 11.41% [6],[8],[11] 11.41% [6],[8],[11] 11.41% [6],[8],[11] 11.41% [6],[8],[11] 12.46% [2],[3],[17] 12.46% [2],[3],[17]    
Investment, principal $ 25,332 [6],[9],[11] $ 25,332 [2],[5],[17]                
Investment owned, at cost 25,300 [6],[11] 25,309 [2],[17]                
Investments at fair value $ 25,332 [6],[11] $ 25,332 [2],[17]                
Investment, Identifier [Axis]: AirStrip Technologies, Inc., Application Software, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [2]   5,715         5,715 5,715    
Investment owned, at cost [2]   $ 90                
Investments at fair value [2]   $ 0                
Investment, Identifier [Axis]: All Web Leads, Inc., Advertising, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 11,499 [6] 11,499 [2] 11,499 [6] 11,499 [6] 11,499 [6] 11,499 [6] 11,499 [2] 11,499 [2] 11,499  
Investment, principal $ 0               $ 0  
Investment owned, at cost 1,622 [6] $ 1,622 [2]                
Investments at fair value $ 1,622 [6] $ 1,622 [2]             $ 1,622 $ 0
Investment, Identifier [Axis]: All Web Leads, Inc., Advertising, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% [6],[7],[11] 4.00% [1],[2],[17] 4.00% [6],[7],[11] 4.00% [6],[7],[11] 4.00% [6],[7],[11] 4.00% [6],[7],[11] 4.00% [1],[2],[17] 4.00% [1],[2],[17] 4.00%  
Investment, interest rate (as a percent) 8.40% [6],[7],[8],[11] 8.70% [1],[2],[3],[17] 8.40% [6],[7],[8],[11] 8.40% [6],[7],[8],[11] 8.40% [6],[7],[8],[11] 8.40% [6],[7],[8],[11] 8.70% [1],[2],[3],[17] 8.70% [1],[2],[3],[17] 9.34%  
Investment, principal $ 1,440 [6],[7],[9],[11] $ 1,560 [1],[2],[5],[17]             $ 1,560  
Investment owned, at cost 1,420 [6],[7],[11] 1,520 [1],[2],[17]                
Investments at fair value $ 1,386 [6],[7],[11] $ 1,506 [1],[2],[17]             $ 1,506 0
Investment, Identifier [Axis]: All Web Leads, Inc., Advertising, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% [6],[11] 4.00% [2],[17] 4.00% [6],[11] 4.00% [6],[11] 4.00% [6],[11] 4.00% [6],[11] 4.00% [2],[17] 4.00% [2],[17] 4.00%  
Investment, interest rate (as a percent) 6.40% [6],[8],[11] 6.70% [2],[3],[17] 6.40% [6],[8],[11] 6.40% [6],[8],[11] 6.40% [6],[8],[11] 6.40% [6],[8],[11] 6.70% [2],[3],[17] 6.70% [2],[3],[17] 7.34%  
Investment, interest rate, paid in kind (as a percent) 2.00% [6],[11] 2.00% [2],[17] 2.00% [6],[11] 2.00% [6],[11] 2.00% [6],[11] 2.00% [6],[11] 2.00% [2],[17] 2.00% [2],[17] 2.00%  
Investment, principal $ 1,811 [6],[9],[11] $ 1,819 [2],[5],[17]             $ 1,809  
Investment owned, at cost 1,773 [6],[11] 1,757 [2],[17]                
Investments at fair value $ 1,733 [6],[11] $ 1,741 [2],[17]             $ 1,731 0
Investment, Identifier [Axis]: All Web Leads, Inc., Advertising, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[11] 5.00% [2],[17] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [2],[17] 5.00% [2],[17] 5.00%  
Investment, interest rate (as a percent) 7.40% [6],[8],[11] 7.70% [2],[3],[17] 7.40% [6],[8],[11] 7.40% [6],[8],[11] 7.40% [6],[8],[11] 7.40% [6],[8],[11] 7.70% [2],[3],[17] 7.70% [2],[3],[17] 8.34%  
Investment, interest rate, paid in kind (as a percent) 2.00% [6],[11] 2.00% [2],[17] 2.00% [6],[11] 2.00% [6],[11] 2.00% [6],[11] 2.00% [6],[11] 2.00% [2],[17] 2.00% [2],[17] 2.00%  
Investment, principal $ 3,693 [6],[9],[11] $ 3,637 [2],[5],[17]             $ 3,602  
Investment owned, at cost 3,592 [6],[11] 3,493 [2],[17]                
Investments at fair value $ 3,515 [6],[11] $ 3,463 [2],[17]             $ 3,429 0
Investment, Identifier [Axis]: All Web Leads, Inc., Advertising, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[15] 10.00% [2],[16] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [2],[16] 10.00% [2],[16] 10.00%  
Investment, principal $ 3,816 [6],[9],[15] $ 3,541 [2],[5],[16]             $ 3,451  
Investment owned, at cost 3,027 [6],[15] 3,026 [2],[16]                
Investments at fair value $ 3,264 [6],[15] $ 3,183 [2],[16]             $ 3,102 0
Investment, Identifier [Axis]: Alto Pharmacy Holdings, Inc., Health Care Technology, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   11.50%         11.50% 11.50%    
Investment, interest rate (as a percent) [2],[3],[17]   8.00%         8.00% 8.00%    
Investment, interest rate, paid in kind (as a percent) [2],[17]   8.93%         8.93% 8.93%    
Investment, principal [2],[5],[17]   $ 10,134                
Investment owned, at cost [2],[17]   9,666                
Investments at fair value [2],[17]   $ 9,120                
Investment, Identifier [Axis]: Alto Pharmacy Holdings, Inc., Health Care Technology, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [2]   598,283         598,283 598,283    
Investment owned, at cost [2]   $ 642                
Investments at fair value [2]   $ 802                
Investment, Identifier [Axis]: Alvogen Pharma US, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   7.50%         7.50% 7.50%    
Investment, interest rate (as a percent)   12.45%         12.45% 12.45%    
Investment, principal   $ 8,329                
Investment owned, at cost   8,304                
Investments at fair value   $ 7,663                
Investment, Identifier [Axis]: Alvogen Pharma US, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   7.50%         7.50% 7.50%    
Investment, interest rate (as a percent)   12.45%         12.45% 12.45%    
Investment, principal   $ 5,897                
Investment owned, at cost   5,880                
Investments at fair value   $ 5,426                
Investment, Identifier [Axis]: Alvogen Pharma US, Inc., Pharmaceuticals, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   7.50%         7.50% 7.50%    
Investment, interest rate (as a percent) [2],[3],[17]   12.45%         12.45% 12.45%    
Investment, principal [2],[5],[17]   $ 16,143                
Investment owned, at cost [2],[17]   16,115                
Investments at fair value [2],[17]   $ 14,852                
Investment, Identifier [Axis]: Alvogen Pharma US, Inc., Pharmaceuticals, Second Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 10.50%   10.50% 10.50% 10.50% 10.50%        
Investment, interest rate (as a percent) [6],[8],[11] 6.80%   6.80% 6.80% 6.80% 6.80%        
Investment, interest rate, paid in kind (as a percent) [6],[11] 8.00%   8.00% 8.00% 8.00% 8.00%        
Investment, principal [6],[9],[11] $ 2,708                  
Investment owned, at cost [6],[11] 2,706                  
Investments at fair value [6],[11] $ 2,667                  
Investment, Identifier [Axis]: Alvogen Pharma US, Inc., Second Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 10.50%   10.50% 10.50% 10.50% 10.50%        
Investment, interest rate (as a percent) 6.80%   6.80% 6.80% 6.80% 6.80%        
Investment, interest rate, paid in kind (as a percent) 8.00%   8.00% 8.00% 8.00% 8.00%        
Investment, principal $ 1,397                  
Investment owned, at cost 1,396                  
Investments at fair value $ 1,376                  
Investment, Identifier [Axis]: Alvogen Pharma US, Inc., Second Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 10.50%   10.50% 10.50% 10.50% 10.50%        
Investment, interest rate (as a percent) 6.80%   6.80% 6.80% 6.80% 6.80%        
Investment, interest rate, paid in kind (as a percent) 8.00%   8.00% 8.00% 8.00% 8.00%        
Investment, principal $ 989                  
Investment owned, at cost 988                  
Investments at fair value $ 974                  
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, Common Stock 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 76,023 [10] 118,744 [13] 76,023 [10] 76,023 [10] 76,023 [10] 76,023 [10] 118,744 [13] 118,744 [13]    
Investment owned, at cost $ 76 [10] $ 206 [13]                
Investments at fair value $ 693 [10] $ 1,413 [13]                
Investment, Identifier [Axis]: Alvotech Holdings S.A., Biotechnology, Common Stock 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 70,820 [6],[10],[18] 70,820 [2],[13],[19] 70,820 [6],[10],[18] 70,820 [6],[10],[18] 70,820 [6],[10],[18] 70,820 [6],[10],[18] 70,820 [2],[13],[19] 70,820 [2],[13],[19]    
Investment owned, at cost $ 283 [6],[10],[18] $ 283 [2],[13],[19]                
Investments at fair value $ 244 [6],[10],[18] $ 315 [2],[13],[19]                
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Diversified Support Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [17]   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent) [3],[17]   9.75%         9.75% 9.75%    
Investment, principal [5],[17]   $ 2,487                
Investment owned, at cost [17]   2,469                
Investments at fair value [17]   $ 2,501                
Investment, Identifier [Axis]: American Auto Auction Group, LLC, Diversified Support Services, Second Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   8.75%         8.75% 8.75%    
Investment, interest rate (as a percent) [2],[3],[17]   13.50%         13.50% 13.50%    
Investment, principal [2],[5],[17]   $ 17,048                
Investment owned, at cost [2],[17]   16,556                
Investments at fair value [2],[17]   $ 16,494                
Investment, Identifier [Axis]: American Auto Auction Group, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50%   4.50% 4.50% 4.50% 4.50%        
Investment, interest rate (as a percent) 8.83%   8.83% 8.83% 8.83% 8.83%        
Investment, principal $ 5,188                  
Investment owned, at cost 5,149                  
Investments at fair value $ 5,219                  
Investment, Identifier [Axis]: American Auto Auction Group, LLC., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50%   4.50% 4.50% 4.50% 4.50%        
Investment, interest rate (as a percent) 8.83%   8.83% 8.83% 8.83% 8.83%        
Investment, principal $ 1,729                  
Investment owned, at cost 1,716                  
Investments at fair value $ 1,740                  
Investment, Identifier [Axis]: American Money Management Corporation, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [10],[11] 5.15%   5.15% 5.15% 5.15% 5.15%        
Investment, interest rate (as a percent) [8],[10],[11] 9.42%   9.42% 9.42% 9.42% 9.42%        
Investment, principal [9],[10],[11] $ 3,500                  
Investment owned, at cost [10],[11] 3,500                  
Investments at fair value [10],[11] $ 3,483                  
Investment, Identifier [Axis]: Amspec Parent LLC, Diversified Support Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   5.50%         5.50% 5.50%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   (98)                
Investments at fair value [1],[2],[17]   $ 0                
Investment, Identifier [Axis]: Amspec Parent LLC, Diversified Support Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   5.50%         5.50% 5.50%    
Investment, interest rate (as a percent) [2],[3],[17]   10.10%         10.10% 10.10%    
Investment, principal [2],[5],[17]   $ 33,390                
Investment owned, at cost [2],[17]   32,654                
Investments at fair value [2],[17]   $ 33,390                
Investment, Identifier [Axis]: Amspec Parent LLC, Diversified Support Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   5.50%         5.50% 5.50%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   (60)                
Investments at fair value [1],[2],[17]   $ 0                
Investment, Identifier [Axis]: Anchorage Capital CLO 20, LTD., Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [13],[17]   7.61%         7.61% 7.61%    
Investment, interest rate (as a percent) [3],[13],[17]   12.89%         12.89% 12.89%    
Investment, principal [5],[13],[17]   $ 750                
Investment owned, at cost [13],[17]   715                
Investments at fair value [13],[17]   $ 736                
Investment, Identifier [Axis]: Arches Buyer Inc., Interactive Media & Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.50% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [2],[17] 5.50% [2],[17]    
Investment, interest rate (as a percent) 9.83% [6],[8],[11] 10.35% [2],[3],[17] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 10.35% [2],[3],[17] 10.35% [2],[3],[17]    
Investment, principal $ 47,212 [6],[9],[11] $ 47,451 [2],[5],[17]                
Investment owned, at cost 46,775 [6],[11] 46,877 [2],[17]                
Investments at fair value $ 47,212 [6],[11] $ 47,428 [2],[17]                
Investment, Identifier [Axis]: Ares XLIV CLO, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.13% [10],[11] 7.13% [13],[17] 7.13% [10],[11] 7.13% [10],[11] 7.13% [10],[11] 7.13% [10],[11] 7.13% [13],[17] 7.13% [13],[17]    
Investment, interest rate (as a percent) 11.39% [8],[10],[11] 12.43% [3],[13],[17] 11.39% [8],[10],[11] 11.39% [8],[10],[11] 11.39% [8],[10],[11] 11.39% [8],[10],[11] 12.43% [3],[13],[17] 12.43% [3],[13],[17]    
Investment, principal $ 3,500 [9],[10],[11] $ 3,500 [5],[13],[17]                
Investment owned, at cost 3,404 [10],[11] 3,399 [13],[17]                
Investments at fair value $ 3,523 [10],[11] $ 3,509 [13],[17]                
Investment, Identifier [Axis]: Artera Services LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%    
Investment, interest rate (as a percent) 8.80% 9.10% 8.80% 8.80% 8.80% 8.80% 9.10% 9.10%    
Investment, principal $ 7,901 $ 7,961                
Investment owned, at cost 7,842 7,902                
Investments at fair value $ 6,652 $ 7,781                
Investment, Identifier [Axis]: Artera Services LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%    
Investment, interest rate (as a percent) 8.80% 9.10% 8.80% 8.80% 8.80% 8.80% 9.10% 9.10%    
Investment, principal $ 3,459 $ 3,485                
Investment owned, at cost 3,433 3,459                
Investments at fair value $ 2,912 $ 3,406                
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Specialized Finance, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 12,463,242 [6] 12,463,242 [2] 12,463,242 [6] 12,463,242 [6] 12,463,242 [6] 12,463,242 [6] 12,463,242 [2] 12,463,242 [2] 12,463,242  
Investment owned, at cost $ 1,963 [6] $ 1,963 [2]                
Investments at fair value $ 1,496 [6] $ 1,246 [2]             $ 1,246 89
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Specialized Finance, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investments at fair value                 $ 0 21,823
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Specialized Finance, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares                  
Investments at fair value                 $ 0 1,005
Investment, Identifier [Axis]: Assembled Brands Capital LLC, Specialized Finance, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 78,045 [6] 78,045 [2] 78,045 [6] 78,045 [6] 78,045 [6] 78,045 [6] 78,045 [2] 78,045 [2] 78,045  
Investment owned, at cost $ 0 [6] $ 0 [2]                
Investments at fair value $ 0 [6] $ 0 [2]             $ 0 0
Investment, Identifier [Axis]: Astra Acquisition Corp. , First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.75%         6.75% 6.75%    
Investment, interest rate (as a percent)   11.35%         11.35% 11.35%    
Investment, principal   $ 1,047                
Investment owned, at cost   1,035                
Investments at fair value   $ 868                
Investment, Identifier [Axis]: Astra Acquisition Corp., Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.75% [6],[11],[15] 6.75% [17] 6.75% [6],[11],[15] 6.75% [6],[11],[15] 6.75% [6],[11],[15] 6.75% [6],[11],[15] 6.75% [17] 6.75% [17]    
Investment, interest rate (as a percent) [3],[17]   11.35%         11.35% 11.35%    
Investment, principal $ 8,836 [6],[9],[11],[15] $ 7,907 [5],[17]                
Investment owned, at cost 8,368 [6],[11],[15] 7,816 [17]                
Investments at fair value $ 4,197 [6],[11],[15] $ 6,555 [17]                
Investment, Identifier [Axis]: Astra Acquisition Corp., Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[11],[15] 5.25% [2],[16],[17] 5.25% [6],[11],[15] 5.25% [6],[11],[15] 5.25% [6],[11],[15] 5.25% [6],[11],[15] 5.25% [2],[16],[17] 5.25% [2],[16],[17]    
Investment, principal $ 12,537 [6],[9],[11],[15] $ 12,537 [2],[5],[16],[17]                
Investment owned, at cost 9,872 [6],[11],[15] 10,187 [2],[16],[17]                
Investments at fair value $ 0 [6],[11],[15] $ 3,605 [2],[16],[17]                
Investment, Identifier [Axis]: Astra Acquisition Corp., First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment, interest rate (as a percent)   11.35%         11.35% 11.35%    
Investment, principal $ 2,527 $ 2,546                
Investment owned, at cost 2,500 2,517                
Investments at fair value $ 1,200 $ 2,111                
Investment, Identifier [Axis]: Astra Acquisition Corp., First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.75%   6.75% 6.75% 6.75% 6.75%        
Investment, principal $ 1,039                  
Investment owned, at cost 1,028                  
Investments at fair value $ 494                  
Investment, Identifier [Axis]: Astra Acquisition Corp., First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%    
Investment, interest rate (as a percent)              
Investment, principal $ 4,037 $ 4,037                
Investment owned, at cost 3,777 3,877                
Investments at fair value $ 0 $ 1,161                
Investment, Identifier [Axis]: Astra Acquisition Corp., First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%    
Investment, principal $ 1,661 $ 1,661                
Investment owned, at cost 1,577 1,619                
Investments at fair value $ 0 $ 477                
Investment, Identifier [Axis]: Asurion, LLC , First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent)   8.95%         8.95% 8.95%    
Investment, principal   $ 7,775                
Investment owned, at cost   7,589                
Investments at fair value   $ 7,660                
Investment, Identifier [Axis]: Asurion, LLC , First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent)   8.95%         8.95% 8.95%    
Investment, principal   $ 3,149                
Investment owned, at cost   3,073                
Investments at fair value   $ 3,102                
Investment, Identifier [Axis]: Asurion, LLC ,First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.25%         4.25% 4.25%    
Investment, interest rate (as a percent)   9.20%         9.20% 9.20%    
Investment, principal   $ 985                
Investment owned, at cost   943                
Investments at fair value   $ 972                
Investment, Identifier [Axis]: Asurion, LLC, First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.43%   8.43% 8.43% 8.43% 8.43%        
Investment, principal $ 7,716                  
Investment owned, at cost 7,561                  
Investments at fair value $ 7,620                  
Investment, Identifier [Axis]: Asurion, LLC, First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.43%   8.43% 8.43% 8.43% 8.43%        
Investment, principal $ 3,125                  
Investment owned, at cost 3,062                  
Investments at fair value $ 3,086                  
Investment, Identifier [Axis]: Asurion, LLC, First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25%    
Investment, interest rate (as a percent) 8.68% 9.20% 8.68% 8.68% 8.68% 8.68% 9.20% 9.20%    
Investment, principal $ 1,955 $ 1,970                
Investment owned, at cost 1,888 1,886                
Investments at fair value $ 1,937 $ 1,944                
Investment, Identifier [Axis]: Asurion, LLC, First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.68%   8.68% 8.68% 8.68% 8.68%        
Investment, principal $ 978                  
Investment owned, at cost 944                  
Investments at fair value $ 969                  
Investment, Identifier [Axis]: Asurion, LLC, Property & Casualty Insurance, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [11] 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) [8],[11] 8.68%   8.68% 8.68% 8.68% 8.68%        
Investment, principal [9],[11] $ 19,898                  
Investment owned, at cost [11] 19,856                  
Investments at fair value [11] $ 19,715                  
Investment, Identifier [Axis]: Aurelia Netherlands B.V., Interactive Media & Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 6.83%   6.83% 6.83% 6.83% 6.83%        
Investment, principal | € [6],[9],[10],[11]     € 47,682              
Investment owned, at cost [6],[10],[11] $ 53,198                  
Investments at fair value [6],[10],[11] $ 55,832                  
Investment, Identifier [Axis]: Aurelia Netherlands Midco 2 B.V., Interactive Media & Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[13],[17]   5.75%         5.75% 5.75%    
Investment, interest rate (as a percent) [2],[3],[13],[17]   9.55%         9.55% 9.55%    
Investment, principal | € [2],[5],[13],[17]             € 28,022      
Investment owned, at cost [2],[13],[17]   $ 29,727                
Investments at fair value [2],[13],[17]   $ 30,698                
Investment, Identifier [Axis]: Aurora Lux Finco S.À.R.L., Airport Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[10],[11] 7.00% [2],[13],[17] 6.00% [6],[10],[11] 6.00% [6],[10],[11] 6.00% [6],[10],[11] 6.00% [6],[10],[11] 7.00% [2],[13],[17] 7.00% [2],[13],[17]    
Investment, interest rate (as a percent) 10.40% [6],[8],[10],[11] 7.70% [2],[3],[13],[17] 10.40% [6],[8],[10],[11] 10.40% [6],[8],[10],[11] 10.40% [6],[8],[10],[11] 10.40% [6],[8],[10],[11] 7.70% [2],[3],[13],[17] 7.70% [2],[3],[13],[17]    
Investment, interest rate, paid in kind (as a percent) [6],[10],[11] 4.00% [2],[13],[17] [6],[10],[11] [6],[10],[11] [6],[10],[11] [6],[10],[11] 4.00% [2],[13],[17] 4.00% [2],[13],[17]    
Investment, principal $ 31,348 [6],[9],[10],[11] $ 30,724 [2],[5],[13],[17]                
Investment owned, at cost 31,190 [6],[10],[11] 30,169 [2],[13],[17]                
Investments at fair value $ 30,753 [6],[10],[11] $ 29,802 [2],[13],[17]                
Investment, Identifier [Axis]: Aurora Lux Finco S.À.R.L., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% 7.00% 6.00% 6.00% 6.00% 6.00% 7.00% 7.00%    
Investment, interest rate (as a percent) 10.40% 7.70% 10.40% 10.40% 10.40% 10.40% 7.70% 7.70%    
Investment, interest rate, paid in kind (as a percent)   4.00%         4.00% 4.00%    
Investment, principal $ 6,681 $ 6,548                
Investment owned, at cost 6,648 6,430                
Investments at fair value $ 6,554 $ 6,351                
Investment, Identifier [Axis]: Aurora Lux Finco S.À.R.L., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% 7.00% 6.00% 6.00% 6.00% 6.00% 7.00% 7.00%    
Investment, interest rate (as a percent) 10.40% 7.70% 10.40% 10.40% 10.40% 10.40% 7.70% 7.70%    
Investment, interest rate, paid in kind (as a percent) 4.00% 4.00% 4.00%    
Investment, principal $ 3,854 $ 3,778                
Investment owned, at cost 3,835 3,710                
Investments at fair value $ 3,781 $ 3,664                
Investment, Identifier [Axis]: Avalara, Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   6.25%         6.25% 6.25%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   (86)                
Investments at fair value [1],[2],[17]   $ 0                
Investment, Identifier [Axis]: Avalara, Inc., Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   6.25%         6.25% 6.25%    
Investment, interest rate (as a percent) [2],[3],[17]   10.85%         10.85% 10.85%    
Investment, principal [2],[5],[17]   $ 50,470                
Investment owned, at cost [2],[17]   49,836                
Investments at fair value [2],[17]   $ 50,470                
Investment, Identifier [Axis]: BAART Programs, Inc., First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%    
Investment, interest rate (as a percent) 9.56% 9.87% 9.56% 9.56% 9.56% 9.56% 9.87% 9.87%    
Investment, principal $ 1,722 $ 1,735                
Investment owned, at cost 1,711 1,724                
Investments at fair value $ 1,521 $ 1,633                
Investment, Identifier [Axis]: BAART Programs, Inc., First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%    
Investment, interest rate (as a percent) 9.56% 9.87% 9.56% 9.56% 9.56% 9.56% 9.87% 9.87%    
Investment, principal $ 785 $ 3,328                
Investment owned, at cost 781 3,298                
Investments at fair value $ 694 $ 3,133                
Investment, Identifier [Axis]: BAART Programs, Inc., First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) 9.56%   9.56% 9.56% 9.56% 9.56%        
Investment, principal $ 6,193                  
Investment owned, at cost 6,136                  
Investments at fair value $ 5,471                  
Investment, Identifier [Axis]: BAART Programs, Inc., First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%    
Investment, interest rate (as a percent) 9.56% 9.87% 9.56% 9.56% 9.56% 9.56% 9.87% 9.87%    
Investment, principal $ 3,303 $ 792                
Investment owned, at cost 3,272 787                
Investments at fair value $ 2,918 $ 745                
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[11] 5.00% [2],[17] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.56% [6],[8],[11] 9.87% [2],[3],[17] 9.56% [6],[8],[11] 9.56% [6],[8],[11] 9.56% [6],[8],[11] 9.56% [6],[8],[11] 9.87% [2],[3],[17] 9.87% [2],[3],[17]    
Investment, principal $ 3,189 [6],[9],[11] $ 3,214 [2],[5],[17]                
Investment owned, at cost 3,159 [6],[11] 3,183 [2],[17]                
Investments at fair value $ 2,817 [6],[11] $ 3,025 [2],[17]                
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[11] 5.00% [2],[17] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.56% [6],[8],[11] 9.87% [2],[3],[17] 9.56% [6],[8],[11] 9.56% [6],[8],[11] 9.56% [6],[8],[11] 9.56% [6],[8],[11] 9.87% [2],[3],[17] 9.87% [2],[3],[17]    
Investment, principal $ 1,239 [6],[9],[11] $ 1,248 [2],[5],[17]                
Investment owned, at cost 1,243 [6],[11] 1,254 [2],[17]                
Investments at fair value $ 1,094 [6],[11] $ 1,175 [2],[17]                
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, Second Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.50% [6],[11],[15] 8.50% [2],[17] 8.50% [6],[11],[15] 8.50% [6],[11],[15] 8.50% [6],[11],[15] 8.50% [6],[11],[15] 8.50% [2],[17] 8.50% [2],[17]    
Investment, interest rate (as a percent) [2],[3],[17]   13.35%         13.35% 13.35%    
Investment, principal $ 6,452 [6],[9],[11],[15] $ 6,452 [2],[5],[17]                
Investment owned, at cost 6,386 [6],[11],[15] 6,386 [2],[17]                
Investments at fair value $ 3,678 [6],[11],[15] $ 5,550 [2],[17]                
Investment, Identifier [Axis]: BAART Programs, Inc., Health Care Services, Second Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.50% [6],[11],[15] 8.50% [2],[17] 8.50% [6],[11],[15] 8.50% [6],[11],[15] 8.50% [6],[11],[15] 8.50% [6],[11],[15] 8.50% [2],[17] 8.50% [2],[17]    
Investment, interest rate (as a percent) [2],[3],[17]   13.37%         13.37% 13.37%    
Investment, principal $ 8,920 [6],[9],[11],[15] $ 8,920 [2],[5],[17]                
Investment owned, at cost 8,817 [6],[11],[15] 8,817 [2],[17]                
Investments at fair value $ 5,084 [6],[11],[15] $ 7,673 [2],[17]                
Investment, Identifier [Axis]: BAART Programs, Inc.,First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent)   9.87%         9.87% 9.87%    
Investment, principal   $ 6,242                
Investment owned, at cost   6,183                
Investments at fair value   $ 5,875                
Investment, Identifier [Axis]: BOTA BIDCO GMBH, Diversified Chemicals, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 5.93%   5.93% 5.93% 5.93% 5.93%        
Investment, principal | € [6],[9],[10],[11]     € 4,057              
Investment owned, at cost [6],[10],[11] $ 3,981                  
Investments at fair value [6],[10],[11] $ 4,589                  
Investment, Identifier [Axis]: BOTA BIDCO GMBH, Diversified Chemicals, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 4.50%   4.50% 4.50% 4.50% 4.50%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 6.48%   6.48% 6.48% 6.48% 6.48%        
Investment, principal [6],[9],[10],[11] $ 16,260                  
Investment owned, at cost [6],[10],[11] 15,939                  
Investments at fair value [6],[10],[11] $ 18,071                  
Investment, Identifier [Axis]: Barracuda Parent, LLC, Systems Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 6.50%   6.50% 6.50% 6.50% 6.50%        
Investment, interest rate (as a percent) [6],[8],[11] 10.78%   10.78% 10.78% 10.78% 10.78%        
Investment, principal [6],[9],[11] $ 15,448                  
Investment owned, at cost [6],[11] 15,014                  
Investments at fair value [6],[11] $ 15,040                  
Investment, Identifier [Axis]: Bausch + Lomb Corp, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.57%   8.57% 8.57% 8.57% 8.57%        
Investment, principal $ 3,699                  
Investment owned, at cost 3,655                  
Investments at fair value $ 3,711                  
Investment, Identifier [Axis]: Bausch + Lomb Corporation, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.25%         3.25% 3.25%    
Investment, interest rate (as a percent)   8.27%         8.27% 8.27%    
Investment, principal   $ 9,173                
Investment owned, at cost   9,017                
Investments at fair value   $ 9,151                
Investment, Identifier [Axis]: Bausch + Lomb Corporation, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.25%         3.25% 3.25%    
Investment, interest rate (as a percent)   8.27%         8.27% 8.27%    
Investment, principal   $ 3,718                
Investment owned, at cost   3,657                
Investments at fair value   $ 3,710                
Investment, Identifier [Axis]: Bausch + Lomb Corporation, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.57%   8.57% 8.57% 8.57% 8.57%        
Investment, principal $ 9,126                  
Investment owned, at cost 9,015                  
Investments at fair value $ 9,154                  
Investment, Identifier [Axis]: Beacon Mobility Corp, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 7.56%   7.56% 7.56% 7.56% 7.56%        
Investment, principal $ 4,500                  
Investment owned, at cost 4,467                  
Investments at fair value $ 4,500                  
Investment, Identifier [Axis]: Beacon Mobility Corp, First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.25%   3.25% 3.25% 3.25% 3.25%        
Investment, interest rate (as a percent)          
Investment, principal $ 0                  
Investment owned, at cost (5)                  
Investments at fair value $ 0                  
Investment, Identifier [Axis]: Beacon Mobility Corp, First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.25%   3.25% 3.25% 3.25% 3.25%        
Investment, interest rate (as a percent) 7.56%   7.56% 7.56% 7.56% 7.56%        
Investment, principal $ 1,656                  
Investment owned, at cost 1,644                  
Investments at fair value $ 1,656                  
Investment, Identifier [Axis]: Beacon Mobility Corp, First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.25%   3.25% 3.25% 3.25% 3.25%        
Investment, Identifier [Axis]: Beacon Mobility Corp, First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.25%   3.25% 3.25% 3.25% 3.25%        
Investment, principal $ 0                  
Investment owned, at cost (2)                  
Investments at fair value $ 0                  
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, Soft Drinks & Non-alcoholic Beverages, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, interest rate (as a percent) 13.00% [6],[7],[8],[11] 10.52% [1],[2],[3],[17] 13.00% [6],[7],[8],[11] 13.00% [6],[7],[8],[11] 13.00% [6],[7],[8],[11] 13.00% [6],[7],[8],[11] 10.52% [1],[2],[3],[17] 10.52% [1],[2],[3],[17]    
Investment, principal $ 1,076 [6],[7],[9],[11] $ 2,835 [1],[2],[5],[17]                
Investment owned, at cost 1,063 [6],[7],[11] 2,813 [1],[2],[17]                
Investments at fair value $ 1,034 [6],[7],[11] $ 2,811 [1],[2],[17]                
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, Soft Drinks & Non-alcoholic Beverages, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   5.50%         5.50% 5.50%    
Investment, interest rate (as a percent) [2],[3],[17]   10.90%         10.90% 10.90%    
Investment, principal [2],[5],[17]   $ 40,246                
Investment owned, at cost [2],[17]   40,085                
Investments at fair value [2],[17]   $ 39,863                
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, Soft Drinks & Non-alcoholic Beverages, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 6.50%   6.50% 6.50% 6.50% 6.50%        
Investment, interest rate (as a percent) [6],[8],[11] 10.93%   10.93% 10.93% 10.93% 10.93%        
Investment, principal [6],[9],[11] $ 39,934                  
Investment owned, at cost [6],[11] 39,817                  
Investments at fair value [6],[11] $ 39,283                  
Investment, Identifier [Axis]: Berner Food & Beverage, LLC, Soft Drinks & Non-alcoholic Beverages, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 6.50%   6.50% 6.50% 6.50% 6.50%        
Investment, interest rate (as a percent) [6],[8],[11] 10.93%   10.93% 10.93% 10.93% 10.93%        
Investment, principal [6],[9],[11] $ 4,379                  
Investment owned, at cost [6],[11] 4,344                  
Investments at fair value [6],[11] $ 4,307                  
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [10] 26,654   26,654 26,654 26,654 26,654        
Investment owned, at cost [10] $ 0                  
Investments at fair value [10] $ 48                  
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[13],[17]   7.50%         7.50% 7.50%    
Investment, interest rate (as a percent) 3.00% [6],[8],[10] [1],[2],[3],[13],[17] 3.00% [6],[8],[10] 3.00% [6],[8],[10] 3.00% [6],[8],[10] 3.00% [6],[8],[10] [1],[2],[3],[13],[17] [1],[2],[3],[13],[17]    
Investment, interest rate, paid in kind (as a percent) [6],[10] 10.00%   10.00% 10.00% 10.00% 10.00%        
Investment, principal $ 3,084 [6],[9],[10] $ 0 [1],[2],[5],[13],[17]                
Investment owned, at cost 3,082 [6],[10] 0 [1],[2],[13],[17]                
Investments at fair value $ 2,698 [6],[10] $ 0 [1],[2],[13],[17]                
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[13],[17]   7.50%         7.50% 7.50%    
Investment, interest rate (as a percent) 3.00% [6],[8],[10] 8.00% [2],[3],[13],[17] 3.00% [6],[8],[10] 3.00% [6],[8],[10] 3.00% [6],[8],[10] 3.00% [6],[8],[10] 8.00% [2],[3],[13],[17] 8.00% [2],[3],[13],[17]    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[10] 4.10% [2],[13],[17] 10.00% [6],[10] 10.00% [6],[10] 10.00% [6],[10] 10.00% [6],[10] 4.10% [2],[13],[17] 4.10% [2],[13],[17]    
Investment, principal $ 7,439 [6],[9],[10] $ 2,930 [2],[5],[13],[17]                
Investment owned, at cost 7,341 [6],[10] 2,928 [2],[13],[17]                
Investments at fair value $ 6,509 [6],[10] $ 2,600 [2],[13],[17]                
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[13],[17]   7.50%         7.50% 7.50%    
Investment, interest rate (as a percent) 3.00% [6],[7],[8],[10] 8.00% [2],[3],[13],[17] 3.00% [6],[7],[8],[10] 3.00% [6],[7],[8],[10] 3.00% [6],[7],[8],[10] 3.00% [6],[7],[8],[10] 8.00% [2],[3],[13],[17] 8.00% [2],[3],[13],[17]    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[7],[10] 4.10% [2],[13],[17] 10.00% [6],[7],[10] 10.00% [6],[7],[10] 10.00% [6],[7],[10] 10.00% [6],[7],[10] 4.10% [2],[13],[17] 4.10% [2],[13],[17]    
Investment, principal $ 0 [6],[7],[9],[10] $ 7,062 [2],[5],[13],[17]                
Investment owned, at cost 0 [6],[7],[10] 6,921 [2],[13],[17]                
Investments at fair value $ 0 [6],[7],[10] $ 6,268 [2],[13],[17]                
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[13],[17]   7.50%         7.50% 7.50%    
Investment, interest rate (as a percent) [6],[7],[8],[10] 3.00%   3.00% 3.00% 3.00% 3.00%        
Investment, interest rate, paid in kind (as a percent) [6],[7],[10] 10.00%   10.00% 10.00% 10.00% 10.00%        
Investment, principal $ 0 [6],[7],[9],[10] $ 0 [1],[2],[5],[13],[17]                
Investment owned, at cost 0 [6],[7],[10] 0 [1],[2],[13],[17]                
Investments at fair value $ 0 [6],[7],[10] $ 0 [1],[2],[13],[17]                
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, First Lien Term Loan 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[13],[17]   7.50%         7.50% 7.50%    
Investment, principal [1],[2],[5],[13],[17]   $ 0                
Investment owned, at cost [1],[2],[13],[17]   0                
Investments at fair value [1],[2],[13],[17]   $ 0                
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, Warrants 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 2,041 [6],[10] 32,664 [2],[13] 2,041 [6],[10] 2,041 [6],[10] 2,041 [6],[10] 2,041 [6],[10] 32,664 [2],[13] 32,664 [2],[13]    
Investment owned, at cost $ 225 [6],[10] $ 225 [2],[13]                
Investments at fair value $ 2 [6],[10] $ 10 [2],[13]                
Investment, Identifier [Axis]: BioXcel Therapeutics, Inc., Pharmaceuticals, Warrants 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 586 [6],[10] 9,382 [2],[13] 586 [6],[10] 586 [6],[10] 586 [6],[10] 586 [6],[10] 9,382 [2],[13] 9,382 [2],[13]    
Investment owned, at cost $ 0 [6],[10] $ 0 [2],[13]                
Investments at fair value $ 1 [6],[10] $ 3 [2],[13]                
Investment, Identifier [Axis]: Blackhawk Network Holdings Inc, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) 8.33%   8.33% 8.33% 8.33% 8.33%        
Investment, principal $ 7,960                  
Investment owned, at cost 7,960                  
Investments at fair value $ 8,013                  
Investment, Identifier [Axis]: Blackhawk Network Holdings, Inc., Data Processing & Outsourced Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [17]   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent) [3],[17]   9.85%         9.85% 9.85%    
Investment, principal [5],[17]   $ 19,336                
Investment owned, at cost [17]   18,991                
Investments at fair value [17]   $ 19,444                
Investment, Identifier [Axis]: Blumenthal Temecula, LLC, Automotive Retail, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 394,297 [6],[20] 394,297 [2] 394,297 [6],[20] 394,297 [6],[20] 394,297 [6],[20] 394,297 [6],[20] 394,297 [2] 394,297 [2]    
Investment owned, at cost $ 424 [6],[20] $ 424 [2]                
Investments at fair value $ 63 [6],[20] $ 79 [2]                
Investment, Identifier [Axis]: Blumenthal Temecula, LLC, Automotive Retail, Preferred Equity 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 1,708,618 [6] 1,708,618 [2] 1,708,618 [6] 1,708,618 [6] 1,708,618 [6] 1,708,618 [6] 1,708,618 [2] 1,708,618 [2]    
Investment owned, at cost $ 1,711 [6] $ 1,711 [2]                
Investments at fair value $ 2,409 [6] $ 2,136 [2]                
Investment, Identifier [Axis]: Blumenthal Temecula, LLC, Automotive Retail, Preferred Equity 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 394,297 [6] 394,297 [2] 394,297 [6] 394,297 [6] 394,297 [6] 394,297 [6] 394,297 [2] 394,297 [2]    
Investment owned, at cost $ 395 [6] $ 395 [2]                
Investments at fair value $ 528 [6] $ 477 [2]                
Investment, Identifier [Axis]: Boxer Parent Company Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.75%         3.75% 3.75%    
Investment, interest rate (as a percent)   9.01%         9.01% 9.01%    
Investment, principal   $ 8,000                
Investment owned, at cost   7,983                
Investments at fair value   $ 7,994                
Investment, Identifier [Axis]: Boxer Parent Company Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.00% 3.75% 3.00% 3.00% 3.00% 3.00% 3.75% 3.75%    
Investment, interest rate (as a percent) 7.33% 9.01% 7.33% 7.33% 7.33% 7.33% 9.01% 9.01%    
Investment, principal $ 2,993 $ 3,000                
Investment owned, at cost 2,985 2,993                
Investments at fair value $ 2,977 $ 2,998                
Investment, Identifier [Axis]: Boxer Parent Company Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.00%   3.00% 3.00% 3.00% 3.00%        
Investment, interest rate (as a percent) 7.33%   7.33% 7.33% 7.33% 7.33%        
Investment, principal $ 7,980                  
Investment owned, at cost 7,964                  
Investments at fair value $ 7,940                  
Investment, Identifier [Axis]: C5 Technology Holdings, LLC, Common Stock | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 171 171 171 171 171 171 171 171    
Investment owned, at cost $ 0 $ 0                
Investments at fair value $ 0 $ 0                
Investment, Identifier [Axis]: C5 Technology Holdings, LLC, Data Processing & Outsourced Services, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 829 [6] 829 [2] 829 [6] 829 [6] 829 [6] 829 [6] 829 [2] 829 [2] 829  
Investment owned, at cost $ 0 [6] $ 0 [2]                
Investments at fair value $ 0 [6] $ 0 [2]             $ 0 0
Investment, Identifier [Axis]: C5 Technology Holdings, LLC, Data Processing & Outsourced Services, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 34,984,460 [6] 34,984,460 [2] 34,984,460 [6] 34,984,460 [6] 34,984,460 [6] 34,984,460 [6] 34,984,460 [2] 34,984,460 [2] 34,984,460  
Investment owned, at cost $ 34,984 [6] $ 34,984 [2]                
Investments at fair value $ 25,889 [6] $ 27,638 [2]             $ 27,638 27,638
Investment, Identifier [Axis]: C5 Technology Holdings, LLC, Preferred Equity | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 7,193,540 7,193,540 7,193,540 7,193,540 7,193,540 7,193,540 7,193,540 7,193,540    
Investment owned, at cost $ 7,194 $ 7,194                
Investments at fair value $ 5,323 $ 5,683                
Investment, Identifier [Axis]: CBAM 2017-2, LTD., Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.36% [10],[11] 7.36% [13],[17] 7.36% [10],[11] 7.36% [10],[11] 7.36% [10],[11] 7.36% [10],[11] 7.36% [13],[17] 7.36% [13],[17]    
Investment, interest rate (as a percent) 11.64% [8],[10],[11] 12.65% [3],[13],[17] 11.64% [8],[10],[11] 11.64% [8],[10],[11] 11.64% [8],[10],[11] 11.64% [8],[10],[11] 12.65% [3],[13],[17] 12.65% [3],[13],[17]    
Investment, principal $ 489 [9],[10],[11] $ 489 [5],[13],[17]                
Investment owned, at cost 460 [10],[11] 458 [13],[17]                
Investments at fair value $ 485 [10],[11] $ 462 [13],[17]                
Investment, Identifier [Axis]: CD&R Firefly Bidco Limited, Other Specialty Retail, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [13],[17]   5.75%         5.75% 5.75%    
Investment, interest rate (as a percent) [3],[13],[17]   10.95%         10.95% 10.95%    
Investment, principal | £ [5],[13],[17]               £ 14,807    
Investment owned, at cost [13],[17]   $ 18,480                
Investments at fair value [13],[17]   $ 19,878                
Investment, Identifier [Axis]: CD&R Firefly Bidco Limited, Other Specialty Retail, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [13],[17]   5.50%         5.50% 5.50%    
Investment, interest rate (as a percent) [3],[13],[17]   10.45%         10.45% 10.45%    
Investment, principal [5],[13],[17]   $ 14,725                
Investment owned, at cost [13],[17]   18,330                
Investments at fair value [13],[17]   $ 19,782                
Investment, Identifier [Axis]: CFC Group (CFC USA 2025 LLC), First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75%   3.75% 3.75% 3.75% 3.75%        
Investment, interest rate (as a percent) 8.07%   8.07% 8.07% 8.07% 8.07%        
Investment, principal $ 2,152                  
Investment owned, at cost 2,130                  
Investments at fair value $ 2,147                  
Investment, Identifier [Axis]: CFC Group, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75%   3.75% 3.75% 3.75% 3.75%        
Investment, interest rate (as a percent) 8.07%   8.07% 8.07% 8.07% 8.07%        
Investment, principal $ 5,848                  
Investment owned, at cost 5,790                  
Investments at fair value $ 5,833                  
Investment, Identifier [Axis]: CIELO BIDCO LIMITED, Building Products, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[10],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, principal [6],[7],[9],[10],[11] $ 0                  
Investment owned, at cost [6],[7],[10],[11] 0                  
Investments at fair value [6],[7],[10],[11] $ 0                  
Investment, Identifier [Axis]: CIELO BIDCO LIMITED, Building Products, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[10],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, principal [6],[7],[9],[10],[11] $ 0                  
Investment owned, at cost [6],[7],[10],[11] 0                  
Investments at fair value [6],[7],[10],[11] $ 0                  
Investment, Identifier [Axis]: CIELO BIDCO LIMITED, Building Products, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [7],[10],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, principal [7],[9],[10],[11] $ 0                  
Investment owned, at cost [7],[10],[11] 0                  
Investments at fair value [7],[10],[11] $ 0                  
Investment, Identifier [Axis]: Caregiver Services, Inc., Health Care Services, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 1,080,398 1,080,398 [2] 1,080,398 1,080,398 1,080,398 1,080,398 1,080,398 [2] 1,080,398 [2] 1,080,398  
Investment owned, at cost [2]   $ 875                
Investments at fair value $ 0 $ 594 [2]             $ 227 432
Investment, Identifier [Axis]: Carlyle Global Market Strategies, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [10],[11] 7.50%   7.50% 7.50% 7.50% 7.50%        
Investment, interest rate (as a percent) [8],[10],[11] 11.77%   11.77% 11.77% 11.77% 11.77%        
Investment, principal [9],[10],[11] $ 3,575                  
Investment owned, at cost [10],[11] 3,733                  
Investments at fair value [10],[11] $ 3,668                  
Investment, Identifier [Axis]: Centerline Communications, LLC , First Lien Term Loan 3 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent)   11.16%         11.16% 11.16%    
Investment, principal   $ 1,955                
Investment owned, at cost   1,936                
Investments at fair value   $ 1,458                
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Delayed Draw Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, principal $ 1,994                  
Investment owned, at cost 1,946                  
Investments at fair value $ 1,075                  
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Revolver 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment, interest rate (as a percent)   11.50%         11.50% 11.50%    
Investment, principal $ 598 $ 600                
Investment owned, at cost 582 594                
Investments at fair value $ 322 $ 447                
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Revolver 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, principal $ 13                  
Investment owned, at cost 13                  
Investments at fair value $ 7                  
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Revolver2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent)   12.02%         12.02% 12.02%    
Investment, principal   $ 2                
Investment owned, at cost   2                
Investments at fair value   $ 1                
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment, interest rate (as a percent)   11.16%         11.16% 11.16%    
Investment, principal $ 2,358 $ 2,348                
Investment owned, at cost 2,319 2,325                
Investments at fair value $ 1,272 $ 1,751                
Investment, Identifier [Axis]: Centerline Communications, LLC, First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment, interest rate (as a percent)   12.27%         12.27% 12.27%    
Investment, principal $ 1,964 $ 1,976                
Investment owned, at cost 1,932 1,955                
Investments at fair value $ 1,059 $ 1,474                
Investment, Identifier [Axis]: Centralsquare Technologies, LLC, Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 6.00% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (29) [6],[7],[11] (33) [1],[2],[17]                
Investments at fair value $ (2) [6],[7],[11] $ (15) [1],[2],[17]                
Investment, Identifier [Axis]: Centralsquare Technologies, LLC, Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[11] 6.50% [2],[17] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.50% [2],[17] 6.50% [2],[17]    
Investment, interest rate (as a percent) 7.07% [6],[8],[11] 8.10% [2],[3],[17] 7.07% [6],[8],[11] 7.07% [6],[8],[11] 7.07% [6],[8],[11] 7.07% [6],[8],[11] 8.10% [2],[3],[17] 8.10% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) 3.25% [6],[11] 3.50% [2],[17] 3.25% [6],[11] 3.25% [6],[11] 3.25% [6],[11] 3.25% [6],[11] 3.50% [2],[17] 3.50% [2],[17]    
Investment, principal $ 13,079 [6],[9],[11] $ 12,830 [2],[5],[17]                
Investment owned, at cost 12,829 [6],[11] 12,539 [2],[17]                
Investments at fair value $ 13,059 [6],[11] $ 12,694 [2],[17]                
Investment, Identifier [Axis]: Cloud Software Group, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent)   8.60%         8.60% 8.60%    
Investment, principal   $ 8,153                
Investment owned, at cost   7,621                
Investments at fair value   $ 8,129                
Investment, Identifier [Axis]: Cloud Software Group, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75% 4.00% 3.75% 3.75% 3.75% 3.75% 4.00% 4.00%    
Investment, interest rate (as a percent) 8.05% 8.60% 8.05% 8.05% 8.05% 8.05% 8.60% 8.60%    
Investment, principal $ 1,194 $ 2,621                
Investment owned, at cost 1,194 2,456                
Investments at fair value $ 1,197 $ 2,613                
Investment, Identifier [Axis]: Cloud Software Group, Inc., First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75%   3.75% 3.75% 3.75% 3.75%        
Investment, interest rate (as a percent) 8.05%   8.05% 8.05% 8.05% 8.05%        
Investment, principal $ 2,488                  
Investment owned, at cost 2,488                  
Investments at fair value $ 2,494                  
Investment, Identifier [Axis]: Cloud Software Group, Inc., First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.50%   3.50% 3.50% 3.50% 3.50%        
Investment, interest rate (as a percent) 7.80%   7.80% 7.80% 7.80% 7.80%        
Investment, principal $ 6,026                  
Investment owned, at cost 5,698                  
Investments at fair value $ 6,039                  
Investment, Identifier [Axis]: Connect Finco SARL, Alternative Carriers, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [10],[11] 4.50%   4.50% 4.50% 4.50% 4.50%        
Investment, interest rate (as a percent) [8],[10],[11] 8.83%   8.83% 8.83% 8.83% 8.83%        
Investment, principal [9],[10],[11] $ 9,948                  
Investment owned, at cost [10],[11] 8,805                  
Investments at fair value [10],[11] $ 9,483                  
Investment, Identifier [Axis]: Continental Intermodal Group LP, Oil & Gas Storage & Transportation, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 22,267,661 [6] 22,267,661 [2] 22,267,661 [6] 22,267,661 [6] 22,267,661 [6] 22,267,661 [6] 22,267,661 [2] 22,267,661 [2] 22,267,661  
Investment owned, at cost $ 16,172 [6] $ 16,172 [2]                
Investments at fair value $ 10,466 [6] $ 12,247 [2]             $ 14,474 0
Investment, Identifier [Axis]: Continental Intermodal Group LP, Oil & Gas Storage & Transportation, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 3,137,476 [6] 3,137,476 [2] 3,137,476 [6] 3,137,476 [6] 3,137,476 [6] 3,137,476 [6] 3,137,476 [2] 3,137,476 [2] 3,137,476  
Investment owned, at cost $ 3,137 [6] $ 3,137 [2]                
Investments at fair value $ 3,577 [6] $ 3,357 [2]             $ 3,263 0
Investment, Identifier [Axis]: Conviva Inc., Application Software, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 417,851 [6] 417,851 [2] 417,851 [6] 417,851 [6] 417,851 [6] 417,851 [6] 417,851 [2] 417,851 [2]    
Investment owned, at cost $ 605 [6] $ 605 [2]                
Investments at fair value $ 894 [6] $ 894 [2]                
Investment, Identifier [Axis]: CoreRx, Inc., Pharmaceuticals, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% [6],[11] 7.50% [2],[17] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 7.50% [2],[17] 7.50% [2],[17]    
Investment, interest rate (as a percent) 11.80% [6],[8],[11] 12.10% [2],[3],[17] 11.80% [6],[8],[11] 11.80% [6],[8],[11] 11.80% [6],[8],[11] 11.80% [6],[8],[11] 12.10% [2],[3],[17] 12.10% [2],[3],[17]    
Investment, principal $ 6,494 [6],[9],[11] $ 6,494 [2],[5],[17]                
Investment owned, at cost 6,372 [6],[11] 6,347 [2],[17]                
Investments at fair value $ 6,354 [6],[11] $ 6,348 [2],[17]                
Investment, Identifier [Axis]: Coupa Holdings, LLC, Application Software First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.25%   5.25% 5.25% 5.25% 5.25%        
Investment, interest rate (as a percent) [6],[8],[11] 9.53%   9.53% 9.53% 9.53% 9.53%        
Investment, principal [6],[9],[11] $ 13,025                  
Investment owned, at cost [6],[11] 12,808                  
Investments at fair value [6],[11] $ 13,025                  
Investment, Identifier [Axis]: Coupa Holdings, LLC, Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[7],[11] 5.50% [1],[2],[17] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (14) [6],[7],[11] (17) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Coupa Holdings, LLC, Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   5.50%         5.50% 5.50%    
Investment owned, at cost [1],[2],[17]   $ (15)                
Investments at fair value [1],[2],[17]   $ 0                
Investment, Identifier [Axis]: Coupa Holdings, LLC, Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[7],[11] 5.50% [2],[17] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.50% [2],[17] 5.50% [2],[17]    
Investment, interest rate (as a percent) [2],[3],[17]   10.75%         10.75% 10.75%    
Investment, principal $ 0 [6],[7],[9],[11] $ 13,124 [2],[5],[17]                
Investment owned, at cost (10) [6],[7],[11] 12,870 [2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ 13,124 [2],[17]                
Investment, Identifier [Axis]: Covetrus, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent)   9.60%         9.60% 9.60%    
Investment, principal   $ 7,765                
Investment owned, at cost   7,428                
Investments at fair value   $ 7,381                
Investment, Identifier [Axis]: Covetrus, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.50% 5.00% 3.50% 3.50% 3.50% 3.50% 5.00% 5.00%    
Investment, interest rate (as a percent) 7.80% 9.60% 7.80% 7.80% 7.80% 7.80% 9.60% 9.60%    
Investment, principal $ 1,937 $ 2,570                
Investment owned, at cost 1,836 2,446                
Investments at fair value $ 1,941 $ 2,443                
Investment, Identifier [Axis]: Covetrus, Inc., Health Care Distributors, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [17]   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent) [3],[17]   9.60%         9.60% 9.60%    
Investment, principal [5],[17]   $ 10,878                
Investment owned, at cost [17]   10,518                
Investments at fair value [17]   $ 10,341                
Investment, Identifier [Axis]: Creek Parent, Inc., Life Sciences Tools & Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.25%   5.25% 5.25% 5.25% 5.25%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (111)                  
Investments at fair value [6],[7],[11] $ (112)                  
Investment, Identifier [Axis]: Creek Parent, Inc.., Life Sciences Tools & Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.25%   5.25% 5.25% 5.25% 5.25%        
Investment, interest rate (as a percent) [6],[8],[11] 9.57%   9.57% 9.57% 9.57% 9.57%        
Investment, principal [6],[9],[11] $ 47,865                  
Investment owned, at cost [6],[11] 47,091                  
Investments at fair value [6],[11] $ 47,085                  
Investment, Identifier [Axis]: Crewline Buyer, Inc., Systems Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.75% [6],[7],[11] 6.75% [1],[2],[17] 6.75% [6],[7],[11] 6.75% [6],[7],[11] 6.75% [6],[7],[11] 6.75% [6],[7],[11] 6.75% [1],[2],[17] 6.75% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (42) [6],[7],[11] (48) [1],[2],[17]                
Investments at fair value $ (22) [6],[7],[11] $ (31) [1],[2],[17]                
Investment, Identifier [Axis]: Crewline Buyer, Inc., Systems Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   6.75%         6.75% 6.75%    
Investment, interest rate (as a percent) [2],[3],[17]   11.35%         11.35% 11.35%    
Investment, principal [2],[5],[17]   $ 20,924                
Investment owned, at cost [2],[17]   20,468                
Investments at fair value [2],[17]   $ 20,627                
Investment, Identifier [Axis]: Crewline Buyer, Inc., Systems Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 6.75%   6.75% 6.75% 6.75% 6.75%        
Investment, interest rate (as a percent) [6],[8],[11] 11.08%   11.08% 11.08% 11.08% 11.08%        
Investment, principal [6],[9],[11] $ 20,924                  
Investment owned, at cost [6],[11] 20,524                  
Investments at fair value [6],[11] $ 20,715                  
Investment, Identifier [Axis]: Crewline Buyer, Inc., Systems Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 6.75%   6.75% 6.75% 6.75% 6.75%        
Investment, interest rate (as a percent) [6],[8],[11] 11.08%   11.08% 11.08% 11.08% 11.08%        
Investment, principal [6],[9],[11] $ 1,420                  
Investment owned, at cost [6],[11] 1,388                  
Investments at fair value [6],[11] $ 1,406                  
Investment, Identifier [Axis]: Crown Subsea Communications Holding, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%    
Investment, interest rate (as a percent) 8.33% 9.25% 8.33% 8.33% 8.33% 8.33% 9.25% 9.25%    
Investment, principal $ 7,920 $ 7,980                
Investment owned, at cost 7,852 7,900                
Investments at fair value $ 7,981 $ 8,039                
Investment, Identifier [Axis]: Crown Subsea Communications Holding, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00% 4.00%    
Investment, interest rate (as a percent) 8.33% 9.25% 8.33% 8.33% 8.33% 8.33% 9.25% 9.25%    
Investment, principal $ 2,970 $ 2,993                
Investment owned, at cost 2,944 2,963                
Investments at fair value $ 2,993 $ 3,015                
Investment, Identifier [Axis]: Curium Bidco S.à.r.l., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent)   8.60%         8.60% 8.60%    
Investment, principal   $ 8,643                
Investment owned, at cost   8,559                
Investments at fair value   $ 8,684                
Investment, Identifier [Axis]: Curium Bidco S.à.r.l., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent)   8.60%         8.60% 8.60%    
Investment, principal   $ 2,813                
Investment owned, at cost   2,792                
Investments at fair value   $ 2,826                
Investment, Identifier [Axis]: DTI Holdco, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% 4.75% 4.00% 4.00% 4.00% 4.00% 4.75% 4.75%    
Investment, interest rate (as a percent) 8.33% 9.60% 8.33% 8.33% 8.33% 8.33% 9.60% 9.60%    
Investment, principal $ 8,983 $ 9,029                
Investment owned, at cost 8,887 8,913                
Investments at fair value $ 8,893 $ 9,076                
Investment, Identifier [Axis]: DTI Holdco, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% 4.75% 4.00% 4.00% 4.00% 4.00% 4.75% 4.75%    
Investment, interest rate (as a percent) 8.33% 9.60% 8.33% 8.33% 8.33% 8.33% 9.60% 9.60%    
Investment, principal $ 3,517 $ 3,534                
Investment owned, at cost 3,479 3,488                
Investments at fair value $ 3,481 $ 3,553                
Investment, Identifier [Axis]: DTI Holdco, Inc., Research & Consulting Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [11] 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) [8],[11] 8.33%   8.33% 8.33% 8.33% 8.33%        
Investment, principal [9],[11] $ 17,940                  
Investment owned, at cost [11] 17,884                  
Investments at fair value [11] $ 17,759                  
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 2 [6],[10] 2 [2],[13] 2 [6],[10] 2 [6],[10] 2 [6],[10] 2 [6],[10] 2 [2],[13] 2 [2],[13]    
Investment owned, at cost $ 2 [6],[10] $ 2 [2],[13]                
Investments at fair value $ 3 [6],[10] $ 2 [2],[13]                
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 419 [6],[10] 419 [2],[13] 419 [6],[10] 419 [6],[10] 419 [6],[10] 419 [6],[10] 419 [2],[13] 419 [2],[13]    
Investment owned, at cost $ 419 [6],[10] $ 419 [2],[13]                
Investments at fair value $ 578 [6],[10] $ 531 [2],[13]                
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Subordinated Debt Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 8.00% [6],[8],[10] 8.00% [1],[2],[3],[13] 8.00% [6],[8],[10] 8.00% [6],[8],[10] 8.00% [6],[8],[10] 8.00% [6],[8],[10] 8.00% [1],[2],[3],[13] 8.00% [1],[2],[3],[13]    
Investment, interest rate, paid in kind (as a percent) 3.00% [6],[10] 3.00% [1],[2],[13] 3.00% [6],[10] 3.00% [6],[10] 3.00% [6],[10] 3.00% [6],[10] 3.00% [1],[2],[13] 3.00% [1],[2],[13]    
Investment, principal $ 12,286 [6],[9],[10] $ 8,456 [1],[2],[5],[13]                
Investment owned, at cost 12,286 [6],[10] 8,456 [1],[2],[13]                
Investments at fair value $ 12,286 [6],[10] $ 8,456 [1],[2],[13]                
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Subordinated Debt Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 3.00% [6],[8],[10] 3.00% [2],[3],[13] 3.00% [6],[8],[10] 3.00% [6],[8],[10] 3.00% [6],[8],[10] 3.00% [6],[8],[10] 3.00% [2],[3],[13] 3.00% [2],[3],[13]    
Investment, interest rate, paid in kind (as a percent) 7.00% [6],[10] 7.00% [2],[13] 7.00% [6],[10] 7.00% [6],[10] 7.00% [6],[10] 7.00% [6],[10] 7.00% [2],[13] 7.00% [2],[13]    
Investment, principal $ 36,149 [6],[9],[10] $ 34,316 [2],[5],[13]                
Investment owned, at cost 36,149 [6],[10] 34,316 [2],[13]                
Investments at fair value $ 36,149 [6],[10] $ 34,316 [2],[13]                
Investment, Identifier [Axis]: Delta Leasing SPV II LLC, Specialized Finance, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 31 [6],[10] 31 [2],[13] 31 [6],[10] 31 [6],[10] 31 [6],[10] 31 [6],[10] 31 [2],[13] 31 [2],[13]    
Investment owned, at cost $ 0 [6],[10] $ 0 [2],[13]                
Investments at fair value $ 0 [6],[10] $ 0 [2],[13]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [2],[17]    
Investment, interest rate, paid in kind (as a percent) [2],[17]   15.75%         15.75% 15.75%    
Investment, principal $ 25,623 [6],[9],[11],[15] $ 23,660 [2],[5],[17]                
Investment owned, at cost 23,277 [6],[11],[15] 23,264 [2],[17]                
Investments at fair value $ 5,125 [6],[11],[15] $ 21,175 [2],[17]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 10                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11],[15] 11.00%   11.00% 11.00% 11.00% 11.00%        
Investment, principal [6],[9],[11],[15] $ 411                  
Investment owned, at cost [6],[11],[15] 411                  
Investments at fair value [6],[11],[15] $ 82                  
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [2],[17]    
Investment, interest rate, paid in kind (as a percent) [2],[17]   15.75%         15.75% 15.75%    
Investment, principal $ 735 [6],[9],[11],[15] $ 655 [2],[5],[17]                
Investment owned, at cost 655 [6],[11],[15] 655 [2],[17]                
Investments at fair value $ 147 [6],[11],[15] $ 586 [2],[17]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [2],[17]    
Investment, interest rate, paid in kind (as a percent) [2],[17]   15.75%         15.75% 15.75%    
Investment, principal $ 727 [6],[9],[11],[15] $ 647 [2],[5],[17]                
Investment owned, at cost 651 [6],[11],[15] 647 [2],[17]                
Investments at fair value $ 145 [6],[11],[15] $ 579 [2],[17]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [2],[17]    
Investment, interest rate, paid in kind (as a percent) [2],[17]   15.75%         15.75% 15.75%    
Investment, principal $ 1,166 [6],[9],[11],[15] $ 1,039 [2],[5],[17]                
Investment owned, at cost 1,042 [6],[11],[15] 1,039 [2],[17]                
Investments at fair value $ 233 [6],[11],[15] $ 929 [2],[17]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [6],[11],[15] 11.00% [2],[17] 11.00% [2],[17]    
Investment, interest rate, paid in kind (as a percent) [2],[17]   15.75%         15.75% 15.75%    
Investment, principal $ 956 [6],[9],[11],[15] $ 852 [2],[5],[17]                
Investment owned, at cost 855 [6],[11],[15] 852 [2],[17]                
Investments at fair value $ 191 [6],[11],[15] $ 762 [2],[17]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 6                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11],[15] 11.00%   11.00% 11.00% 11.00% 11.00%        
Investment, principal [6],[9],[11],[15] $ 331                  
Investment owned, at cost [6],[11],[15] 308                  
Investments at fair value [6],[11],[15] $ 66                  
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 7                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11],[15] 11.00%   11.00% 11.00% 11.00% 11.00%        
Investment, principal [6],[9],[11],[15] $ 1,914                  
Investment owned, at cost [6],[11],[15] 1,745                  
Investments at fair value [6],[11],[15] $ 383                  
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 8                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11],[15] 11.00%   11.00% 11.00% 11.00% 11.00%        
Investment, principal [6],[9],[11],[15] $ 429                  
Investment owned, at cost [6],[11],[15] 429                  
Investments at fair value [6],[11],[15] $ 86                  
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, First Lien Term Loan 9                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11],[15] 11.00%   11.00% 11.00% 11.00% 11.00%        
Investment, principal [6],[7],[9],[11],[15] $ 0                  
Investment owned, at cost [6],[7],[11],[15] 0                  
Investments at fair value [6],[7],[11],[15] $ (985)                  
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, Subordinated Debt Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[15] 10.00% [2],[16] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [2],[16] 10.00% [2],[16]    
Investment, principal $ 782 [6],[9],[15] $ 725 [2],[5],[16]                
Investment owned, at cost 762 [6],[15] 724 [2],[16]                
Investments at fair value $ 0 [6],[15] $ 375 [2],[16]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, Subordinated Debt Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[15] 10.00% [2],[16] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [2],[16] 10.00% [2],[16]    
Investment, principal $ 1,034 [6],[9],[15] $ 959 [2],[5],[16]                
Investment owned, at cost 0 [6],[15] 0 [2],[16]                
Investments at fair value $ 0 [6],[15] $ 496 [2],[16]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, Subordinated Debt Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[15] 10.00% [2],[16] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [2],[16] 10.00% [2],[16]    
Investment, principal $ 1,027 [6],[9],[15] $ 952 [2],[5],[16]                
Investment owned, at cost 0 [6],[15] 0 [2],[16]                
Investments at fair value $ 0 [6],[15] $ 493 [2],[16]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, Subordinated Debt Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[15] 10.00% [2],[16] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [2],[16] 10.00% [2],[16]    
Investment, principal $ 1,810 [6],[9],[15] $ 1,679 [2],[5],[16]                
Investment owned, at cost 0 [6],[15] 0 [2],[16]                
Investments at fair value $ 0 [6],[15] $ 869 [2],[16]                
Investment, Identifier [Axis]: Dialyze Holdings, LLC, Health Care Equipment, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 6,397,254 [6] 6,397,254 [2] 6,397,254 [6] 6,397,254 [6] 6,397,254 [6] 6,397,254 [6] 6,397,254 [2] 6,397,254 [2]    
Investment owned, at cost $ 1,642 [6] $ 1,642 [2]                
Investments at fair value $ 0 [6] $ 0 [2]                
Investment, Identifier [Axis]: Digital.AI Software Holdings, Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 10.30%   10.30% 10.30% 10.30% 10.30%        
Investment, principal $ 1,007 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 1,007 [6],[7],[11] 0 [1],[2],[17]                
Investments at fair value $ 902 [6],[7],[11] $ (36) [1],[2],[17]                
Investment, Identifier [Axis]: Digital.AI Software Holdings, Inc., Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[11] 6.00% [2],[17] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 10.30% [6],[8],[11] 10.60% [2],[3],[17] 10.30% [6],[8],[11] 10.30% [6],[8],[11] 10.30% [6],[8],[11] 10.30% [6],[8],[11] 10.60% [2],[3],[17] 10.60% [2],[3],[17]    
Investment, principal $ 54,031 [6],[9],[11] $ 54,454 [2],[5],[17]                
Investment owned, at cost 54,030 [6],[11] 54,449 [2],[17]                
Investments at fair value $ 53,085 [6],[11] $ 54,127 [2],[17]                
Investment, Identifier [Axis]: Digital.AI Software Holdings, Inc., Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[11] 6.00% [2],[17] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 10.30% [6],[8],[11] 10.60% [2],[3],[17] 10.30% [6],[8],[11] 10.30% [6],[8],[11] 10.30% [6],[8],[11] 10.30% [6],[8],[11] 10.60% [2],[3],[17] 10.60% [2],[3],[17]    
Investment, principal $ 2,916 [6],[9],[11] $ 2,939 [2],[5],[17]                
Investment owned, at cost 2,895 [6],[11] 2,913 [2],[17]                
Investments at fair value $ 2,865 [6],[11] $ 2,921 [2],[17]                
Investment, Identifier [Axis]: DirecTV Financing, LLC, Cable & Satellite, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [11] 5.50%   5.50% 5.50% 5.50% 5.50%        
Investment, interest rate (as a percent) [8],[11] 9.83%   9.83% 9.83% 9.83% 9.83%        
Investment, principal [9],[11] $ 13,953                  
Investment owned, at cost [11] 13,685                  
Investments at fair value [11] $ 13,357                  
Investment, Identifier [Axis]: DirecTV Financing, LLC, Cable & Satellite, First Rate Bond                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [8] 10.00%   10.00% 10.00% 10.00% 10.00%        
Investment, principal [9] $ 14,203                  
Investment owned, at cost 14,203                  
Investments at fair value $ 13,798                  
Investment, Identifier [Axis]: DirecTV Financing, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%    
Investment, interest rate (as a percent) 9.79% 10.21% 9.79% 9.79% 9.79% 9.79% 10.21% 10.21%    
Investment, principal $ 8,080 $ 6,711                
Investment owned, at cost 7,984 6,635                
Investments at fair value $ 8,032 $ 6,618                
Investment, Identifier [Axis]: DirecTV Financing, LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%    
Investment, interest rate (as a percent) 9.79% 10.21% 9.79% 9.79% 9.79% 9.79% 10.21% 10.21%    
Investment, principal $ 2,743 $ 2,957                
Investment owned, at cost 2,719 2,932                
Investments at fair value $ 2,726 $ 2,916                
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 30,031 [6] 30,031 [2] 30,031 [6] 30,031 [6] 30,031 [6] 30,031 [6] 30,031 [2] 30,031 [2] 30,031  
Investment owned, at cost $ 15,222 [6] $ 15,222 [2]                
Investments at fair value $ 0 [6] $ 0 [2]             $ 0 2,711
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% 5.00% [2],[17] 5.00% 5.00% 5.00% 5.00% 5.00% [2],[17] 5.00% [2],[17] 5.00%  
Investment, interest rate (as a percent)   9.75% [2],[3],[17]         9.75% [2],[3],[17] 9.75% [2],[3],[17] 10.48%  
Investment, principal $ 0 $ 5,574 [2],[5],[17]             $ 5,574  
Investment owned, at cost [2],[17]   5,574                
Investments at fair value $ 0 4,546 [2],[17]             $ 5,222 5,574
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal $ 0                  
Investments at fair value $ 0 11,360                
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal $ 0                  
Investments at fair value $ 0 (1,028)                
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[11],[15]   5.00% [6],[11],[15] 5.00% [6],[11],[15] 5.00% [6],[11],[15] 5.00% [6],[11],[15]     5.00%  
Investment, interest rate (as a percent)                 10.48%  
Investment, principal $ 6,967 [6],[9],[11],[15]               $ 13,963  
Investment owned, at cost [6],[11],[15] 5,303                  
Investments at fair value $ 5,351 [6],[11],[15] 0             $ 13,081 14,068
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% [6],[11],[15]   6.50% [6],[11],[15] 6.50% [6],[11],[15] 6.50% [6],[11],[15] 6.50% [6],[11],[15]     5.00%  
Investment, interest rate (as a percent)                 10.48%  
Investment, principal $ 12,465 [6],[9],[11],[15]               $ 0  
Investment owned, at cost [6],[11],[15] 13,182                  
Investments at fair value $ 0 [6],[11],[15] $ 0             0 2,090
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent) [2],[3],[17]   9.74%         9.74% 9.74%    
Investment, principal [2],[5],[17]   $ 13,928                
Investment owned, at cost [2],[17]   13,928                
Investments at fair value [2],[17]   $ 11,360                
Investment, Identifier [Axis]: Dominion Diagnostics, LLC, Health Care Services, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   5.00%         5.00% 5.00%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   0                
Investments at fair value [1],[2],[17]   $ (1,028)                
Investment, Identifier [Axis]: Draken International, LLC, Aerospace & Defense, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 5.50%   5.50% 5.50% 5.50% 5.50%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 9.71%   9.71% 9.71% 9.71% 9.71%        
Investment, principal | € [6],[9],[10],[11]     € 15,711              
Investment owned, at cost [6],[10],[11] $ 20,589                  
Investments at fair value [6],[10],[11] $ 21,129                  
Investment, Identifier [Axis]: Draken International, LLC, Aerospace & Defense, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 5.50%   5.50% 5.50% 5.50% 5.50%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 9.82%   9.82% 9.82% 9.82% 9.82%        
Investment, principal [6],[9],[10],[11] $ 4,992                  
Investment owned, at cost [6],[10],[11] 4,894                  
Investments at fair value [6],[10],[11] $ 4,900                  
Investment, Identifier [Axis]: Draken International, LLC, Aerospace & Defense, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[10],[11] 5.50%   5.50% 5.50% 5.50% 5.50%        
Investment, principal [6],[7],[9],[10],[11] $ 0                  
Investment owned, at cost [6],[7],[10],[11] (58)                  
Investments at fair value [6],[7],[10],[11] $ (55)                  
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, Leisure Facilities, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 12,500 [6] 12,500 [2] 12,500 [6] 12,500 [6] 12,500 [6] 12,500 [6] 12,500 [2] 12,500 [2]    
Investment owned, at cost $ 0 [6] $ 0 [2]                
Investments at fair value $ 9,680 [6] $ 0 [2]                
Investment, Identifier [Axis]: EOS Fitness Opco Holdings, LLC, Leisure Facilities, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 488 [6] 488 [2] 488 [6] 488 [6] 488 [6] 488 [6] 488 [2] 488 [2]    
Investment owned, at cost $ 488 [6] $ 488 [2]                
Investments at fair value $ 2,092 [6] $ 1,345 [2]                
Investment, Identifier [Axis]: Eagle Parent Corp., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25%    
Investment, interest rate (as a percent) 8.55% 9.55% 8.55% 8.55% 8.55% 8.55% 9.55% 9.55%    
Investment, principal $ 1,170 $ 1,179                
Investment owned, at cost 1,168 1,177                
Investments at fair value $ 1,162 $ 1,121                
Investment, Identifier [Axis]: Eagle Parent Corp., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25% 4.25%    
Investment, interest rate (as a percent) 8.55% 8.85% 8.55% 8.55% 8.55% 8.55% 8.85% 8.85%    
Investment, principal $ 389 $ 392                
Investment owned, at cost 385 387                
Investments at fair value $ 387 $ 373                
Investment, Identifier [Axis]: Eagleview Technology Corporation, Application Software, Second Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   7.50%         7.50% 7.50%    
Investment, interest rate (as a percent) [2],[3],[17]   12.25%         12.25% 12.25%    
Investment, principal [2],[5],[17]   $ 8,974                
Investment owned, at cost [2],[17]   8,884                
Investments at fair value [2],[17]   $ 8,121                
Investment, Identifier [Axis]: Engineering Research and Consulting LLC, Construction & Engineering, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [11] 5.00% [2],[17] 5.00% [11] 5.00% [11] 5.00% [11] 5.00% [11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.29% [8],[11] 10.06% [2],[3],[17] 9.29% [8],[11] 9.29% [8],[11] 9.29% [8],[11] 9.29% [8],[11] 10.06% [2],[3],[17] 10.06% [2],[3],[17]    
Investment, principal $ 11,873 [9],[11] $ 11,933 [2],[5],[17]                
Investment owned, at cost 11,664 [11] 11,697 [2],[17]                
Investments at fair value $ 11,636 [11] $ 11,858 [2],[17]                
Investment, Identifier [Axis]: Engineering Research and Consulting LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent)   10.06%         10.06% 10.06%    
Investment, principal   $ 4,208                
Investment owned, at cost   4,149                
Investments at fair value   $ 4,182                
Investment, Identifier [Axis]: Engineering Research and Consulting LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent)   10.06%         10.06% 10.06%    
Investment, principal   $ 1,025                
Investment owned, at cost   1,011                
Investments at fair value   $ 1,019                
Investment, Identifier [Axis]: Engineering Research and Consulting LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) 9.29%   9.29% 9.29% 9.29% 9.29%        
Investment, principal $ 4,187                  
Investment owned, at cost 4,132                  
Investments at fair value $ 4,103                  
Investment, Identifier [Axis]: Engineering Research and Consulting LLC., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) 9.29%   9.29% 9.29% 9.29% 9.29%        
Investment, principal $ 1,020                  
Investment owned, at cost 1,006                  
Investments at fair value $ 999                  
Investment, Identifier [Axis]: Enverus Holdings, Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, interest rate (as a percent) 9.82% [6],[7],[8],[11] 10.35% [1],[2],[3],[17] 9.82% [6],[7],[8],[11] 9.82% [6],[7],[8],[11] 9.82% [6],[7],[8],[11] 9.82% [6],[7],[8],[11] 10.35% [1],[2],[3],[17] 10.35% [1],[2],[3],[17]    
Investment, principal $ 137 [6],[7],[9],[11] $ 121 [1],[2],[5],[17]                
Investment owned, at cost 116 [6],[7],[11] 96 [1],[2],[17]                
Investments at fair value $ 137 [6],[7],[11] $ 121 [1],[2],[17]                
Investment, Identifier [Axis]: Enverus Holdings, Inc., Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.50% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [2],[17] 5.50% [2],[17]    
Investment, interest rate (as a percent) 9.83% [6],[8],[11] 10.35% [2],[3],[17] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 10.35% [2],[3],[17] 10.35% [2],[3],[17]    
Investment, principal $ 25,323 [6],[9],[11] $ 24,741 [2],[5],[17]                
Investment owned, at cost 24,955 [6],[11] 24,369 [2],[17]                
Investments at fair value $ 25,323 [6],[11] $ 24,741 [2],[17]                
Investment, Identifier [Axis]: Enverus Holdings, Inc., Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (8) [6],[7],[11] (16) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Establishment Labs Holdings Inc., Health Care Technology, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 9.00% [6],[8],[10] 9.00% [2],[3],[13] 9.00% [6],[8],[10] 9.00% [6],[8],[10] 9.00% [6],[8],[10] 9.00% [6],[8],[10] 9.00% [2],[3],[13] 9.00% [2],[3],[13]    
Investment, principal $ 1,834 [6],[9],[10] $ 1,834 [2],[5],[13]                
Investment owned, at cost 1,822 [6],[10] 1,817 [2],[13]                
Investments at fair value $ 1,834 [6],[10] $ 1,834 [2],[13]                
Investment, Identifier [Axis]: Establishment Labs Holdings Inc., Health Care Technology, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 10.00% [6],[8],[10] 9.00% [1],[2],[3],[13] 10.00% [6],[8],[10] 10.00% [6],[8],[10] 10.00% [6],[8],[10] 10.00% [6],[8],[10] 9.00% [1],[2],[3],[13] 9.00% [1],[2],[3],[13]    
Investment, principal $ 1,692 [6],[9],[10] $ 0 [1],[2],[5],[13]                
Investment owned, at cost 1,658 [6],[10] 1 [1],[2],[13]                
Investments at fair value $ 1,726 [6],[10] $ 0 [1],[2],[13]                
Investment, Identifier [Axis]: Establishment Labs Holdings Inc., Health Care Technology, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 10.00% [6],[7],[8],[10] 9.00% [1],[2],[3],[13] 10.00% [6],[7],[8],[10] 10.00% [6],[7],[8],[10] 10.00% [6],[7],[8],[10] 10.00% [6],[7],[8],[10] 9.00% [1],[2],[3],[13] 9.00% [1],[2],[3],[13]    
Investment, principal $ 0 [6],[7],[9],[10] $ 0 [1],[2],[5],[13]                
Investment owned, at cost 0 [6],[7],[10] 1 [1],[2],[13]                
Investments at fair value $ 0 [6],[7],[10] $ 0 [1],[2],[13]                
Investment, Identifier [Axis]: Establishment Labs Holdings Inc., Health Care Technology, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 9.00% [6],[8],[10] 9.00% [2],[3],[13] 9.00% [6],[8],[10] 9.00% [6],[8],[10] 9.00% [6],[8],[10] 9.00% [6],[8],[10] 9.00% [2],[3],[13] 9.00% [2],[3],[13]    
Investment, principal $ 11,454 [6],[9],[10] $ 11,454 [2],[5],[13]                
Investment owned, at cost 11,397 [6],[10] 11,374 [2],[13]                
Investments at fair value $ 11,454 [6],[10] $ 11,454 [2],[13]                
Investment, Identifier [Axis]: Everbridge, Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (9) [6],[7],[11] (10) [1],[2],[17]                
Investments at fair value $ (8) [6],[7],[11] $ (9) [1],[2],[17]                
Investment, Identifier [Axis]: Everbridge, Inc., Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[11] 5.00% [2],[17] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.29% [6],[8],[11] 10.33% [2],[3],[17] 9.29% [6],[8],[11] 9.29% [6],[8],[11] 9.29% [6],[8],[11] 9.29% [6],[8],[11] 10.33% [2],[3],[17] 10.33% [2],[3],[17]    
Investment, principal $ 19,914 [6],[9],[11] $ 20,014 [2],[5],[17]                
Investment owned, at cost 19,829 [6],[11] 19,914 [2],[17]                
Investments at fair value $ 19,830 [6],[11] $ 19,922 [2],[17]                
Investment, Identifier [Axis]: Everbridge, Inc., Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, interest rate (as a percent) 9.29% [6],[7],[8],[11] 10.30% [1],[2],[3],[17] 9.29% [6],[7],[8],[11] 9.29% [6],[7],[8],[11] 9.29% [6],[7],[8],[11] 9.29% [6],[7],[8],[11] 10.30% [1],[2],[3],[17] 10.30% [1],[2],[3],[17]    
Investment, principal $ 1,951 [6],[7],[9],[11] $ 1,961 [1],[2],[5],[17]                
Investment owned, at cost 1,936 [6],[7],[11] 1,944 [1],[2],[17]                
Investments at fair value $ 1,930 [6],[7],[11] $ 1,950 [1],[2],[17]                
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC, Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% [6],[7],[11] 4.75% [1],[2],[17] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [1],[2],[17] 4.75% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (29) [6],[7],[11] (34) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ (14) [1],[2],[17]                
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC, Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% [6],[11] 4.75% [2],[17] 4.75% [6],[11] 4.75% [6],[11] 4.75% [6],[11] 4.75% [6],[11] 4.75% [2],[17] 4.75% [2],[17]    
Investment, interest rate (as a percent) 9.05% [6],[8],[11] 9.35% [2],[3],[17] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.35% [2],[3],[17] 9.35% [2],[3],[17]    
Investment, principal $ 14,515 [6],[9],[11] $ 14,625 [2],[5],[17]                
Investment owned, at cost 14,243 [6],[11] 14,312 [2],[17]                
Investments at fair value $ 14,515 [6],[11] $ 14,501 [2],[17]                
Investment, Identifier [Axis]: Evergreen IX Borrower 2023, LLC, Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% [6],[11] 4.75% [2],[17] 4.75% [6],[11] 4.75% [6],[11] 4.75% [6],[11] 4.75% [6],[11] 4.75% [2],[17] 4.75% [2],[17]    
Investment, interest rate (as a percent) 9.05% [6],[8],[11] 9.35% [2],[3],[17] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.35% [2],[3],[17] 9.35% [2],[3],[17]    
Investment, principal $ 3,665 [6],[9],[11] $ 3,692 [2],[5],[17]                
Investment owned, at cost 3,633 [6],[11] 3,656 [2],[17]                
Investments at fair value $ 3,665 [6],[11] $ 3,661 [2],[17]                
Investment, Identifier [Axis]: Eyesouth Eye Care Holdco LLC, Health Care Services, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 1,206 [6] 1,206 [2],[21] 1,206 [6] 1,206 [6] 1,206 [6] 1,206 [6] 1,206 [2],[21] 1,206 [2],[21]    
Investment owned, at cost $ 1,206 [6] $ 1,206 [2],[21]                
Investments at fair value $ 1,265 [6] $ 1,131 [2],[21]                
Investment, Identifier [Axis]: Eyesouth Eye Care Holdco LLC, Health Care Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.50% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [2],[17] 5.50% [2],[17]    
Investment, interest rate (as a percent) 9.92% [6],[8],[11] 10.80% [2],[3],[17] 9.92% [6],[8],[11] 9.92% [6],[8],[11] 9.92% [6],[8],[11] 9.92% [6],[8],[11] 10.80% [2],[3],[17] 10.80% [2],[3],[17]    
Investment, principal $ 4,335 [6],[9],[11] $ 4,368 [2],[5],[17]                
Investment owned, at cost 4,268 [6],[11] 4,289 [2],[17]                
Investments at fair value $ 4,275 [6],[11] $ 4,285 [2],[17]                
Investment, Identifier [Axis]: Eyesouth Eye Care Holdco LLC, Health Care Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 9.92%   9.92% 9.92% 9.92% 9.92%        
Investment, principal $ 501 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 445 [6],[7],[11] (66) [1],[2],[17]                
Investments at fair value $ 409 [6],[7],[11] $ (125) [1],[2],[17]                
Investment, Identifier [Axis]: F&M Buyer LLC, Systems Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (10)                  
Investments at fair value [6],[7],[11] $ (10)                  
Investment, Identifier [Axis]: F&M Buyer LLC, Systems Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, interest rate (as a percent) [6],[8],[11] 9.05%   9.05% 9.05% 9.05% 9.05%        
Investment, principal [6],[9],[11] $ 6,703                  
Investment owned, at cost [6],[11] 6,636                  
Investments at fair value [6],[11] $ 6,636                  
Investment, Identifier [Axis]: F&M Buyer LLC, Systems Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (11)                  
Investments at fair value [6],[7],[11] $ (11)                  
Investment, Identifier [Axis]: Fairbridge Strategic Capital Funding LLC, Real Estate Operating Companies, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 9.00% [6],[8] 9.00% [2],[3] 9.00% [6],[8] 9.00% [6],[8] 9.00% [6],[8] 9.00% [6],[8] 9.00% [2],[3] 9.00% [2],[3]    
Investment, principal $ 32,250 [6],[9] $ 48,920 [2],[5]                
Investment owned, at cost 32,250 [6] 48,920 [2]                
Investments at fair value $ 31,605 [6] $ 48,920 [2]                
Investment, Identifier [Axis]: Fairbridge Strategic Capital Funding LLC, Real Estate Operating Companies, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 3,750 [6],[10],[20] 3,750 [2],[13],[22] 3,750 [6],[10],[20] 3,750 [6],[10],[20] 3,750 [6],[10],[20] 3,750 [6],[10],[20] 3,750 [2],[13],[22] 3,750 [2],[13],[22]    
Investment owned, at cost $ 0 [6],[10],[20] $ 0 [2],[13],[22]                
Investments at fair value $ 0 [6],[10],[20] $ 4 [2],[13],[22]                
Investment, Identifier [Axis]: Finastra USA, Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.25% [6],[7],[10],[11] 7.25% [1],[2],[13],[17] 7.25% [6],[7],[10],[11] 7.25% [6],[7],[10],[11] 7.25% [6],[7],[10],[11] 7.25% [6],[7],[10],[11] 7.25% [1],[2],[13],[17] 7.25% [1],[2],[13],[17]    
Investment, interest rate (as a percent) 11.57% [6],[7],[8],[10],[11] 12.18% [1],[2],[3],[13],[17] 11.57% [6],[7],[8],[10],[11] 11.57% [6],[7],[8],[10],[11] 11.57% [6],[7],[8],[10],[11] 11.57% [6],[7],[8],[10],[11] 12.18% [1],[2],[3],[13],[17] 12.18% [1],[2],[3],[13],[17]    
Investment, principal $ 242 [6],[7],[9],[10],[11] $ 564 [1],[2],[5],[13],[17]                
Investment owned, at cost 225 [6],[7],[10],[11] 544 [1],[2],[13],[17]                
Investments at fair value $ 242 [6],[7],[10],[11] $ 547 [1],[2],[13],[17]                
Investment, Identifier [Axis]: Finastra USA, Inc., Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.25% [6],[10],[11] 7.25% [2],[13],[17] 7.25% [6],[10],[11] 7.25% [6],[10],[11] 7.25% [6],[10],[11] 7.25% [6],[10],[11] 7.25% [2],[13],[17] 7.25% [2],[13],[17]    
Investment, interest rate (as a percent) 11.43% [6],[8],[10],[11] 12.18% [2],[3],[13],[17] 11.43% [6],[8],[10],[11] 11.43% [6],[8],[10],[11] 11.43% [6],[8],[10],[11] 11.43% [6],[8],[10],[11] 12.18% [2],[3],[13],[17] 12.18% [2],[3],[13],[17]    
Investment, principal $ 11,595 [6],[9],[10],[11] $ 11,683 [2],[5],[13],[17]                
Investment owned, at cost 11,433 [6],[10],[11] 11,491 [2],[13],[17]                
Investments at fair value 11,595 [6],[10],[11] $ 11,521 [2],[13],[17]                
Investment, Identifier [Axis]: Finthrive Software Intermediate Holdings, Inc., Health Care Technology, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent) [2],[3],[17]   8.96%         8.96% 8.96%    
Investment, principal [2],[5],[17]   $ 4,291                
Investment owned, at cost [2],[17]   3,594                
Investments at fair value [2],[17]   $ 3,862                
Investment, Identifier [Axis]: Finthrive Software Intermediate Holdings, Inc., Health Care Technology, Second Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[16],[17]   6.75%         6.75% 6.75%    
Investment, principal [2],[5],[16],[17]   $ 31,074                
Investment owned, at cost [2],[16],[17]   28,328                
Investments at fair value [2],[16],[17]   23,616                
Investment, Identifier [Axis]: First Star Speir Aviation Limited, Airlines, Equity Interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investments at fair value                 0 0
Investment, Identifier [Axis]: Five Largest Loan Exposures To Borrowers | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal 49,904 49,413                
Investment, Identifier [Axis]: Five Largest Loan Exposures To Borrowers | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal $ 20,426 $ 22,152                
Investment, Identifier [Axis]: Fortress Biotech, Inc., Biotechnology, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 31,246 [6],[10] 27,801 [2],[13] 31,246 [6],[10] 31,246 [6],[10] 31,246 [6],[10] 31,246 [6],[10] 27,801 [2],[13] 27,801 [2],[13]    
Investment owned, at cost $ 427 [6],[10] $ 427 [2],[13]                
Investments at fair value $ 16 [6],[10] $ 13 [2],[13]                
Investment, Identifier [Axis]: Fortress Credit BSL Limited, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [10],[11] 8.19%   8.19% 8.19% 8.19% 8.19%        
Investment, interest rate (as a percent) [8],[10],[11] 12.46%   12.46% 12.46% 12.46% 12.46%        
Investment, principal [9],[10],[11] $ 1,550                  
Investment owned, at cost [10],[11] 1,558                  
Investments at fair value [10],[11] $ 1,533                  
Investment, Identifier [Axis]: Frontier Communications Holdings, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 2.50% 3.50% 2.50% 2.50% 2.50% 2.50% 3.50% 3.50%    
Investment, interest rate (as a percent) 6.79% 8.76% 6.79% 6.79% 6.79% 6.79% 8.76% 8.76%    
Investment, principal $ 6,965 $ 7,000                
Investment owned, at cost 6,933 6,965                
Investments at fair value $ 6,977 $ 7,061                
Investment, Identifier [Axis]: Frontier Communications Holdings, LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.50%         3.50% 3.50%    
Investment, interest rate (as a percent)   8.76%         8.76% 8.76%    
Investment, principal   $ 3,000                
Investment owned, at cost   2,985                
Investments at fair value   $ 3,026                
Investment, Identifier [Axis]: Frontier Communications Holdings, LLC, First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 2.50%   2.50% 2.50% 2.50% 2.50%        
Investment, interest rate (as a percent) 6.79%   6.79% 6.79% 6.79% 6.79%        
Investment, principal $ 2,985                  
Investment owned, at cost 2,971                  
Investments at fair value $ 2,990                  
Investment, Identifier [Axis]: GLICK JV Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50%   4.50% 4.50% 4.50% 4.50%        
Investment, Identifier [Axis]: Galileo Parent, Inc., Aerospace & Defense, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[7],[11] 7.25% [1],[2],[17] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 7.25% [1],[2],[17] 7.25% [1],[2],[17]    
Investment, interest rate (as a percent) 10.05% [6],[7],[8],[11] 11.85% [1],[2],[3],[17] 10.05% [6],[7],[8],[11] 10.05% [6],[7],[8],[11] 10.05% [6],[7],[8],[11] 10.05% [6],[7],[8],[11] 11.85% [1],[2],[3],[17] 11.85% [1],[2],[3],[17]    
Investment, principal $ 3,990 [6],[7],[9],[11] $ 2,536 [1],[2],[5],[17]                
Investment owned, at cost 3,963 [6],[7],[11] 2,452 [1],[2],[17]                
Investments at fair value $ 3,951 [6],[7],[11] $ 2,536 [1],[2],[17]                
Investment, Identifier [Axis]: Galileo Parent, Inc., Aerospace & Defense, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[11] 7.25% [2],[17] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 7.25% [2],[17] 7.25% [2],[17]    
Investment, interest rate (as a percent) 10.05% [6],[8],[11] 11.85% [2],[3],[17] 10.05% [6],[8],[11] 10.05% [6],[8],[11] 10.05% [6],[8],[11] 10.05% [6],[8],[11] 11.85% [2],[3],[17] 11.85% [2],[3],[17]    
Investment, principal $ 38,351 [6],[9],[11] $ 23,536 [2],[5],[17]                
Investment owned, at cost 37,867 [6],[11] 22,996 [2],[17]                
Investments at fair value $ 38,102 [6],[11] $ 23,536 [2],[17]                
Investment, Identifier [Axis]: Grand River Aseptic Manufacturing, Inc., Health Care Equipment, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (25)                  
Investments at fair value [6],[7],[11] $ (25)                  
Investment, Identifier [Axis]: Grand River Aseptic Manufacturing, Inc., Health Care Equipment, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[11] 9.31%   9.31% 9.31% 9.31% 9.31%        
Investment, principal [6],[9],[11] $ 8,432                  
Investment owned, at cost [6],[11] 8,352                  
Investments at fair value [6],[11] $ 8,352                  
Investment, Identifier [Axis]: Grove Hotel Parcel Owner, LLC, Hotels, Resorts & Cruise Lines, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.00% [6],[7],[11] 8.00% [1],[2],[17] 8.00% [6],[7],[11] 8.00% [6],[7],[11] 8.00% [6],[7],[11] 8.00% [6],[7],[11] 8.00% [1],[2],[17] 8.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (14) [6],[7],[11] (20) [1],[2],[17]                
Investments at fair value $ (32) [6],[7],[11] $ (35) [1],[2],[17]                
Investment, Identifier [Axis]: Grove Hotel Parcel Owner, LLC, Hotels, Resorts & Cruise Lines, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.00% [6],[11] 8.00% [2],[17] 8.00% [6],[11] 8.00% [6],[11] 8.00% [6],[11] 8.00% [6],[11] 8.00% [2],[17] 8.00% [2],[17]    
Investment, interest rate (as a percent) 12.43% [6],[8],[11] 12.95% [2],[3],[17] 12.43% [6],[8],[11] 12.43% [6],[8],[11] 12.43% [6],[8],[11] 12.43% [6],[8],[11] 12.95% [2],[3],[17] 12.95% [2],[3],[17]    
Investment, principal $ 3,524 [6],[9],[11] $ 3,524 [2],[5],[17]                
Investment owned, at cost 3,495 [6],[11] 3,485 [2],[17]                
Investments at fair value $ 3,461 [6],[11] $ 3,454 [2],[17]                
Investment, Identifier [Axis]: Grove Hotel Parcel Owner, LLC, Hotels, Resorts & Cruise Lines, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.00% [6],[11] 8.00% [1],[2],[17] 8.00% [6],[11] 8.00% [6],[11] 8.00% [6],[11] 8.00% [6],[11] 8.00% [1],[2],[17] 8.00% [1],[2],[17]    
Investment, interest rate (as a percent) 12.43% [6],[8],[11] 12.95% [1],[2],[3],[17] 12.43% [6],[8],[11] 12.43% [6],[8],[11] 12.43% [6],[8],[11] 12.43% [6],[8],[11] 12.95% [1],[2],[3],[17] 12.95% [1],[2],[3],[17]    
Investment, principal $ 17,136 [6],[9],[11] $ 17,268 [2],[5],[17]                
Investment owned, at cost 17,049 [6],[11] 17,147 [2],[17]                
Investments at fair value $ 16,828 [6],[11] $ 16,923 [2],[17]                
Investment, Identifier [Axis]: HPS Loan Management 10-2016, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [13],[17]   6.67%         6.67% 6.67%    
Investment, interest rate (as a percent) [3],[13],[17]   11.95%         11.95% 11.95%    
Investment, principal [5],[13],[17]   $ 2,250                
Investment owned, at cost [13],[17]   2,136                
Investments at fair value [13],[17]   $ 2,264                
Investment, Identifier [Axis]: Harbor Purchaser Inc., Education Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [11] 5.25% [17] 5.25% [11] 5.25% [11] 5.25% [11] 5.25% [11] 5.25% [17] 5.25% [17]    
Investment, interest rate (as a percent) 9.63% [8],[11] 10.20% [3],[17] 9.63% [8],[11] 9.63% [8],[11] 9.63% [8],[11] 9.63% [8],[11] 10.20% [3],[17] 10.20% [3],[17]    
Investment, principal $ 8,408 [9],[11] $ 8,473 [5],[17]                
Investment owned, at cost 8,186 [11] 8,205 [17]                
Investments at fair value $ 8,265 [11] $ 8,263 [17]                
Investment, Identifier [Axis]: Harbor Purchaser Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%    
Investment, interest rate (as a percent) 9.63% 10.20% 9.63% 9.63% 9.63% 9.63% 10.20% 10.20%    
Investment, principal $ 7,780 $ 7,840                
Investment owned, at cost 7,653 7,687                
Investments at fair value $ 7,648 $ 7,646                
Investment, Identifier [Axis]: Harbor Purchaser Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%    
Investment, interest rate (as a percent) 9.63% 10.20% 9.63% 9.63% 9.63% 9.63% 10.20% 10.20%    
Investment, principal $ 3,890 $ 3,920                
Investment owned, at cost 3,826 3,843                
Investments at fair value $ 3,824 $ 3,823                
Investment, Identifier [Axis]: Harrow, Inc., Pharmaceuticals, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% [6],[10],[11] 6.50% [1],[2],[13],[17] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [1],[2],[13],[17] 6.50% [1],[2],[13],[17]    
Investment, interest rate (as a percent) [6],[8],[10],[11] 10.95%   10.95% 10.95% 10.95% 10.95%        
Investment, principal $ 3,438 [6],[9],[10],[11] $ 0 [1],[2],[5],[13],[17]                
Investment owned, at cost 3,421 [6],[10],[11] (40) [1],[2],[13],[17]                
Investments at fair value $ 3,489 [6],[10],[11] $ 52 [1],[2],[13],[17]                
Investment, Identifier [Axis]: Harrow, Inc., Pharmaceuticals, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% [6],[10],[11] 6.50% [2],[13],[17] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [2],[13],[17] 6.50% [2],[13],[17]    
Investment, interest rate (as a percent) 10.95% [6],[8],[10],[11] 11.25% [2],[3],[13],[17] 10.95% [6],[8],[10],[11] 10.95% [6],[8],[10],[11] 10.95% [6],[8],[10],[11] 10.95% [6],[8],[10],[11] 11.25% [2],[3],[13],[17] 11.25% [2],[3],[13],[17]    
Investment, principal $ 1,432 [6],[9],[10],[11] $ 1,432 [2],[5],[13],[17]                
Investment owned, at cost 1,424 [6],[10],[11] 1,413 [2],[13],[17]                
Investments at fair value $ 1,454 [6],[10],[11] $ 1,454 [2],[13],[17]                
Investment, Identifier [Axis]: Harrow, Inc., Pharmaceuticals, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% [6],[10],[11] 6.50% [2],[13],[17] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [6],[10],[11] 6.50% [2],[13],[17] 6.50% [2],[13],[17]    
Investment, interest rate (as a percent) 10.95% [6],[8],[10],[11] 11.25% [2],[3],[13],[17] 10.95% [6],[8],[10],[11] 10.95% [6],[8],[10],[11] 10.95% [6],[8],[10],[11] 10.95% [6],[8],[10],[11] 11.25% [2],[3],[13],[17] 11.25% [2],[3],[13],[17]    
Investment, principal $ 7,448 [6],[9],[10],[11] $ 7,448 [2],[5],[13],[17]                
Investment owned, at cost 7,411 [6],[10],[11] 7,362 [2],[13],[17]                
Investments at fair value $ 7,560 [6],[10],[11] $ 7,560 [2],[13],[17]                
Investment, Identifier [Axis]: Husky Injection Molding Systems Ltd., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50%   4.50% 4.50% 4.50% 4.50%        
Investment, interest rate (as a percent) 8.80%   8.80% 8.80% 8.80% 8.80%        
Investment, principal $ 8,800                  
Investment owned, at cost 8,750                  
Investments at fair value $ 8,834                  
Investment, Identifier [Axis]: Husky Injection Molding Systems Ltd., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% 5.00% 4.50% 4.50% 4.50% 4.50% 5.00% 5.00%    
Investment, interest rate (as a percent) 8.80% 10.33% 8.80% 8.80% 8.80% 8.80% 10.33% 10.33%    
Investment, principal $ 4,316 $ 3,125                
Investment owned, at cost 4,286 3,088                
Investments at fair value $ 4,332 $ 3,114                
Investment, Identifier [Axis]: Husky Injection Molding Systems Ltd.,First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent)   10.33%         10.33% 10.33%    
Investment, principal   $ 5,089                
Investment owned, at cost   5,028                
Investments at fair value   $ 5,071                
Investment, Identifier [Axis]: IAMGOLD Corporation, Gold, Second Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.25% [6],[10],[11] 8.25% [2],[13],[17] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [2],[13],[17] 8.25% [2],[13],[17]    
Investment, interest rate (as a percent) 12.56% [6],[8],[10],[11] 13.37% [2],[3],[13],[17] 12.56% [6],[8],[10],[11] 12.56% [6],[8],[10],[11] 12.56% [6],[8],[10],[11] 12.56% [6],[8],[10],[11] 13.37% [2],[3],[13],[17] 13.37% [2],[3],[13],[17]    
Investment, principal $ 23,975 [6],[9],[10],[11] $ 23,975 [2],[5],[13],[17]                
Investment owned, at cost 23,562 [6],[10],[11] 23,454 [2],[13],[17]                
Investments at fair value $ 24,867 [6],[10],[11] $ 25,054 [2],[13],[17]                
Investment, Identifier [Axis]: INW Manufacturing, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment, interest rate (as a percent) 10.31% 10.62% 10.31% 10.31% 10.31% 10.31% 10.62% 10.62%    
Investment, principal $ 8,125 $ 8,500                
Investment owned, at cost 8,053 8,392                
Investments at fair value $ 7,427 $ 7,140                
Investment, Identifier [Axis]: INW Manufacturing, LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment, interest rate (as a percent) 10.31% 10.62% 10.31% 10.31% 10.31% 10.31% 10.62% 10.62%    
Investment, principal $ 2,031 $ 2,125                
Investment owned, at cost 2,013 2,098                
Investments at fair value $ 1,857 $ 1,785                
Investment, Identifier [Axis]: INW Manufacturing, LLC, Personal Care Products, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [11] 5.75% [17] 5.75% [11] 5.75% [11] 5.75% [11] 5.75% [11] 5.75% [17] 5.75% [17]    
Investment, interest rate (as a percent) 10.31% [8],[11] 10.62% [3],[17] 10.31% [8],[11] 10.31% [8],[11] 10.31% [8],[11] 10.31% [8],[11] 10.62% [3],[17] 10.62% [3],[17]    
Investment, principal $ 40,219 [9],[11] $ 42,075 [5],[17]                
Investment owned, at cost 39,486 [11] 40,978 [17]                
Investments at fair value $ 36,763 [11] $ 35,343 [17]                
Investment, Identifier [Axis]: IPC Corp., Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% [6],[11] 6.50% [2],[17] 6.50% [6],[11] 6.50% [6],[11] 6.50% [6],[11] 6.50% [6],[11] 6.50% [2],[17] 6.50% [2],[17]    
Investment, interest rate (as a percent) 9.93% [6],[8],[11] 11.97% [2],[3],[17] 9.93% [6],[8],[11] 9.93% [6],[8],[11] 9.93% [6],[8],[11] 9.93% [6],[8],[11] 11.97% [2],[3],[17] 11.97% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) [6],[11] 1.00%   1.00% 1.00% 1.00% 1.00%        
Investment, principal $ 36,262 [6],[9],[11] $ 36,029 [2],[5],[17]                
Investment owned, at cost 36,021 [6],[11] 35,643 [2],[17]                
Investments at fair value $ 35,265 [6],[11] $ 35,668 [2],[17]                
Investment, Identifier [Axis]: IVCE US LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75%   3.75% 3.75% 3.75% 3.75%        
Investment, interest rate (as a percent) 8.05%   8.05% 8.05% 8.05% 8.05%        
Investment, principal $ 4,975                  
Investment owned, at cost 4,998                  
Investments at fair value $ 5,007                  
Investment, Identifier [Axis]: Icefall Parent, Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[7],[11] 6.50% [1],[2],[17] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 6.50% [1],[2],[17] 6.50% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (15) [6],[7],[11] (18) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ (7) [1],[2],[17]                
Investment, Identifier [Axis]: Icefall Parent, Inc., Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[11] 6.50% [2],[17] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 6.50% [2],[17] 6.50% [2],[17]    
Investment, interest rate (as a percent) 10.03% [6],[8],[11] 11.35% [2],[3],[17] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 11.35% [2],[3],[17] 11.35% [2],[3],[17]    
Investment, principal $ 10,446 [6],[9],[11] $ 10,446 [2],[5],[17]                
Investment owned, at cost 10,287 [6],[11] 10,261 [2],[17]                
Investments at fair value $ 10,446 [6],[11] $ 10,372 [2],[17]                
Investment, Identifier [Axis]: Indivior Finance S.À.R.L., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.25%         5.25% 5.25%    
Investment, interest rate (as a percent)   10.21%         10.21% 10.21%    
Investment, principal   $ 7,256                
Investment owned, at cost   7,205                
Investments at fair value   $ 7,247                
Investment, Identifier [Axis]: Indivior Finance S.À.R.L., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.25%         5.25% 5.25%    
Investment, interest rate (as a percent)   10.21%         10.21% 10.21%    
Investment, principal   $ 3,870                
Investment owned, at cost   3,842                
Investments at fair value   $ 3,865                
Investment, Identifier [Axis]: Inmar Inc, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50%   4.50% 4.50% 4.50% 4.50%        
Investment, interest rate (as a percent) 8.80%   8.80% 8.80% 8.80% 8.80%        
Investment, principal $ 4,975                  
Investment owned, at cost 4,987                  
Investments at fair value $ 5,023                  
Investment, Identifier [Axis]: Inmar Inc, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50%   4.50% 4.50% 4.50% 4.50%        
Investment, interest rate (as a percent) 8.80%   8.80% 8.80% 8.80% 8.80%        
Investment, principal $ 1,990                  
Investment owned, at cost 1,995                  
Investments at fair value $ 2,009                  
Investment, Identifier [Axis]: Innocoll Pharmaceuticals Limited, Health Care Technology, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [2],[13]   112,990         112,990 112,990    
Investment owned, at cost [2],[13]   $ 300                
Investments at fair value [2],[13]   $ 0                
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Insurance Brokers, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (20) [6],[7],[11] (25) [1],[2],[17]                
Investments at fair value $ (5) [6],[7],[11] $ (26) [1],[2],[17]                
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Insurance Brokers, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[11] 5.00% [2],[17] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.33% [6],[8],[11] 10.08% [2],[3],[17] 9.33% [6],[8],[11] 9.33% [6],[8],[11] 9.33% [6],[8],[11] 9.33% [6],[8],[11] 10.08% [2],[3],[17] 10.08% [2],[3],[17]    
Investment, principal $ 26,120 [6],[9],[11] $ 19,559 [2],[5],[17]                
Investment owned, at cost 25,967 [6],[11] 19,368 [2],[17]                
Investments at fair value $ 26,068 [6],[11] $ 19,363 [2],[17]                
Investment, Identifier [Axis]: Integrity Marketing Acquisition, LLC, Insurance Brokers, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost (54) [6],[7],[11] $ (68) [1],[2],[17]                
Investments at fair value $ (14) [6],[7],[11] $ (66) [1],[2],[17]                
Investment, Identifier [Axis]: Inventus Power, Inc., Electrical Components & Equipment, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% [6],[7],[11] 7.50% [1],[2],[17] 7.50% [6],[7],[11] 7.50% [6],[7],[11] 7.50% [6],[7],[11] 7.50% [6],[7],[11] 7.50% [1],[2],[17] 7.50% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 11.93%   11.93% 11.93% 11.93% 11.93%        
Investment, principal $ 632 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 608 [6],[7],[11] (42) [1],[2],[17]                
Investments at fair value $ 575 [6],[7],[11] $ (86) [1],[2],[17]                
Investment, Identifier [Axis]: Inventus Power, Inc., Electrical Components & Equipment, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% [6],[11] 7.50% [2],[17] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 7.50% [2],[17] 7.50% [2],[17]    
Investment, interest rate (as a percent) 11.94% [6],[8],[11] 12.46% [2],[3],[17] 11.94% [6],[8],[11] 11.94% [6],[8],[11] 11.94% [6],[8],[11] 11.94% [6],[8],[11] 12.46% [2],[3],[17] 12.46% [2],[3],[17]    
Investment, principal $ 32,828 [6],[9],[11] $ 33,079 [2],[5],[17]                
Investment owned, at cost 32,784 [6],[11] 32,876 [2],[17]                
Investments at fair value 32,336 [6],[11] 32,332 [2],[17]                
Investment, Identifier [Axis]: JN Bidco LLC, Health Care Technology, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, at cost 9,179 [6] 9,886 [2]                
Investments at fair value 18,982 [6] 9,886 [2]                
Investment, Identifier [Axis]: JP Morgan Prime Money Market Fund, Institutional Shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, at cost 19,679 34,597                
Investments at fair value $ 19,679 $ 34,597                
Investment, Identifier [Axis]: KDC US Holdings, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) 8.33%   8.33% 8.33% 8.33% 8.33%        
Investment, principal $ 8,890                  
Investment owned, at cost 8,714                  
Investments at fair value $ 8,911                  
Investment, Identifier [Axis]: KDC US Holdings, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.50%         4.50% 4.50%    
Investment, interest rate (as a percent)   9.36%         9.36% 9.36%    
Investment, principal   $ 3,551                
Investment owned, at cost   3,454                
Investments at fair value   $ 3,558                
Investment, Identifier [Axis]: KDC/ONE Development Corp Inc, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.50%         4.50% 4.50%    
Investment, interest rate (as a percent)   9.36%         9.36% 9.36%    
Investment, principal   $ 8,890                
Investment owned, at cost   8,675                
Investments at fair value   $ 8,908                
Investment, Identifier [Axis]: KDC/ONE Development Corp Inc, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) 8.33%   8.33% 8.33% 8.33% 8.33%        
Investment, principal $ 3,551                  
Investment owned, at cost 3,473                  
Investments at fair value $ 3,559                  
Investment, Identifier [Axis]: KKR Financial CLO Ltd, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [10],[11] 7.10%   7.10% 7.10% 7.10% 7.10%        
Investment, interest rate (as a percent) [8],[10],[11] 11.36%   11.36% 11.36% 11.36% 11.36%        
Investment, principal [9],[10],[11] $ 2,000                  
Investment owned, at cost [10],[11] 2,057                  
Investments at fair value [10],[11] $ 2,006                  
Investment, Identifier [Axis]: Kaseya Inc., Systems Software, Second Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [8],[11] 9.33%   9.33% 9.33% 9.33% 9.33%        
Investment, principal [9],[11] $ 10,876                  
Investment owned, at cost [11] 10,822                  
Investments at fair value [11] $ 10,915                  
Investment, Identifier [Axis]: Kidde Global Services, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.57%   8.57% 8.57% 8.57% 8.57%        
Investment, principal $ 1,213                  
Investment owned, at cost 1,201                  
Investments at fair value $ 1,221                  
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) [6],[7],[8],[11] 11.75%   11.75% 11.75% 11.75% 11.75%        
Investment, principal [6],[7],[9],[11] $ 2,911                  
Investment owned, at cost [6],[7],[11] 2,829                  
Investments at fair value [6],[7],[11] $ 2,554                  
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Revolver 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent) [1],[2],[3],[17]   12.50%         12.50% 12.50%    
Investment, principal [1],[2],[5],[17]   $ 1,259                
Investment owned, at cost [1],[2],[17]   1,223                
Investments at fair value [1],[2],[17]   $ 1,216                
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Revolver 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent) [1],[2],[3],[17]   12.00%         12.00% 12.00%    
Investment, principal [1],[2],[5],[17]   $ 926                
Investment owned, at cost [1],[2],[17]   901                
Investments at fair value [1],[2],[17]   $ 894                
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[11] 5.00% [2],[17] 5.25% [6],[11] 5.25% [6],[11] 5.25% [6],[11] 5.25% [6],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.65% [6],[8],[11] 9.95% [2],[3],[17] 9.65% [6],[8],[11] 9.65% [6],[8],[11] 9.65% [6],[8],[11] 9.65% [6],[8],[11] 9.95% [2],[3],[17] 9.95% [2],[3],[17]    
Investment, principal $ 37,445 [6],[9],[11] $ 37,635 [2],[5],[17]                
Investment owned, at cost 37,125 [6],[11] 37,211 [2],[17]                
Investments at fair value $ 35,838 [6],[11] $ 37,123 [2],[17]                
Investment, Identifier [Axis]: Kings Buyer, LLC, Environmental & Facilities Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[11] 5.00% [2],[17] 5.25% [6],[11] 5.25% [6],[11] 5.25% [6],[11] 5.25% [6],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.65% [6],[8],[11] 10.68% [2],[3],[17] 9.65% [6],[8],[11] 9.65% [6],[8],[11] 9.65% [6],[8],[11] 9.65% [6],[8],[11] 10.68% [2],[3],[17] 10.68% [2],[3],[17]    
Investment, principal $ 16,467 [6],[9],[11] $ 16,552 [2],[5],[17]                
Investment owned, at cost 16,417 [6],[11] 16,423 [2],[17]                
Investments at fair value $ 15,760 [6],[11] $ 16,327 [2],[17]                
Investment, Identifier [Axis]: Kite Midco II Inc., Research & Consulting Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[11] 9.27%   9.27% 9.27% 9.27% 9.27%        
Investment, principal [6],[9],[11] $ 9,644                  
Investment owned, at cost [6],[11] 9,511                  
Investments at fair value [6],[11] $ 9,503                  
Investment, Identifier [Axis]: Kite Midco II Inc., Research & Consulting Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (16)                  
Investments at fair value [6],[7],[11] $ (17)                  
Investment, Identifier [Axis]: LABL, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%    
Investment, interest rate (as a percent) 9.43% 9.95% 9.43% 9.43% 9.43% 9.43% 9.95% 9.95%    
Investment, principal $ 5,251 $ 7,896                
Investment owned, at cost 5,143 7,682                
Investments at fair value $ 4,751 $ 7,734                
Investment, Identifier [Axis]: LABL, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%    
Investment, interest rate (as a percent) 9.43% 9.95% 9.43% 9.43% 9.43% 9.43% 9.95% 9.95%    
Investment, principal $ 1,987 $ 2,987                
Investment owned, at cost 1,931 2,899                
Investments at fair value $ 1,797 $ 2,926                
Investment, Identifier [Axis]: LABL, Inc., Office Services & Supplies, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [11] 5.00% [17] 5.00% [11] 5.00% [11] 5.00% [11] 5.00% [11] 5.00% [17] 5.00% [17]    
Investment, interest rate (as a percent) 9.43% [8],[11] 9.95% [3],[17] 9.43% [8],[11] 9.43% [8],[11] 9.43% [8],[11] 9.43% [8],[11] 9.95% [3],[17] 9.95% [3],[17]    
Investment, principal $ 12,876 [9],[11] $ 19,351 [5],[17]                
Investment owned, at cost 12,625 [11] 18,861 [17]                
Investments at fair value $ 11,645 [11] $ 18,953 [17]                
Investment, Identifier [Axis]: LDS Buyer, LLC, Air Freight & Logistics, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (24)                  
Investments at fair value [6],[7],[11] $ (24)                  
Investment, Identifier [Axis]: LDS Buyer, LLC, Air Freight & Logistics, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[11] 9.33%   9.33% 9.33% 9.33% 9.33%        
Investment, principal [6],[9],[11] $ 13,869                  
Investment owned, at cost [6],[11] 13,705                  
Investments at fair value [6],[11] $ 13,708                  
Investment, Identifier [Axis]: LDS Buyer, LLC, Air Freight & Logistics, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (16)                  
Investments at fair value [6],[7],[11] $ (16)                  
Investment, Identifier [Axis]: LSF12 Crown US Commercial Bidco, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.57%   8.57% 8.57% 8.57% 8.57%        
Investment, principal $ 4,962                  
Investment owned, at cost 4,912                  
Investments at fair value $ 4,995                  
Investment, Identifier [Axis]: LSL Holdco, LLC, Health Care Distributors, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [1],[2],[17]    
Investment, interest rate (as a percent) 10.43% [6],[7],[8],[11] 10.95% [1],[2],[3],[17] 10.43% [6],[7],[8],[11] 10.43% [6],[7],[8],[11] 10.43% [6],[7],[8],[11] 10.43% [6],[7],[8],[11] 10.95% [1],[2],[3],[17] 10.95% [1],[2],[3],[17]    
Investment, principal $ 2,226 [6],[7],[9],[11] $ 2,014 [1],[2],[5],[17]                
Investment owned, at cost 2,202 [6],[7],[11] 1,982 [1],[2],[17]                
Investments at fair value $ 2,107 [6],[7],[11] $ 1,849 [1],[2],[17]                
Investment, Identifier [Axis]: LSL Holdco, LLC, Health Care Distributors, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[11] 6.00% [2],[17] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 10.43% [6],[8],[11] 10.95% [2],[3],[17] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.95% [2],[3],[17] 10.95% [2],[3],[17]    
Investment, principal $ 2,687 [6],[9],[11] $ 2,708 [2],[5],[17]                
Investment owned, at cost 2,605 [6],[11] 2,601 [2],[17]                
Investments at fair value $ 2,566 [6],[11] $ 2,539 [2],[17]                
Investment, Identifier [Axis]: LSL Holdco, LLC, Health Care Distributors, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[11] 6.00% [2],[17] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 10.43% [6],[8],[11] 10.95% [2],[3],[17] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.95% [2],[3],[17] 10.95% [2],[3],[17]    
Investment, principal $ 23,077 [6],[9],[11] $ 23,256 [2],[5],[17]                
Investment owned, at cost 22,863 [6],[11] 22,977 [2],[17]                
Investments at fair value $ 22,038 [6],[11] $ 21,802 [2],[17]                
Investment, Identifier [Axis]: LTI Holdings, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25% 4.75% 4.25% 4.25% 4.25% 4.25% 4.75% 4.75%    
Investment, interest rate (as a percent) 8.58% 9.60% 8.58% 8.58% 8.58% 8.58% 9.60% 9.60%    
Investment, principal $ 9,925 $ 10,000                
Investment owned, at cost 9,821 9,876                
Investments at fair value 9,936 $ 9,848                
Investment, Identifier [Axis]: LTI Holdings, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.75%         4.75% 4.75%    
Investment, interest rate (as a percent)   9.60%         9.60% 9.60%    
Investment, principal   $ 4,000                
Investment owned, at cost   3,950                
Investments at fair value   3,939                
Investment, Identifier [Axis]: Largest Exposure To A Single Borrower | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal 10,416 10,495                
Investment, Identifier [Axis]: Largest Loan Exposure To A Single Borrower | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal $ 4,316 $ 5,898                
Investment, Identifier [Axis]: LaserAway Intermediate Holdings II, LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.25%   4.25% 4.25% 4.25% 4.25%        
Investment, interest rate (as a percent) 8.58%   8.58% 8.58% 8.58% 8.58%        
Investment, principal $ 3,970                  
Investment owned, at cost 3,928                  
Investments at fair value $ 3,974                  
Investment, Identifier [Axis]: Latam Airlines Group S.A., Passenger Airlines, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [13],[17]   9.50%         9.50% 9.50%    
Investment, interest rate (as a percent) [3],[13],[17]   14.95%         14.95% 14.95%    
Investment, principal [5],[13],[17]   $ 26,156                
Investment owned, at cost [13],[17]   25,039                
Investments at fair value [13],[17]   $ 26,556                
Investment, Identifier [Axis]: Learfield Communications, LLC, Movies & Entertainment, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% [11] 5.50% [17] 4.50% [11] 4.50% [11] 4.50% [11] 4.50% [11] 5.50% [17] 5.50% [17]    
Investment, interest rate (as a percent) 8.83% [8],[11] 10.35% [3],[17] 8.83% [8],[11] 8.83% [8],[11] 8.83% [8],[11] 8.83% [8],[11] 10.35% [3],[17] 10.35% [3],[17]    
Investment, principal $ 23,841 [9],[11] $ 30,856 [5],[17]                
Investment owned, at cost 23,792 [11] 30,779 [17]                
Investments at fair value $ 24,050 [11] $ 30,863 [17]                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, Specialized Consumer Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 9.32%   9.32% 9.32% 9.32% 9.32%        
Investment, principal $ 1,240 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 1,187 [6],[7],[11] (61) [1],[2],[17]                
Investments at fair value $ 1,188 [6],[7],[11] $ (60) [1],[2],[17]                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, Specialized Consumer Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.00% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 7.07% [6],[8],[11] 10.13% [2],[3],[17] 7.07% [6],[8],[11] 7.07% [6],[8],[11] 7.07% [6],[8],[11] 7.07% [6],[8],[11] 10.13% [2],[3],[17] 10.13% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) [6],[11] 2.75%   2.75% 2.75% 2.75% 2.75%        
Investment, principal $ 26,779 [6],[9],[11] $ 26,358 [2],[5],[17]                
Investment owned, at cost 26,319 [6],[11] 25,839 [2],[17]                
Investments at fair value $ 26,324 [6],[11] $ 25,847 [2],[17]                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, Specialized Consumer Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.00% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (14) [6],[7],[11] (15) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ (15) [1],[2],[17]                
Investment, Identifier [Axis]: Lightbox Intermediate, L.P., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   5.00%         5.00% 5.00%    
Investment, interest rate (as a percent)   9.96%         9.96% 9.96%    
Investment, principal   $ 29                
Investment owned, at cost   29                
Investments at fair value   $ 28                
Investment, Identifier [Axis]: Lightbox Intermediate, L.P., Real Estate Services, First Lien Rvolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.50%   5.50% 5.50% 5.50% 5.50%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (17)                  
Investments at fair value [6],[7],[11] $ (18)                  
Investment, Identifier [Axis]: Lightbox Intermediate, L.P., Real Estate Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.00% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.74% [6],[8],[11] 9.96% [2],[3],[17] 9.74% [6],[8],[11] 9.74% [6],[8],[11] 9.74% [6],[8],[11] 9.74% [6],[8],[11] 9.96% [2],[3],[17] 9.96% [2],[3],[17]    
Investment, principal $ 19,607 [6],[9],[11] $ 55,873 [2],[5],[17]                
Investment owned, at cost 19,340 [6],[11] 55,220 [2],[17]                
Investments at fair value $ 19,332 [6],[11] $ 54,197 [2],[17]                
Investment, Identifier [Axis]: Liquid Environmental Solutions Corporation, Environmental & Facilities Services, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 559 [6] 559 [2] 559 [6] 559 [6] 559 [6] 559 [6] 559 [2] 559 [2]    
Investment owned, at cost $ 563 [6] $ 563 [2]                
Investments at fair value $ 0 [6] $ 64 [2]                
Investment, Identifier [Axis]: Liquid Environmental Solutions Corporation, Environmental & Facilities Services, Second Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.50% [6],[11] 8.50% [2],[17] 8.50% [6],[11] 8.50% [6],[11] 8.50% [6],[11] 8.50% [6],[11] 8.50% [2],[17] 8.50% [2],[17]    
Investment, interest rate (as a percent) 12.88% [6],[8],[11] 13.20% [2],[3],[17] 12.88% [6],[8],[11] 12.88% [6],[8],[11] 12.88% [6],[8],[11] 12.88% [6],[8],[11] 13.20% [2],[3],[17] 13.20% [2],[3],[17]    
Investment, principal $ 3,167 [6],[9],[11] $ 3,167 [2],[5],[17]                
Investment owned, at cost 3,122 [6],[11] 3,123 [2],[17]                
Investments at fair value $ 2,993 [6],[11] $ 2,993 [2],[17]                
Investment, Identifier [Axis]: Liquid Environmental Solutions Corporation, Environmental & Facilities Services, Second Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.50% [6],[11] 8.50% [2],[17] 8.50% [6],[11] 8.50% [6],[11] 8.50% [6],[11] 8.50% [6],[11] 8.50% [2],[17] 8.50% [2],[17]    
Investment, interest rate (as a percent) 12.88% [6],[8],[11] 13.20% [2],[3],[17] 12.88% [6],[8],[11] 12.88% [6],[8],[11] 12.88% [6],[8],[11] 12.88% [6],[8],[11] 13.20% [2],[3],[17] 13.20% [2],[3],[17]    
Investment, principal $ 5,822 [6],[9],[11] $ 5,822 [2],[5],[17]                
Investment owned, at cost 5,798 [6],[11] 5,785 [2],[17]                
Investments at fair value $ 5,502 [6],[11] $ 5,502 [2],[17]                
Investment, Identifier [Axis]: Liquid Environmental Solutions Corporation, Environmental & Facilities Services, Second Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 8.50%   8.50% 8.50% 8.50% 8.50%        
Investment, interest rate (as a percent) [6],[8],[11] 12.88%   12.88% 12.88% 12.88% 12.88%        
Investment, principal [6],[9],[11] $ 504                  
Investment owned, at cost [6],[11] 500                  
Investments at fair value [6],[11] $ 477                  
Investment, Identifier [Axis]: M2S Group Intermediate Holdings Inc, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75%    
Investment, interest rate (as a percent) 9.03% 9.85% 9.03% 9.03% 9.03% 9.03% 9.85% 9.85%    
Investment, principal $ 9,540 $ 10,000                
Investment owned, at cost 9,244 9,652                
Investments at fair value $ 9,260 $ 9,625                
Investment, Identifier [Axis]: M2S Group Intermediate Holdings Inc, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75% 4.75%    
Investment, interest rate (as a percent) 9.03% 9.85% 9.03% 9.03% 9.03% 9.03% 9.85% 9.85%    
Investment, principal $ 3,816 $ 4,000                
Investment owned, at cost 3,698 3,861                
Investments at fair value $ 3,704 $ 3,850                
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Diversified Support Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 10.43%   10.43% 10.43% 10.43% 10.43%        
Investment, principal $ 714 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 699 [6],[7],[11] (21) [1],[2],[17]                
Investments at fair value $ 688 [6],[7],[11] $ (24) [1],[2],[17]                
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Diversified Support Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[11] 6.00% [2],[17] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 10.43% [6],[8],[11] 11.40% [2],[3],[17] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 11.40% [2],[3],[17] 11.40% [2],[3],[17]    
Investment, principal $ 2,584 [6],[9],[11] $ 2,604 [2],[5],[17]                
Investment owned, at cost 2,555 [6],[11] 2,561 [2],[17]                
Investments at fair value $ 2,545 [6],[11] $ 2,568 [2],[17]                
Investment, Identifier [Axis]: MHE Intermediate Holdings, LLC, Diversified Support Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[11] 6.00% [2],[17] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 10.43% [6],[8],[11] 11.40% [2],[3],[17] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 10.43% [6],[8],[11] 11.40% [2],[3],[17] 11.40% [2],[3],[17]    
Investment, principal $ 7,224 [6],[9],[11] $ 7,224 [2],[5],[17]                
Investment owned, at cost 7,183 [6],[11] 7,167 [2],[17]                
Investments at fair value $ 7,116 [6],[11] $ 7,125 [2],[17]                
Investment, Identifier [Axis]: MRI Software LLC, Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% [6],[7],[11] 4.75% [1],[2],[17] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [1],[2],[17] 4.75% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 9.05%   9.05% 9.05% 9.05% 9.05%        
Investment, principal $ 253 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 203 [6],[7],[11] (69) [1],[2],[17]                
Investments at fair value $ 222 [6],[7],[11] $ (44) [1],[2],[17]                
Investment, Identifier [Axis]: MRI Software LLC, Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% [6],[11] 4.75% [2],[17] 4.75% [6],[11] 4.75% [6],[11] 4.75% [6],[11] 4.75% [6],[11] 4.75% [2],[17] 4.75% [2],[17]    
Investment, interest rate (as a percent) 9.05% [6],[8],[11] 9.35% [2],[3],[17] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.35% [2],[3],[17] 9.35% [2],[3],[17]    
Investment, principal $ 40,951 [6],[9],[11] $ 33,831 [2],[5],[17]                
Investment owned, at cost 40,727 [6],[11] 33,438 [2],[17]                
Investments at fair value $ 40,677 [6],[11] $ 33,503 [2],[17]                
Investment, Identifier [Axis]: MRI Software LLC, Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% [6],[11] 4.75% [2],[17] 4.75% [6],[11] 4.75% [6],[11] 4.75% [6],[11] 4.75% [6],[11] 4.75% [2],[17] 4.75% [2],[17]    
Investment, interest rate (as a percent) 9.05% [6],[8],[11] 9.35% [2],[3],[17] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.05% [6],[8],[11] 9.35% [2],[3],[17] 9.35% [2],[3],[17]    
Investment, principal $ 13,721 [6],[9],[11] $ 13,829 [2],[5],[17]                
Investment owned, at cost 13,702 [6],[11] 13,797 [2],[17]                
Investments at fair value $ 13,629 [6],[11] $ 13,695 [2],[17]                
Investment, Identifier [Axis]: MRI Software LLC, Application Software, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.75% [6],[7],[11] 4.75% [2],[17] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [6],[7],[11] 4.75% [2],[17] 4.75% [2],[17]    
Investment, interest rate (as a percent) 9.05% [6],[7],[8],[11] 9.35% [2],[3],[17] 9.05% [6],[7],[8],[11] 9.05% [6],[7],[8],[11] 9.05% [6],[7],[8],[11] 9.05% [6],[7],[8],[11] 9.35% [2],[3],[17] 9.35% [2],[3],[17]    
Investment, principal $ 1,967 [6],[7],[9],[11] $ 6,652 [2],[5],[17]                
Investment owned, at cost 1,947 [6],[7],[11] 6,609 [2],[17]                
Investments at fair value $ 1,951 [6],[7],[11] $ 6,588 [2],[17]                
Investment, Identifier [Axis]: MRI Software LLC, Application Software, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   4.75%         4.75% 4.75%    
Investment, interest rate (as a percent) [1],[2],[3],[17]   9.35%         9.35% 9.35%    
Investment, principal [1],[2],[5],[17]   $ 792                
Investment owned, at cost [1],[2],[17]   776                
Investments at fair value [1],[2],[17]   $ 760                
Investment, Identifier [Axis]: Marinus Pharmaceuticals, Inc., Pharmaceuticals, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [2],[3],[13]   11.50%         11.50% 11.50%    
Investment, principal [2],[5],[13]   $ 8,139                
Investment owned, at cost [2],[13]   8,096                
Investments at fair value [2],[13]   $ 7,773                
Investment, Identifier [Axis]: Marinus Pharmaceuticals, Inc., Pharmaceuticals, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [2],[3],[13]   11.50%         11.50% 11.50%    
Investment, principal [2],[5],[13]   $ 3,855                
Investment owned, at cost [2],[13]   3,835                
Investments at fair value [2],[13]   $ 3,682                
Investment, Identifier [Axis]: Marinus Pharmaceuticals, Inc., Pharmaceuticals, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [2],[3],[13]   11.50%         11.50% 11.50%    
Investment, principal [2],[5],[13]   $ 4,070                
Investment owned, at cost [2],[13]   4,048                
Investments at fair value [2],[13]   $ 3,886                
Investment, Identifier [Axis]: McAfee Corp, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.00%   3.00% 3.00% 3.00% 3.00%        
Investment, interest rate (as a percent) 7.32%   7.32% 7.32% 7.32% 7.32%        
Investment, principal $ 1,990                  
Investment owned, at cost 1,988                  
Investments at fair value $ 1,937                  
Investment, Identifier [Axis]: McAfee Corp., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.00% 3.25% 3.00% 3.00% 3.00% 3.00% 3.25% 3.25%    
Investment, interest rate (as a percent) 7.32% 8.45% 7.32% 7.32% 7.32% 7.32% 8.45% 8.45%    
Investment, principal $ 7,851 $ 7,890                
Investment owned, at cost 7,657 7,656                
Investments at fair value $ 7,640 $ 7,872                
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 9.75% [6],[8],[10] 9.75% [2],[3],[13] 9.75% [6],[8],[10] 9.75% [6],[8],[10] 9.75% [6],[8],[10] 9.75% [6],[8],[10] 9.75% [2],[3],[13] 9.75% [2],[3],[13]    
Investment, principal $ 6,511 [6],[9],[10] $ 7,660 [2],[5],[13]                
Investment owned, at cost 6,345 [6],[10] 7,359 [2],[13]                
Investments at fair value $ 6,576 [6],[10] $ 7,373 [2],[13]                
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [6],[10] 129,939   129,939 129,939 129,939 129,939        
Investment owned, at cost [6],[10] $ 545                  
Investments at fair value [6],[10] $ 546                  
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, Warrants 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [2],[13]   33,409         33,409 33,409    
Investment owned, at cost [2],[13]   $ 23                
Investments at fair value [2],[13]   $ 154                
Investment, Identifier [Axis]: Mesoblast, Inc., Biotechnology, Warrants 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [2],[13]   129,939         129,939 129,939    
Investment owned, at cost [2],[13]   $ 545                
Investments at fair value [2],[13]   $ 416                
Investment, Identifier [Axis]: Mindbody, Inc., Internet Services & Infrastructure, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[7],[11] 7.00% [1],[2],[17] 7.00% [6],[7],[11] 7.00% [6],[7],[11] 7.00% [6],[7],[11] 7.00% [6],[7],[11] 7.00% [1],[2],[17] 7.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 0 [6],[7],[11] (21) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ (56) [1],[2],[17]                
Investment, Identifier [Axis]: Mindbody, Inc., Internet Services & Infrastructure, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[11] 7.00% [2],[17] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [2],[17] 7.00% [2],[17]    
Investment, interest rate (as a percent) 11.29% [6],[8],[11] 12.40% [2],[3],[17] 11.29% [6],[8],[11] 11.29% [6],[8],[11] 11.29% [6],[8],[11] 11.29% [6],[8],[11] 12.40% [2],[3],[17] 12.40% [2],[3],[17]    
Investment, principal $ 39,221 [6],[9],[11] $ 51,356 [2],[5],[17]                
Investment owned, at cost 39,033 [6],[11] 51,142 [2],[17]                
Investments at fair value $ 39,221 [6],[11] $ 50,806 [2],[17]                
Investment, Identifier [Axis]: Mindbody, Inc., Internet Services & Infrastructure, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[11] 7.00% [2],[17] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [6],[11] 7.00% [2],[17] 7.00% [2],[17]    
Investment, interest rate (as a percent) 11.29% [6],[8],[11] 12.40% [2],[3],[17] 11.29% [6],[8],[11] 11.29% [6],[8],[11] 11.29% [6],[8],[11] 11.29% [6],[8],[11] 12.40% [2],[3],[17] 12.40% [2],[3],[17]    
Investment, principal $ 1,752 [6],[9],[11] $ 2,294 [2],[5],[17]                
Investment owned, at cost 1,713 [6],[11] 2,255 [2],[17]                
Investments at fair value $ 1,752 [6],[11] $ 2,269 [2],[17]                
Investment, Identifier [Axis]: Minotaur Acquisition, Inc., Financial Exchanges & Data, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[7],[10],[11] 5.00% [1],[2],[17] 5.00% [6],[7],[10],[11] 5.00% [6],[7],[10],[11] 5.00% [6],[7],[10],[11] 5.00% [6],[7],[10],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[10],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (12) [6],[7],[10],[11] (13) [1],[2],[17]                
Investments at fair value $ (4) [6],[7],[10],[11] $ (12) [1],[2],[17]                
Investment, Identifier [Axis]: Minotaur Acquisition, Inc., Financial Exchanges & Data, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[10],[11] 5.00% [2],[17] 5.00% [6],[10],[11] 5.00% [6],[10],[11] 5.00% [6],[10],[11] 5.00% [6],[10],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.33% [6],[8],[10],[11] 9.85% [2],[3],[17] 9.33% [6],[8],[10],[11] 9.33% [6],[8],[10],[11] 9.33% [6],[8],[10],[11] 9.33% [6],[8],[10],[11] 9.85% [2],[3],[17] 9.85% [2],[3],[17]    
Investment, principal $ 6,983 [6],[9],[10],[11] $ 7,056 [2],[5],[17]                
Investment owned, at cost 6,868 [6],[10],[11] 6,923 [2],[17]                
Investments at fair value $ 6,948 [6],[10],[11] $ 6,932 [2],[17]                
Investment, Identifier [Axis]: Minotaur Acquisition, Inc., Financial Exchanges & Data, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[7],[10],[11] 5.00% [1],[2],[17] 5.00% [6],[7],[10],[11] 5.00% [6],[7],[10],[11] 5.00% [6],[7],[10],[11] 5.00% [6],[7],[10],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[10],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (12) [6],[7],[10],[11] (12) [1],[2],[17]                
Investments at fair value $ (6) [6],[7],[10],[11] $ (11) [1],[2],[17]                
Investment, Identifier [Axis]: Minotaur Acquisition, Inc., Financial Exchanges & Data, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.00% [6],[10],[11] 5.00% [2],[17] 5.00% [6],[10],[11] 5.00% [6],[10],[11] 5.00% [6],[10],[11] 5.00% [6],[10],[11] 5.00% [2],[17] 5.00% [2],[17]    
Investment, interest rate (as a percent) 9.33% [6],[8],[10],[11] 9.85% [2],[3],[17] 9.33% [6],[8],[10],[11] 9.33% [6],[8],[10],[11] 9.33% [6],[8],[10],[11] 9.33% [6],[8],[10],[11] 9.85% [2],[3],[17] 9.85% [2],[3],[17]    
Investment, principal $ 1,149 [6],[9],[10],[11] $ 1,176 [2],[5],[17]                
Investment owned, at cost 1,126 [6],[10],[11] 1,152 [2],[17]                
Investments at fair value $ 1,143 [6],[10],[11] $ 1,156 [2],[17]                
Investment, Identifier [Axis]: Mitchell International, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.25% 3.25% 3.25% 3.25% 3.25% 3.25% 3.25% 3.25%    
Investment, interest rate (as a percent) 7.58% 8.10% 7.58% 7.58% 7.58% 7.58% 8.10% 8.10%    
Investment, principal $ 7,940 $ 8,000                
Investment owned, at cost 7,893 7,953                
Investments at fair value $ 7,943 $ 7,892                
Investment, Identifier [Axis]: Mitchell International, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.25%         3.25% 3.25%    
Investment, interest rate (as a percent)   8.10%         8.10% 8.10%    
Investment, principal   $ 3,500                
Investment owned, at cost   3,480                
Investments at fair value   $ 3,453                
Investment, Identifier [Axis]: Modena Buyer LLC, Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% [11] 4.50% [17] 4.50% [11] 4.50% [11] 4.50% [11] 4.50% [11] 4.50% [17] 4.50% [17]    
Investment, interest rate (as a percent) 8.78% [8],[11] 9.10% [3],[17] 8.78% [8],[11] 8.78% [8],[11] 8.78% [8],[11] 8.78% [8],[11] 9.10% [3],[17] 9.10% [3],[17]    
Investment, principal $ 23,694 [9],[11] $ 27,705 [5],[17]                
Investment owned, at cost 23,286 [11] 27,169 [17]                
Investments at fair value $ 22,880 [11] $ 26,588 [17]                
Investment, Identifier [Axis]: Monotype Imaging Holdings Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (56) [6],[7],[11] (65) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Monotype Imaging Holdings Inc., Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.50% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [2],[17] 5.50% [2],[17]    
Investment, interest rate (as a percent) 9.80% [6],[8],[11] 10.56% [2],[3],[17] 9.80% [6],[8],[11] 9.80% [6],[8],[11] 9.80% [6],[8],[11] 9.80% [6],[8],[11] 10.56% [2],[3],[17] 10.56% [2],[3],[17]    
Investment, principal $ 38,038 [6],[9],[11] $ 38,326 [2],[5],[17]                
Investment owned, at cost 37,467 [6],[11] 37,751 [2],[17]                
Investments at fair value $ 38,038 [6],[11] $ 38,326 [2],[17]                
Investment, Identifier [Axis]: Monotype Imaging Holdings Inc., Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 9.80%   9.80% 9.80% 9.80% 9.80%        
Investment, principal $ 824 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 793 [6],[7],[11] (24) [1],[2],[17]                
Investments at fair value $ 824 [6],[7],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Mosaic Companies, LLC, Home Improvement Retail, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.25% [6],[11],[15] 8.25% [2],[17] 8.25% [6],[11],[15] 8.25% [6],[11],[15] 8.25% [6],[11],[15] 8.25% [6],[11],[15] 8.25% [2],[17] 8.25% [2],[17]    
Investment, interest rate (as a percent) [2],[3],[17]   10.58%         10.58% 10.58%    
Investment, interest rate, paid in kind (as a percent) [2],[17]   3.25%         3.25% 3.25%    
Investment, principal $ 26,503 [6],[9],[11],[15] $ 50,077 [2],[5],[17]                
Investment owned, at cost 24,713 [6],[11],[15] 49,891 [2],[17]                
Investments at fair value $ 5,314 [6],[11],[15] $ 48,775 [2],[17]                
Investment, Identifier [Axis]: NN, Inc., Industrial Machinery & Supplies & Components, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[13],[17]   8.88%         8.88% 8.88%    
Investment, interest rate (as a percent) [2],[3],[13],[17]   11.82%         11.82% 11.82%    
Investment, interest rate, paid in kind (as a percent) [2],[13],[17]   2.00%         2.00% 2.00%    
Investment, principal [2],[5],[13],[17]   $ 56,701                
Investment owned, at cost [2],[13],[17]   56,248                
Investments at fair value [2],[13],[17]   $ 55,737                
Investment, Identifier [Axis]: NN, Inc., Industrial Machinery & Supplies & Components, Warrants 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 487,870 [10] 487,870 [13] 487,870 [10] 487,870 [10] 487,870 [10] 487,870 [10] 487,870 [13] 487,870 [13]    
Investment owned, at cost $ 0 [10] $ 0 [13]                
Investments at fair value $ 1,020 [10] $ 1,898 [13]                
Investment, Identifier [Axis]: NN, Inc., Industrial Machinery & Supplies & Components, Warrants 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 239,590 [10] 239,590 [13] 239,590 [10] 239,590 [10] 239,590 [10] 239,590 [10] 239,590 [13] 239,590 [13]    
Investment owned, at cost $ 0 [10] $ 0 [13]                
Investments at fair value $ 501 [10] $ 932 [13]                
Investment, Identifier [Axis]: Nellson Nutraceutical, LLC, Packaged Foods & Meats, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[10],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, interest rate (as a percent) [6],[7],[8],[10],[11] 12.25%   12.25% 12.25% 12.25% 12.25%        
Investment, principal [6],[7],[9],[10],[11] $ 513                  
Investment owned, at cost [6],[7],[10],[11] 484                  
Investments at fair value [6],[7],[10],[11] $ 485                  
Investment, Identifier [Axis]: Nellson Nutraceutical, LLC, Packaged Foods & Meats, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 5.75%   5.75% 5.75% 5.75% 5.75%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 10.05%   10.05% 10.05% 10.05% 10.05%        
Investment, principal [6],[9],[10],[11] $ 2,866                  
Investment owned, at cost [6],[10],[11] 2,824                  
Investments at fair value [6],[10],[11] $ 2,826                  
Investment, Identifier [Axis]: Nellson Nutraceutical, LLC, Packaged Foods & Meats, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 5.75%   5.75% 5.75% 5.75% 5.75%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 10.03%   10.03% 10.03% 10.03% 10.03%        
Investment, principal [6],[9],[10],[11] $ 9,655                  
Investment owned, at cost [6],[10],[11] 9,515                  
Investments at fair value [6],[10],[11] $ 9,520                  
Investment, Identifier [Axis]: Nellson Nutraceutical, LLC, Packaged Foods & Meats, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[10],[11] 5.75%   5.75% 5.75% 5.75% 5.75%        
Investment, principal [6],[7],[9],[10],[11] $ 0                  
Investment owned, at cost [6],[7],[10],[11] (6)                  
Investments at fair value [6],[7],[10],[11] $ (5)                  
Investment, Identifier [Axis]: NeuAG, LLC, Fertilizers & Agricultural Chemicals, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   2.25%         2.25% 2.25%    
Investment, interest rate (as a percent) [2],[3],[17]   6.85%         6.85% 6.85%    
Investment, principal [2],[5],[17]   $ 55,783                
Investment owned, at cost [2],[17]   54,677                
Investments at fair value [2],[17]   $ 54,668                
Investment, Identifier [Axis]: Next Holdco, LLC, Health Care Technology, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[7],[11] 6.00% [1],[2],[17] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (21) [6],[7],[11] (25) [1],[2],[17]                
Investments at fair value $ (5) [6],[7],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Next Holdco, LLC, Health Care Technology, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   6.00%         6.00% 6.00%    
Investment, Identifier [Axis]: Next Holdco, LLC, Health Care Technology, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[11] 6.00% [2],[17] 5.25% [6],[11] 5.25% [6],[11] 5.25% [6],[11] 5.25% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 9.55% [6],[8],[11] 11.06% [2],[3],[17] 9.55% [6],[8],[11] 9.55% [6],[8],[11] 9.55% [6],[8],[11] 9.55% [6],[8],[11] 11.06% [2],[3],[17] 11.06% [2],[3],[17]    
Investment, principal $ 19,745 [6],[9],[11] $ 19,895 [2],[5],[17]                
Investment owned, at cost 19,518 [6],[11] 19,597 [2],[17]                
Investments at fair value $ 19,698 [6],[11] 19,895 [2],[17]                
Investment, Identifier [Axis]: Next Holdco, LLC, Health Care Technology, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.25%   5.25% 5.25% 5.25% 5.25%        
Investment, interest rate (as a percent) [6],[8],[11] 9.55%   9.55% 9.55% 9.55% 9.55%        
Investment, principal $ 7,785 [6],[9],[11] 0 [1],[2],[5],[17]                
Investment owned, at cost 7,712 [6],[11] (38) [1],[2],[17]                
Investments at fair value $ 7,766 [6],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Next Holdco, LLC, Health Care Technology, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.25%   5.25% 5.25% 5.25% 5.25%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (29)                  
Investments at fair value [6],[7],[11] $ (12)                  
Investment, Identifier [Axis]: Northwoods Capital 25 Ltd, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.40% [10],[11] 7.40% [13],[17] 7.40% [10],[11] 7.40% [10],[11] 7.40% [10],[11] 7.40% [10],[11] 7.40% [13],[17] 7.40% [13],[17]    
Investment, interest rate (as a percent) 11.67% [8],[10],[11] 12.68% [3],[13],[17] 11.67% [8],[10],[11] 11.67% [8],[10],[11] 11.67% [8],[10],[11] 11.67% [8],[10],[11] 12.68% [3],[13],[17] 12.68% [3],[13],[17]    
Investment, principal $ 700 [9],[10],[11] $ 700 [5],[13],[17]                
Investment owned, at cost 683 [10],[11] 682 [13],[17]                
Investments at fair value 695 [10],[11] 681 [13],[17]                
Investment, Identifier [Axis]: OCSI Glick JV LLC, Multi-Sector Holdings, Membership Interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, at cost 0 [7],[10],[23],[24] 0 [1],[13],[25],[26]                
Investments at fair value $ 0 [7],[10],[23],[24] $ 0 [1],[13],[25],[26]             $ 0 0
Investment, Identifier [Axis]: OCSI Glick JV LLC, Multi-Sector Holdings, Subordinated Debt                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% [6],[7],[10],[11],[23] 4.50% [1],[2],[13],[17],[25] 4.50% [6],[7],[10],[11],[23] 4.50% [6],[7],[10],[11],[23] 4.50% [6],[7],[10],[11],[23] 4.50% [6],[7],[10],[11],[23] 4.50% [1],[2],[13],[17],[25] 4.50% [1],[2],[13],[17],[25] 4.50%  
Investment, interest rate (as a percent) 8.93% [6],[7],[8],[10],[11],[23] 9.95% [1],[2],[3],[13],[17],[25] 8.93% [6],[7],[8],[10],[11],[23] 8.93% [6],[7],[8],[10],[11],[23] 8.93% [6],[7],[8],[10],[11],[23] 8.93% [6],[7],[8],[10],[11],[23] 9.95% [1],[2],[3],[13],[17],[25] 9.95% [1],[2],[3],[13],[17],[25] 9.94%  
Investment, principal $ 58,349 [6],[7],[9],[10],[11],[23] $ 58,349 [1],[2],[5],[13],[17],[25]             $ 58,349  
Investment owned, at cost 52,733 [6],[7],[10],[11],[23] 51,668 [1],[2],[13],[17],[25]                
Investments at fair value $ 47,064 [6],[7],[10],[11],[23] $ 48,896 [1],[2],[13],[17],[25]             $ 49,886 50,017
Investment, Identifier [Axis]: OEConnection LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.25%   3.25% 3.25% 3.25% 3.25%        
Investment, interest rate (as a percent) 7.58%   7.58% 7.58% 7.58% 7.58%        
Investment, principal $ 3,474                  
Investment owned, at cost 3,454                  
Investments at fair value $ 3,475                  
Investment, Identifier [Axis]: OTG Management, LLC, Airport Services, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 2,613,034 [6] 2,613,034 [2] 2,613,034 [6] 2,613,034 [6] 2,613,034 [6] 2,613,034 [6] 2,613,034 [2] 2,613,034 [2]    
Investment owned, at cost $ 22,330 [6] $ 22,330 [2]                
Investments at fair value $ 10,008 [6] $ 13,562 [2]                
Investment, Identifier [Axis]: OTG Management, LLC, Airport Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.50% [6],[11] 9.50% [2],[17] 8.50% [6],[11] 8.50% [6],[11] 8.50% [6],[11] 8.50% [6],[11] 9.50% [2],[17] 9.50% [2],[17]    
Investment, interest rate, paid in kind (as a percent) 12.81% [6],[11] 14.62% [2],[17] 12.81% [6],[11] 12.81% [6],[11] 12.81% [6],[11] 12.81% [6],[11] 14.62% [2],[17] 14.62% [2],[17]    
Investment, principal $ 13,394 [6],[9],[11] $ 12,070 [2],[5],[17]                
Investment owned, at cost 12,138 [6],[11] 10,611 [2],[17]                
Investments at fair value $ 13,394 [6],[11] $ 12,070 [2],[17]                
Investment, Identifier [Axis]: Optimizely North America Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[10],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal [6],[7],[9],[10],[11] $ 0                  
Investment owned, at cost [6],[7],[10],[11] (15)                  
Investments at fair value [6],[7],[10],[11] $ (17)                  
Investment, Identifier [Axis]: Optimizely North America Inc., Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 9.33%   9.33% 9.33% 9.33% 9.33%        
Investment, principal [6],[9],[10],[11] $ 11,358                  
Investment owned, at cost [6],[10],[11] 11,255                  
Investments at fair value [6],[10],[11] $ 11,244                  
Investment, Identifier [Axis]: Optimizely Sweden Holdings AB, Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 5.25%   5.25% 5.25% 5.25% 5.25%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 7.23%   7.23% 7.23% 7.23% 7.23%        
Investment, principal | € [6],[9],[10],[11]     € 4,058              
Investment owned, at cost [6],[10],[11] $ 4,369                  
Investments at fair value [6],[10],[11] $ 4,716                  
Investment, Identifier [Axis]: Optimizely Sweden Holdings AB, Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[10],[11] 5.50%   5.50% 5.50% 5.50% 5.50%        
Investment, interest rate (as a percent) [6],[8],[10],[11] 9.72%   9.72% 9.72% 9.72% 9.72%        
Investment, principal | £ [6],[9],[10],[11]       £ 1,353            
Investment owned, at cost [6],[10],[11] $ 1,744                  
Investments at fair value [6],[10],[11] $ 1,835                  
Investment, Identifier [Axis]: Oranje Holdco, Inc., Systems Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.75% [6],[7],[11] 7.50% [1],[2],[17] 7.75% [6],[7],[11] 7.75% [6],[7],[11] 7.75% [6],[7],[11] 7.75% [6],[7],[11] 7.50% [1],[2],[17] 7.50% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (28) [6],[7],[11] (34) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Oranje Holdco, Inc., Systems Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.75% [6],[11] 7.50% [2],[17] 7.75% [6],[11] 7.75% [6],[11] 7.75% [6],[11] 7.75% [6],[11] 7.50% [2],[17] 7.50% [2],[17]    
Investment, interest rate (as a percent) 12.03% [6],[8],[11] 12.75% [2],[3],[17] 12.03% [6],[8],[11] 12.03% [6],[8],[11] 12.03% [6],[8],[11] 12.03% [6],[8],[11] 12.75% [2],[3],[17] 12.75% [2],[3],[17]    
Investment, principal $ 15,231 [6],[9],[11] $ 15,231 [2],[5],[17]                
Investment owned, at cost 15,003 [6],[11] 14,956 [2],[17]                
Investments at fair value $ 15,231 [6],[11] $ 15,231 [2],[17]                
Investment, Identifier [Axis]: Oranje Holdco, Inc., Systems Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.25% [6],[11] 7.25% [2],[17] 7.25% [6],[11] 7.25% [6],[11] 7.25% [6],[11] 7.25% [6],[11] 7.25% [2],[17] 7.25% [2],[17]    
Investment, interest rate (as a percent) 11.55% [6],[8],[11] 12.50% [2],[3],[17] 11.55% [6],[8],[11] 11.55% [6],[8],[11] 11.55% [6],[8],[11] 11.55% [6],[8],[11] 12.50% [2],[3],[17] 12.50% [2],[3],[17]    
Investment, principal $ 4,047 [6],[9],[11] $ 4,047 [2],[5],[17]                
Investment owned, at cost 3,986 [6],[11] 3,974 [2],[17]                
Investments at fair value 4,047 [6],[11] 3,986 [2],[17]                
Investment, Identifier [Axis]: Other cash accounts                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, at cost 60,120 43,946                
Investments at fair value $ 60,120 $ 43,946                
Investment, Identifier [Axis]: PAI Financing Merger Sub LLC, Pharmaceuticals, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (74)                  
Investments at fair value [6],[7],[11] $ (78)                  
Investment, Identifier [Axis]: PAI Financing Merger Sub LLC, Pharmaceuticals, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, interest rate (as a percent) [6],[8],[11] 9.05%   9.05% 9.05% 9.05% 9.05%        
Investment, principal [6],[9],[11] $ 24,559                  
Investment owned, at cost [6],[11] 24,211                  
Investments at fair value [6],[11] $ 24,191                  
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., Aerospace & Defense, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, interest rate (as a percent) 13.00% [6],[7],[8],[11] 11.35% [1],[2],[3],[17] 13.00% [6],[7],[8],[11] 13.00% [6],[7],[8],[11] 13.00% [6],[7],[8],[11] 13.00% [6],[7],[8],[11] 11.35% [1],[2],[3],[17] 11.35% [1],[2],[3],[17]    
Investment, principal $ 274 [6],[7],[9],[11] $ 753 [1],[2],[5],[17]                
Investment owned, at cost 238 [6],[7],[11] 710 [1],[2],[17]                
Investments at fair value $ 274 [6],[7],[11] $ 753 [1],[2],[17]                
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., Aerospace & Defense, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% [6],[11] 6.50% [2],[17] 6.50% [6],[11] 6.50% [6],[11] 6.50% [6],[11] 6.50% [6],[11] 6.50% [2],[17] 6.50% [2],[17]    
Investment, interest rate (as a percent) 10.83% [6],[8],[11] 11.35% [2],[3],[17] 10.83% [6],[8],[11] 10.83% [6],[8],[11] 10.83% [6],[8],[11] 10.83% [6],[8],[11] 11.35% [2],[3],[17] 11.35% [2],[3],[17]    
Investment, principal $ 10,704 [6],[9],[11] $ 10,786 [2],[5],[17]                
Investment owned, at cost 10,445 [6],[11] 10,471 [2],[17]                
Investments at fair value $ 10,704 [6],[11] $ 10,786 [2],[17]                
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., Aerospace & Defense, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.50% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [2],[17] 5.50% [2],[17]    
Investment, interest rate (as a percent) 9.80% [6],[8],[11] 10.10% [2],[3],[17] 9.80% [6],[8],[11] 9.80% [6],[8],[11] 9.80% [6],[8],[11] 9.80% [6],[8],[11] 10.10% [2],[3],[17] 10.10% [2],[3],[17]    
Investment, principal $ 9,285 [6],[9],[11] $ 5,088 [2],[5],[17]                
Investment owned, at cost 9,258 [6],[11] 5,057 [2],[17]                
Investments at fair value $ 9,261 [6],[11] $ 5,019 [2],[17]                
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., Aerospace & Defense, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (34) [6],[7],[11] (71) [1],[2],[17]                
Investments at fair value $ (13) [6],[7],[11] $ (128) [1],[2],[17]                
Investment, Identifier [Axis]: PPW Aero Buyer, Inc., Aerospace & Defense, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[11] 9.30%   9.30% 9.30% 9.30% 9.30%        
Investment, principal [6],[9],[11] $ 3,944                  
Investment owned, at cost [6],[11] 3,907                  
Investments at fair value [6],[11] $ 3,909                  
Investment, Identifier [Axis]: PRGX Global, Inc., Data Processing & Outsourced Services, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 100,000 [6] 100,000 [2] 100,000 [6] 100,000 [6] 100,000 [6] 100,000 [6] 100,000 [2] 100,000 [2]    
Investment owned, at cost $ 0 [6] $ 109 [2]                
Investments at fair value $ 245 [6] $ 415 [2]                
Investment, Identifier [Axis]: PRGX Global, Inc., Data Processing & Outsourced Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   6.50%         6.50% 6.50%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   (20)                
Investments at fair value [1],[2],[17]   $ 0                
Investment, Identifier [Axis]: PRGX Global, Inc., Data Processing & Outsourced Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   6.50%         6.50% 6.50%    
Investment, interest rate (as a percent) [2],[3],[17]   11.90%         11.90% 11.90%    
Investment, principal [2],[5],[17]   $ 26,176                
Investment owned, at cost [2],[17]   25,994                
Investments at fair value [2],[17]   $ 26,176                
Investment, Identifier [Axis]: Park Blue CLO Ltd, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [10],[11] 7.09%   7.09% 7.09% 7.09% 7.09%        
Investment, interest rate (as a percent) [8],[10],[11] 11.36%   11.36% 11.36% 11.36% 11.36%        
Investment, principal [9],[10],[11] $ 2,750                  
Investment owned, at cost [10],[11] 2,835                  
Investments at fair value [10],[11] $ 2,729                  
Investment, Identifier [Axis]: Paulus Holdings Public Limited Company, Health Care Technology, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [6],[10] 57,324   57,324 57,324 57,324 57,324        
Investment owned, at cost [6],[10] $ 1,165                  
Investments at fair value [6],[10] $ 1,768                  
Investment, Identifier [Axis]: Paulus Holdings Public Limited Company, Health Care Technology, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [6],[10] 12,592   12,592 12,592 12,592 12,592        
Investment owned, at cost [6],[10] $ 256                  
Investments at fair value [6],[10] $ 388                  
Investment, Identifier [Axis]: Peraton Corp., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%    
Investment, interest rate (as a percent) 8.18% 8.70% 8.18% 8.18% 8.18% 8.18% 8.70% 8.70%    
Investment, principal $ 782 $ 1,978                
Investment owned, at cost 781 1,977                
Investments at fair value $ 692 $ 1,909                
Investment, Identifier [Axis]: Peraton Corp., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%    
Investment, interest rate (as a percent) 8.18% 8.70% 8.18% 8.18% 8.18% 8.18% 8.70% 8.70%    
Investment, principal $ 390 $ 990                
Investment owned, at cost 390 989                
Investments at fair value $ 346 $ 954                
Investment, Identifier [Axis]: Performance Health Holdings Inc, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75%   3.75% 3.75% 3.75% 3.75%        
Investment, interest rate (as a percent) 7.95%   7.95% 7.95% 7.95% 7.95%        
Investment, principal $ 8,000                  
Investment owned, at cost 7,920                  
Investments at fair value $ 7,800                  
Investment, Identifier [Axis]: Performance Health Holdings, Inc., Health Care Distributors, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   5.75%         5.75% 5.75%    
Investment, interest rate (as a percent) [2],[3],[17]   11.11%         11.11% 11.11%    
Investment, principal [2],[5],[17]   $ 22,375                
Investment owned, at cost [2],[17]   22,238                
Investments at fair value [2],[17]   $ 22,375                
Investment, Identifier [Axis]: PetSmart LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%    
Investment, interest rate (as a percent) 8.18% 8.70% 8.18% 8.18% 8.18% 8.18% 8.70% 8.70%    
Investment, principal $ 7,887 $ 7,948                
Investment owned, at cost 7,824 7,871                
Investments at fair value $ 7,823 $ 7,893                
Investment, Identifier [Axis]: PetSmart LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75% 3.75%    
Investment, interest rate (as a percent) 8.18% 8.70% 8.18% 8.18% 8.18% 8.18% 8.70% 8.70%    
Investment, principal $ 2,956 $ 2,980                
Investment owned, at cost 2,927 2,944                
Investments at fair value $ 2,932 $ 2,959                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, Health Care Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (100) [6],[7],[11] (117) [1],[2],[17]                
Investments at fair value $ (398) [6],[7],[11] $ (175) [1],[2],[17]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, Health Care Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[11] 6.00% [2],[17] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 10.33% [6],[8],[11] 10.85% [2],[3],[17] 10.33% [6],[8],[11] 10.33% [6],[8],[11] 10.33% [6],[8],[11] 10.33% [6],[8],[11] 10.85% [2],[3],[17] 10.85% [2],[3],[17]    
Investment, principal $ 51,849 [6],[9],[11] $ 52,244 [2],[5],[17]                
Investment owned, at cost 51,053 [6],[11] 51,330 [2],[17]                
Investments at fair value $ 48,842 [6],[11] $ 50,912 [2],[17]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, Health Care Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [6],[7],[11] 6.00% [1],[2],[17] 6.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (69) [6],[7],[11] (69) [1],[2],[17]                
Investments at fair value $ (330) [6],[7],[11] $ (106) [1],[2],[17]                
Investment, Identifier [Axis]: PetVet Care Centers, LLC, Health Care Services, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 4,531 [6] 4,531 [2] 4,531 [6] 4,531 [6] 4,531 [6] 4,531 [6] 4,531 [2] 4,531 [2]    
Investment owned, at cost $ 4,440 [6] $ 4,440 [2]                
Investments at fair value $ 5,401 [6] $ 5,022 [2]                
Investment, Identifier [Axis]: Phoenix Finance, Inc., Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 9.00%   9.00% 9.00% 9.00% 9.00%        
Investment, interest rate (as a percent) [6],[8],[11]          
Investment, interest rate, paid in kind (as a percent) [6],[11] 13.30%   13.30% 13.30% 13.30% 13.30%        
Investment, principal [6],[9],[11] $ 5,149                  
Investment owned, at cost [6],[11] 5,011                  
Investments at fair value [6],[11] $ 4,994                  
Investment, Identifier [Axis]: Phoenix Finance, Inc., Application Software, Second Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 7.50%   7.50% 7.50% 7.50% 7.50%        
Investment, interest rate (as a percent) [6],[8],[11]          
Investment, interest rate, paid in kind (as a percent) [6],[11] 11.95%   11.95% 11.95% 11.95% 11.95%        
Investment, principal [6],[9],[11] $ 9,257                  
Investment owned, at cost [6],[11] 9,243                  
Investments at fair value [6],[11] $ 8,378                  
Investment, Identifier [Axis]: Pluralsight, LLC, Application Software, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 4,300,526 [6] 4,300,526 [2] 4,300,526 [6] 4,300,526 [6] 4,300,526 [6] 4,300,526 [6] 4,300,526 [2] 4,300,526 [2]    
Investment, principal [2],[5]                  
Investment owned, at cost $ 14,364 [6] 14,364 [2]                
Investments at fair value $ 9,977 [6] $ 14,364 [2]                
Investment, Identifier [Axis]: Pluralsight, LLC, Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% [6],[7],[11] 4.50% [1],[2],[17] 4.50% [6],[7],[11] 4.50% [6],[7],[11] 4.50% [6],[7],[11] 4.50% [6],[7],[11] 4.50% [1],[2],[17] 4.50% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 0 [6],[7],[11] 0 [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Pluralsight, LLC, Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% [6],[11] 4.50% [2],[17] 4.50% [6],[11] 4.50% [6],[11] 4.50% [6],[11] 4.50% [6],[11] 4.50% [2],[17] 4.50% [2],[17]    
Investment, interest rate (as a percent) 7.33% [6],[8],[11] 8.12% [2],[3],[17] 7.33% [6],[8],[11] 7.33% [6],[8],[11] 7.33% [6],[8],[11] 7.33% [6],[8],[11] 8.12% [2],[3],[17] 8.12% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) 1.50% [6],[11] 1.50% [2],[17] 1.50% [6],[11] 1.50% [6],[11] 1.50% [6],[11] 1.50% [6],[11] 1.50% [2],[17] 1.50% [2],[17]    
Investment, principal $ 5,023 [6],[9],[11] $ 4,965 [2],[5],[17]                
Investment owned, at cost 5,023 [6],[11] 4,965 [2],[17]                
Investments at fair value $ 5,023 [6],[11] $ 4,965 [2],[17]                
Investment, Identifier [Axis]: Pluralsight, LLC, Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% [6],[11] 4.50% [1],[2],[17] 4.50% [6],[11] 4.50% [6],[11] 4.50% [6],[11] 4.50% [6],[11] 4.50% [1],[2],[17] 4.50% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[8],[11] 7.33%   7.33% 7.33% 7.33% 7.33%        
Investment, interest rate, paid in kind (as a percent) [6],[11] 1.50%   1.50% 1.50% 1.50% 1.50%        
Investment, principal $ 8,701 [6],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 8,701 [6],[11] 0 [1],[2],[17]                
Investments at fair value $ 8,701 [6],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Pluralsight, LLC, Application Software, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% [6],[11] 4.50% [2],[17] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 7.50% [6],[11] 4.50% [2],[17] 4.50% [2],[17]    
Investment, interest rate (as a percent) [2],[3],[17]   8.12%         8.12% 8.12%    
Investment, interest rate, paid in kind (as a percent) 11.83% [6],[11] 1.50% [2],[17] 11.83% [6],[11] 11.83% [6],[11] 11.83% [6],[11] 11.83% [6],[11] 1.50% [2],[17] 1.50% [2],[17]    
Investment, principal $ 14,151 [6],[9],[11] $ 8,601 [2],[5],[17]                
Investment owned, at cost 14,151 [6],[11] 8,601 [2],[17]                
Investments at fair value $ 14,151 [6],[11] $ 8,601 [2],[17]                
Investment, Identifier [Axis]: Pluralsight, LLC, Application Software, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% [6],[7],[11] 7.50% [2],[17] 4.50% [6],[7],[11] 4.50% [6],[7],[11] 4.50% [6],[7],[11] 4.50% [6],[7],[11] 7.50% [2],[17] 7.50% [2],[17]    
Investment, interest rate, paid in kind (as a percent) [2],[17]   12.62%         12.62% 12.62%    
Investment, principal $ 0 [6],[7],[9],[11] $ 12,902 [2],[5],[17]                
Investment owned, at cost 0 [6],[7],[11] 12,902 [2],[17]                
Investments at fair value 0 [6],[7],[11] 12,902 [2],[17]                
Investment, Identifier [Axis]: Pluralsight, LLC, Common Equity & Warrants | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal                  
Investment owned, at cost 1,105 1,105                
Investments at fair value 768 $ 1,105                
Investment, Identifier [Axis]: Pluralsight, LLC, Common Stock | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares   514,789         514,789 514,789    
Investment, principal                
Investment owned, at cost 1,719 1,719                
Investments at fair value $ 1,194 $ 1,719                
Investment, Identifier [Axis]: Pluralsight, LLC, First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% 7.50% 4.50% 4.50% 4.50% 4.50% 7.50% 7.50%    
Investment, interest rate (as a percent) 7.33%   7.33% 7.33% 7.33% 7.33%        
Investment, interest rate, paid in kind (as a percent) 1.50% 12.62% 1.50% 1.50% 1.50% 1.50% 12.62% 12.62%    
Investment, principal $ 1,042 $ 1,544                
Investment owned, at cost 1,042 1,544                
Investments at fair value $ 1,042 $ 1,544                
Investment, Identifier [Axis]: Pluralsight, LLC, First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50% 4.50%    
Investment, interest rate (as a percent) 7.33% 8.12% 7.33% 7.33% 7.33% 7.33% 8.12% 8.12%    
Investment, interest rate, paid in kind (as a percent) 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%    
Investment, principal $ 670 $ 662                
Investment owned, at cost 670 662                
Investments at fair value $ 670 $ 662                
Investment, Identifier [Axis]: Pluralsight, LLC, First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% 4.50% 7.50% 7.50% 7.50% 7.50% 4.50% 4.50%    
Investment, interest rate (as a percent)   8.12%         8.12% 8.12%    
Investment, interest rate, paid in kind (as a percent) 11.83% 1.50% 11.83% 11.83% 11.83% 11.83% 1.50% 1.50%    
Investment, principal $ 1,694 $ 1,030                
Investment owned, at cost 1,694 1,030                
Investments at fair value $ 1,694 $ 1,030                
Investment, Identifier [Axis]: Pluralsight, LLC, First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%    
Investment, interest rate, paid in kind (as a percent) 11.83% 12.62% 11.83% 11.83% 11.83% 11.83% 12.62% 12.62%    
Investment, principal $ 1,089 $ 993                
Investment owned, at cost 1,089 993                
Investments at fair value $ 1,089 $ 993                
Investment, Identifier [Axis]: Poseidon Midco AB, Pharmaceuticals, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[10],[11] 5.50% [2],[13],[17] 5.50% [6],[10],[11] 5.50% [6],[10],[11] 5.50% [6],[10],[11] 5.50% [6],[10],[11] 5.50% [2],[13],[17] 5.50% [2],[13],[17]    
Investment, interest rate (as a percent) 7.56% [6],[8],[10],[11] 8.97% [2],[3],[13],[17] 7.56% [6],[8],[10],[11] 7.56% [6],[8],[10],[11] 7.56% [6],[8],[10],[11] 7.56% [6],[8],[10],[11] 8.97% [2],[3],[13],[17] 8.97% [2],[3],[13],[17]    
Investment, principal | €     € 12,868 [6],[9],[10],[11]       € 12,868 [2],[5],[13],[17]      
Investment owned, at cost $ 13,993 [6],[10],[11] $ 13,949 [2],[13],[17]                
Investments at fair value $ 15,105 [6],[10],[11] $ 13,994 [2],[13],[17]                
Investment, Identifier [Axis]: Poseidon Midco AB, Pharmaceuticals, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[10],[11] 5.50% [1],[2],[13],[17] 5.50% [6],[7],[10],[11] 5.50% [6],[7],[10],[11] 5.50% [6],[7],[10],[11] 5.50% [6],[7],[10],[11] 5.50% [1],[2],[13],[17] 5.50% [1],[2],[13],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[10],[11] 9.72%   9.72% 9.72% 9.72% 9.72%        
Investment, principal $ 5,846 [6],[7],[9],[10],[11] $ 0 [1],[2],[5],[13],[17]                
Investment owned, at cost 5,788 [6],[7],[10],[11] 0 [1],[2],[13],[17]                
Investments at fair value $ 5,846 [6],[7],[10],[11] $ 0 [1],[2],[13],[17]                
Investment, Identifier [Axis]: Poseidon Midco AB, Pharmaceuticals, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[10],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal | € [6],[7],[9],[10],[11]     € 0              
Investment owned, at cost [6],[7],[10],[11] $ (49)                  
Investments at fair value [6],[7],[10],[11] $ (51)                  
Investment, Identifier [Axis]: Profrac Holdings II, LLC, Industrial Machinery & Supplies & Components, First Lien Floating Rate Bond                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.25% [6],[10],[11] 7.25% [2],[13],[17] 7.25% [6],[10],[11] 7.25% [6],[10],[11] 7.25% [6],[10],[11] 7.25% [6],[10],[11] 7.25% [2],[13],[17] 7.25% [2],[13],[17]    
Investment, interest rate (as a percent) 11.54% [6],[8],[10],[11] 11.84% [2],[3],[13],[17] 11.54% [6],[8],[10],[11] 11.54% [6],[8],[10],[11] 11.54% [6],[8],[10],[11] 11.54% [6],[8],[10],[11] 11.84% [2],[3],[13],[17] 11.84% [2],[3],[13],[17]    
Investment, principal $ 24,513 [6],[9],[10],[11] $ 26,642 [2],[5],[13],[17]                
Investment owned, at cost 24,268 [6],[10],[11] 26,376 [2],[13],[17]                
Investments at fair value $ 24,268 [6],[10],[11] $ 26,410 [2],[13],[17]                
Investment, Identifier [Axis]: Protein For Pets Opco, LLC, Packaged Foods & Meats, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[7],[11] 5.25% [1],[2],[17] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [1],[2],[17] 5.25% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 9.58%   9.58% 9.58% 9.58% 9.58%        
Investment, principal $ 572 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 538 [6],[7],[11] (39) [1],[2],[17]                
Investments at fair value $ 526 [6],[7],[11] $ (41) [1],[2],[17]                
Investment, Identifier [Axis]: Protein For Pets Opco, LLC, Packaged Foods & Meats, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[11] 5.25% [2],[17] 5.25% [6],[11] 5.25% [6],[11] 5.25% [6],[11] 5.25% [6],[11] 5.25% [2],[17] 5.25% [2],[17]    
Investment, interest rate (as a percent) 9.58% [6],[8],[11] 10.10% [2],[3],[17] 9.58% [6],[8],[11] 9.58% [6],[8],[11] 9.58% [6],[8],[11] 9.58% [6],[8],[11] 10.10% [2],[3],[17] 10.10% [2],[3],[17]    
Investment, principal $ 20,122 [6],[9],[11] $ 20,274 [2],[5],[17]                
Investment owned, at cost 19,798 [6],[11] 19,902 [2],[17]                
Investments at fair value $ 19,693 [6],[11] $ 19,887 [2],[17]                
Investment, Identifier [Axis]: Quantum Bidco Limited, Food Distributors, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[13],[17]   5.50%         5.50% 5.50%    
Investment, interest rate (as a percent) [2],[3],[13],[17]   10.73%         10.73% 10.73%    
Investment, principal | £ [2],[5],[13],[17]               £ 9,739    
Investment owned, at cost [2],[13],[17]   $ 12,092                
Investments at fair value [2],[13],[17]   $ 12,769                
Investment, Identifier [Axis]: Quantum Bidco Limited, Food Distributors, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[13],[17]   5.50%         5.50% 5.50%    
Investment, interest rate (as a percent) [1],[2],[3],[13],[17]   10.70%         10.70% 10.70%    
Investment, principal [1],[2],[5],[13],[17]   $ 2,123                
Investment owned, at cost [1],[2],[13],[17]   2,547                
Investments at fair value [1],[2],[13],[17]   $ 2,715                
Investment, Identifier [Axis]: QuorumLabs, Inc., Application Software, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [2]   64,887,669         64,887,669 64,887,669    
Investment owned, at cost [2]   $ 375                
Investments at fair value [2]   $ 0                
Investment, Identifier [Axis]: Renaissance Holding Corp, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) 8.28%   8.28% 8.28% 8.28% 8.28%        
Investment, principal $ 2,455                  
Investment owned, at cost 2,449                  
Investments at fair value $ 2,237                  
Investment, Identifier [Axis]: Renaissance Holding Corp., Education Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [11] 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) [8],[11] 8.28%   8.28% 8.28% 8.28% 8.28%        
Investment, principal [9],[11] $ 9,923                  
Investment owned, at cost [11] 9,739                  
Investments at fair value [11] $ 9,039                  
Investment, Identifier [Axis]: Renaissance Holding Corp., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% 4.25% 4.00% 4.00% 4.00% 4.00% 4.25% 4.25%    
Investment, interest rate (as a percent) 8.28% 9.10% 8.28% 8.28% 8.28% 8.28% 9.10% 9.10%    
Investment, principal $ 10,352 $ 8,920                
Investment owned, at cost 10,238 8,793                
Investments at fair value $ 9,430 $ 8,927                
Investment, Identifier [Axis]: Renaissance Holding Corp., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.25%         4.25% 4.25%    
Investment, interest rate (as a percent)   9.10%         9.10% 9.10%    
Investment, principal   $ 1,985                
Investment owned, at cost   1,980                
Investments at fair value   $ 1,986                
Investment, Identifier [Axis]: RumbleOn, Inc., Automotive Retail, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.25% [6],[10],[11] 8.25% [2],[13],[17] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [2],[13],[17] 8.25% [2],[13],[17]    
Investment, interest rate (as a percent) 11.79% [6],[8],[10],[11] 12.77% [2],[3],[13],[17] 11.79% [6],[8],[10],[11] 11.79% [6],[8],[10],[11] 11.79% [6],[8],[10],[11] 11.79% [6],[8],[10],[11] 12.77% [2],[3],[13],[17] 12.77% [2],[3],[13],[17]    
Investment, interest rate, paid in kind (as a percent) 1.00% [6],[10],[11] 1.00% [2],[13],[17] 1.00% [6],[10],[11] 1.00% [6],[10],[11] 1.00% [6],[10],[11] 1.00% [6],[10],[11] 1.00% [2],[13],[17] 1.00% [2],[13],[17]    
Investment, principal $ 8,898 [6],[9],[10],[11] $ 8,819 [2],[5],[13],[17]                
Investment owned, at cost 8,782 [6],[10],[11] 8,629 [2],[13],[17]                
Investments at fair value $ 8,364 [6],[10],[11] $ 8,334 [2],[13],[17]                
Investment, Identifier [Axis]: RumbleOn, Inc., Automotive Retail, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 8.25% [6],[10],[11] 8.25% [2],[13],[17] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [6],[10],[11] 8.25% [2],[13],[17] 8.25% [2],[13],[17]    
Investment, interest rate (as a percent) 11.79% [6],[8],[10],[11] 12.77% [2],[3],[13],[17] 11.79% [6],[8],[10],[11] 11.79% [6],[8],[10],[11] 11.79% [6],[8],[10],[11] 11.79% [6],[8],[10],[11] 12.77% [2],[3],[13],[17] 12.77% [2],[3],[13],[17]    
Investment, interest rate, paid in kind (as a percent) 1.00% [6],[10],[11] 1.00% [2],[13],[17] 1.00% [6],[10],[11] 1.00% [6],[10],[11] 1.00% [6],[10],[11] 1.00% [6],[10],[11] 1.00% [2],[13],[17] 1.00% [2],[13],[17]    
Investment, principal $ 29,484 [6],[9],[10],[11] $ 29,223 [2],[5],[13],[17]                
Investment owned, at cost 29,088 [6],[10],[11] 28,603 [2],[13],[17]                
Investments at fair value $ 27,715 [6],[10],[11] $ 27,615 [2],[13],[17]                
Investment, Identifier [Axis]: RumbleOn, Inc., Automotive Retail, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 204,454 [6],[10] 204,454 [2],[13] 204,454 [6],[10] 204,454 [6],[10] 204,454 [6],[10] 204,454 [6],[10] 204,454 [2],[13] 204,454 [2],[13]    
Investment owned, at cost $ 1,202 [6],[10] $ 1,202 [2],[13]                
Investments at fair value $ 123 [6],[10] $ 470 [2],[13]                
Investment, Identifier [Axis]: SCIH Salt Holdings Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.00% 3.50% 3.00% 3.00% 3.00% 3.00% 3.50% 3.50%    
Investment, interest rate (as a percent) 7.32% 8.76% 7.32% 7.32% 7.32% 7.32% 8.76% 8.76%    
Investment, principal $ 2,948 $ 2,963                
Investment owned, at cost 2,948 2,963                
Investments at fair value $ 2,952 $ 2,966                
Investment, Identifier [Axis]: SCIH Salt Holdings Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.00% 3.50% 3.00% 3.00% 3.00% 3.00% 3.50% 3.50%    
Investment, interest rate (as a percent) 7.32% 8.76% 7.32% 7.32% 7.32% 7.32% 8.76% 8.76%    
Investment, principal $ 1,474 $ 1,480                
Investment owned, at cost 1,474 1,481                
Investments at fair value 1,476 $ 1,483                
Investment, Identifier [Axis]: SHO Holding I Corporation , First Lien Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.50%         6.50% 6.50%    
Investment, interest rate (as a percent)   11.82%         11.82% 11.82%    
Investment, principal   $ 697                
Investment owned, at cost   664                
Investments at fair value   683                
Investment, Identifier [Axis]: SHO Holding I Corporation, Common Equity & Warrants | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal                  
Investment owned, at cost 3,194 3,194                
Investments at fair value $ 1,940 $ 2,337                
Investment, Identifier [Axis]: SHO Holding I Corporation, Common Stock | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 2,746 2,746 2,746 2,746 2,746 2,746 2,746 2,746    
Investment owned, at cost $ 4,295 $ 4,295                
Investments at fair value $ 2,611 $ 3,145                
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 1 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment, interest rate (as a percent) 10.94% 11.82% 10.94% 10.94% 10.94% 10.94% 11.82% 11.82%    
Investment, principal $ 931 $ 938                
Investment owned, at cost 894 893                
Investments at fair value $ 898 $ 919                
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 2 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment, interest rate (as a percent) 10.94% 11.82% 10.94% 10.94% 10.94% 10.94% 11.82% 11.82%    
Investment, principal $ 2,614 $ 2,634                
Investment owned, at cost 2,614 2,634                
Investments at fair value $ 2,473 $ 2,529                
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.50%         6.50% 6.50%    
Investment, interest rate (as a percent)   11.82%         11.82% 11.82%    
Investment, principal   $ 1,957                
Investment owned, at cost   1,957                
Investments at fair value   $ 1,879                
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 3 | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%    
Investment, interest rate (as a percent) 4.44% 12.32% 4.44% 4.44% 4.44% 4.44% 12.32% 12.32%    
Investment, interest rate, paid in kind (as a percent) 7.00%   7.00% 7.00% 7.00% 7.00%        
Investment, principal $ 1,512 $ 1,451                
Investment owned, at cost 1,512 1,451                
Investments at fair value $ 1,346 $ 1,306                
Investment, Identifier [Axis]: SHO Holding I Corporation, First Lien Term Loan 3 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   7.00%         7.00% 7.00%    
Investment, interest rate (as a percent)   12.32%         12.32% 12.32%    
Investment, principal   $ 1,078                
Investment owned, at cost   1,078                
Investments at fair value   $ 970                
Investment, Identifier [Axis]: SHO Holding I Corporation, Senior Secured Debt Term Loan 1 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50%   6.50% 6.50% 6.50% 6.50%        
Investment, interest rate (as a percent) 10.94%   10.94% 10.94% 10.94% 10.94%        
Investment, principal $ 691                  
Investment owned, at cost 664                  
Investments at fair value $ 667                  
Investment, Identifier [Axis]: SHO Holding I Corporation, Senior Secured Debt Term Loan 2 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50%   6.50% 6.50% 6.50% 6.50%        
Investment, interest rate (as a percent) 10.94%   10.94% 10.94% 10.94% 10.94%        
Investment, principal $ 1,942                  
Investment owned, at cost 1,942                  
Investments at fair value $ 1,838                  
Investment, Identifier [Axis]: SHO Holding I Corporation, Senior Secured Debt Term Loan 3 | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00%   7.00% 7.00% 7.00% 7.00%        
Investment, interest rate (as a percent) 4.44%   4.44% 4.44% 4.44% 4.44%        
Investment, interest rate, paid in kind (as a percent) 7.00%   7.00% 7.00% 7.00% 7.00%        
Investment, principal $ 1,124                  
Investment owned, at cost 1,124                  
Investments at fair value $ 1,000                  
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 1,184,630 [6] 1,184,630 [2] 1,184,630 [6] 1,184,630 [6] 1,184,630 [6] 1,184,630 [6] 1,184,630 [2] 1,184,630 [2] 1,184,630  
Investment owned, at cost $ 40,093 [6] $ 40,093 [2]                
Investments at fair value $ 0 [6] $ 20,802 [2]             $ 23,548 36,226
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 12.00% [6],[15] 12.00% [2] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [2] 12.00% [2] 12.00%  
Investment, principal $ 3,645 [6],[9],[15] $ 3,332 [2],[5]             $ 2,682  
Investment owned, at cost 3,346 [6],[15] 3,243 [2]                
Investments at fair value $ 1,097 [6],[15] $ 3,332 [2]             $ 2,682 0
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 12.00% [6],[15] 12.00% [2] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [2] 12.00% [2] 12.00%  
Investment, principal $ 19,586 [6],[9],[15] $ 17,907 [2],[5]             $ 17,363  
Investment owned, at cost 17,103 [6],[15] 16,339 [2]                
Investments at fair value $ 5,893 [6],[15] $ 17,907 [2]             $ 17,363 15,874
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 12.00% [6],[15] 12.00% [2] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [2] 12.00% [2] 12.00%  
Investment, principal $ 3,883 [6],[9],[15] $ 3,550 [2],[5]             $ 3,442  
Investment owned, at cost 3,643 [6],[15] 3,500 [2]                
Investments at fair value $ 1,168 [6],[15] $ 3,550 [2]             $ 3,442 1,359
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 12.00% [6],[15] 12.00% [2] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [2] 12.00% [2]    
Investment, principal $ 1,750 [6],[9],[15] $ 1,600 [2],[5]                
Investment owned, at cost 1,648 [6],[15] 1,594 [2]                
Investments at fair value $ 527 [6],[15] $ 1,600 [2]                
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, First Lien Term Loan 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 12.00% [6],[15] 12.00% [1],[2] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [6],[15] 12.00% [1],[2] 12.00% [1],[2]    
Investment, principal $ 1,702 [6],[9],[15] $ 0 [1],[2],[5]                
Investment owned, at cost 1,576 [6],[15] 0 [1],[2]                
Investments at fair value $ 512 [6],[15] 0 [1],[2]                
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, First Lien Term Loan 6                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) [6],[15] 12.00%   12.00% 12.00% 12.00% 12.00%        
Investment, principal [6],[9],[15] $ 816                  
Investment owned, at cost [6],[15] 762                  
Investments at fair value $ 816 [6],[15] 0                
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, First Lien Term Loan 7                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) [6],[15] 12.00%   12.00% 12.00% 12.00% 12.00%        
Investment, principal [6],[9],[15] $ 800                  
Investment owned, at cost [6],[15] 783                  
Investments at fair value $ 800 [6],[15] $ 0                
Investment, Identifier [Axis]: SIO2 Medical Products, Inc., Metal, Glass & Plastic Containers, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 66,686 [6] 66,686 [2] 66,686 [6] 66,686 [6] 66,686 [6] 66,686 [6] 66,686 [2] 66,686 [2] 66,686  
Investment owned, at cost $ 0 [6] $ 0 [2]                
Investments at fair value $ 0 [6] $ 0 [2]             $ 0 0
Investment, Identifier [Axis]: SLF JV 1 Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00%   7.00% 7.00% 7.00% 7.00%        
Investment, Identifier [Axis]: SM Wellness Holdings, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.50%         4.50% 4.50%    
Investment, interest rate (as a percent)   10.01%         10.01% 10.01%    
Investment, principal   $ 2,947                
Investment owned, at cost   2,640                
Investments at fair value   $ 2,888                
Investment, Identifier [Axis]: SM Wellness Holdings, Inc., Health Care Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   4.50%         4.50% 4.50%    
Investment, interest rate (as a percent) [2],[3],[17]   10.01%         10.01% 10.01%    
Investment, principal [2],[5],[17]   $ 4,406                
Investment owned, at cost [2],[17]   3,908                
Investments at fair value [2],[17]   $ 4,318                
Investment, Identifier [Axis]: SM Wellness Holdings, Inc., Health Care Services, Second Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   8.00%         8.00% 8.00%    
Investment, interest rate (as a percent) [2],[3],[17]   13.51%         13.51% 13.51%    
Investment, principal [2],[5],[17]   $ 12,034                
Investment owned, at cost [2],[17]   11,367                
Investments at fair value [2],[17]   $ 11,432                
Investment, Identifier [Axis]: SVP-Singer Holdings Inc., Home Furnishings, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [6] 418,881   418,881 418,881 418,881 418,881        
Investment owned, at cost [6] $ 2,463                  
Investments at fair value [6] $ 2,463                  
Investment, Identifier [Axis]: SVP-Singer Holdings Inc., Home Furnishings, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[16],[17]   8.25%         8.25% 8.25%    
Investment, principal [2],[5],[16],[17]   $ 28,146                
Investment owned, at cost [2],[16],[17]   23,170                
Investments at fair value [2],[16],[17]   $ 8,444                
Investment, Identifier [Axis]: SVP-Singer Holdings Inc., Home Furnishings, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[16],[17]   9.75%         9.75% 9.75%    
Investment, principal [1],[2],[5],[16],[17]   $ 932                
Investment owned, at cost [1],[2],[16],[17]   932                
Investments at fair value [1],[2],[16],[17]   $ 932                
Investment, Identifier [Axis]: Salus Workers' Compensation, LLC, Diversified Financial Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 10.50% [6],[7],[11] 10.00% [1],[2],[17] 10.50% [6],[7],[11] 10.50% [6],[7],[11] 10.50% [6],[7],[11] 10.50% [6],[7],[11] 10.00% [1],[2],[17] 10.00% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[7],[8],[11] 14.82%   14.82% 14.82% 14.82% 14.82%        
Investment, principal $ 2,233 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 2,194 [6],[7],[11] (63) [1],[2],[17]                
Investments at fair value $ 2,047 [6],[7],[11] $ (140) [1],[2],[17]                
Investment, Identifier [Axis]: Salus Workers' Compensation, LLC, Diversified Financial Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 10.50% [6],[11] 10.00% [2],[17] 10.50% [6],[11] 10.50% [6],[11] 10.50% [6],[11] 10.50% [6],[11] 10.00% [2],[17] 10.00% [2],[17]    
Investment, interest rate (as a percent) [2],[3],[17]   14.85%         14.85% 14.85%    
Investment, interest rate, paid in kind (as a percent) [6],[11] 14.83%   14.83% 14.83% 14.83% 14.83%        
Investment, principal $ 22,861 [6],[9],[11] $ 22,107 [2],[5],[17]                
Investment owned, at cost 22,579 [6],[11] 21,656 [2],[17]                
Investments at fair value $ 21,489 [6],[11] $ 21,112 [2],[17]                
Investment, Identifier [Axis]: Salus Workers' Compensation, LLC, Diversified Financial Services, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 991,019 [6] 991,019 [2] 991,019 [6] 991,019 [6] 991,019 [6] 991,019 [6] 991,019 [2] 991,019 [2]    
Investment owned, at cost $ 327 [6] $ 327 [2]                
Investments at fair value $ 0 [6] $ 89 [2]                
Investment, Identifier [Axis]: Saratoga, Diversified Financial Services, Credit Linked Note                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.33% [6],[10],[11],[27] 5.33% [2],[13],[17],[28] 5.33% [6],[10],[11],[27] 5.33% [6],[10],[11],[27] 5.33% [6],[10],[11],[27] 5.33% [6],[10],[11],[27] 5.33% [2],[13],[17],[28] 5.33% [2],[13],[17],[28]    
Investment, interest rate (as a percent) 9.86% [6],[8],[10],[11],[27] 10.18% [2],[3],[13],[17],[28] 9.86% [6],[8],[10],[11],[27] 9.86% [6],[8],[10],[11],[27] 9.86% [6],[8],[10],[11],[27] 9.86% [6],[8],[10],[11],[27] 10.18% [2],[3],[13],[17],[28] 10.18% [2],[3],[13],[17],[28]    
Investment, principal $ 24,500 [6],[9],[10],[11],[27] $ 24,500 [2],[5],[13],[17],[28]                
Investment owned, at cost 24,418 [6],[10],[11],[27] 24,478 [2],[13],[17],[28]                
Investments at fair value $ 24,500 [6],[10],[11],[27] $ 24,478 [2],[13],[17],[28]                
Investment, Identifier [Axis]: Scilex Holding Co, Biotechnology, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [13]   9,307         9,307 9,307    
Investment owned, at cost [13]   $ 78                
Investments at fair value [13]   $ 9                
Investment, Identifier [Axis]: Scilex Holding Co, Pharmaceuticals, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [10] 274   274 274 274 274        
Investment owned, at cost [10] $ 78                  
Investments at fair value [10] $ 2                  
Investment, Identifier [Axis]: Secure Acquisition Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75%   3.75% 3.75% 3.75% 3.75%        
Investment, interest rate (as a percent) 8.05%   8.05% 8.05% 8.05% 8.05%        
Investment, principal $ 3,980                  
Investment owned, at cost 3,971                  
Investments at fair value 3,991                  
Investment, Identifier [Axis]: Secure Acquisition Inc., Paper & Plastic Packaging Products & Materials, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [17]   4.25%         4.25% 4.25%    
Investment, interest rate (as a percent) [3],[17]   8.85%         8.85% 8.85%    
Investment, principal [5],[17]   $ 14,963                
Investment owned, at cost [17]   14,925                
Investments at fair value [17]   15,009                
Investment, Identifier [Axis]: Senior Loan Fund JV I, LLC, Multi-Sector Holdings, Membership Interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, at cost 54,791 [7],[10],[20],[23],[24] 54,791 [1],[13],[22],[25],[26]                
Investments at fair value $ 14,881 [7],[10],[20],[23],[24] $ 22,541 [1],[13],[22],[25],[26]             $ 25,817 28,878
Investment, Identifier [Axis]: Senior Loan Fund JV I, LLC, Multi-Sector Holdings, Subordinated Debt                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[7],[10],[11],[23] 7.00% [1],[2],[13],[17],[25] 7.00% [6],[7],[10],[11],[23] 7.00% [6],[7],[10],[11],[23] 7.00% [6],[7],[10],[11],[23] 7.00% [6],[7],[10],[11],[23] 7.00% [1],[2],[13],[17],[25] 7.00% [1],[2],[13],[17],[25] 7.00%  
Investment, interest rate (as a percent) 11.43% [6],[7],[8],[10],[11],[23] 12.45% [1],[2],[3],[13],[17],[25] 11.43% [6],[7],[8],[10],[11],[23] 11.43% [6],[7],[8],[10],[11],[23] 11.43% [6],[7],[8],[10],[11],[23] 11.43% [6],[7],[8],[10],[11],[23] 12.45% [1],[2],[3],[13],[17],[25] 12.45% [1],[2],[3],[13],[17],[25] 12.44%  
Investment, principal $ 112,656 [6],[7],[9],[10],[11],[23] $ 112,656 [1],[2],[5],[13],[17],[25]             $ 112,656  
Investment owned, at cost 112,656 [6],[7],[10],[11],[23] 112,656 [1],[2],[13],[17],[25]                
Investments at fair value $ 112,656 [6],[7],[10],[11],[23] $ 112,656 [1],[2],[13],[17],[25]             $ 112,656 112,656
Investment, Identifier [Axis]: Seres Therapeutics, Inc., Biotechnology, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 2,911 [6],[10] 58,210 [2],[13] 2,911 [6],[10] 2,911 [6],[10] 2,911 [6],[10] 2,911 [6],[10] 58,210 [2],[13] 58,210 [2],[13]    
Investment owned, at cost $ 182 [6],[10] $ 182 [2],[13]                
Investments at fair value $ 13 [6],[10] $ 29 [2],[13]                
Investment, Identifier [Axis]: Shearer's Foods LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.25% 4.00% 3.25% 3.25% 3.25% 3.25% 4.00% 4.00%    
Investment, interest rate (as a percent) 7.58% 8.85% 7.58% 7.58% 7.58% 7.58% 8.85% 8.85%    
Investment, principal $ 6,930 $ 6,983                
Investment owned, at cost 6,867 6,913                
Investments at fair value $ 6,957 $ 6,996                
Investment, Identifier [Axis]: Shearer's Foods LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.25% 4.00% 3.25% 3.25% 3.25% 3.25% 4.00% 4.00%    
Investment, interest rate (as a percent) 7.58% 8.85% 7.58% 7.58% 7.58% 7.58% 8.85% 8.85%    
Investment, principal $ 2,970 $ 2,993                
Investment owned, at cost 2,943 2,963                
Investments at fair value $ 2,981 $ 2,998                
Investment, Identifier [Axis]: Sierra Enterprises, LLC, Soft Drinks & Non-alcoholic Beverages, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (21)                  
Investments at fair value [6],[7],[11] $ (19)                  
Investment, Identifier [Axis]: Sierra Enterprises, LLC, Soft Drinks & Non-alcoholic Beverages, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 6.00%   6.00% 6.00% 6.00% 6.00%        
Investment, interest rate (as a percent) [6],[8],[11] 10.32%   10.32% 10.32% 10.32% 10.32%        
Investment, principal [6],[9],[11] $ 11,248                  
Investment owned, at cost [6],[11] 11,083                  
Investments at fair value [6],[11] $ 11,096                  
Investment, Identifier [Axis]: Skopima Consilio Parent LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75%   3.75% 3.75% 3.75% 3.75%        
Investment, interest rate (as a percent) 8.08%   8.08% 8.08% 8.08% 8.08%        
Investment, principal $ 3,980                  
Investment owned, at cost 3,956                  
Investments at fair value $ 3,933                  
Investment, Identifier [Axis]: Sorenson Communications, LLC, Communications Equipment, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[7],[11] 5.75% [1],[2],[17] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [1],[2],[17] 5.75% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (82) [6],[7],[11] (98) [1],[2],[17]                
Investments at fair value $ (102) [6],[7],[11] $ (89) [1],[2],[17]                
Investment, Identifier [Axis]: Sorenson Communications, LLC, Communications Equipment, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[11] 5.75% [2],[17] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [2],[17] 5.75% [2],[17]    
Investment, interest rate (as a percent) 10.08% [6],[8],[11] 10.60% [2],[3],[17] 10.08% [6],[8],[11] 10.08% [6],[8],[11] 10.08% [6],[8],[11] 10.08% [6],[8],[11] 10.60% [2],[3],[17] 10.60% [2],[3],[17]    
Investment, principal $ 44,994 [6],[9],[11] $ 47,730 [2],[5],[17]                
Investment owned, at cost 44,310 [6],[11] 46,862 [2],[17]                
Investments at fair value $ 44,148 [6],[11] $ 46,947 [2],[17]                
Investment, Identifier [Axis]: Sorrento Therapeutics, Inc., Biotechnology, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 66,000 [10] 66,000 [13] 66,000 [10] 66,000 [10] 66,000 [10] 66,000 [10] 66,000 [13] 66,000 [13]    
Investment owned, at cost $ 139 [10] $ 139 [13]                
Investments at fair value $ 0 [10] $ 0 [13]                
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.75%         3.75% 3.75%    
Investment, interest rate (as a percent)   8.00%         8.00% 8.00%    
Investment, principal   $ 8,601                
Investment owned, at cost   8,563                
Investments at fair value   $ 8,628                
Investment, Identifier [Axis]: Southern Veterinary Partners, LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.75%         3.75% 3.75%    
Investment, interest rate (as a percent)   8.00%         8.00% 8.00%    
Investment, principal   $ 3,266                
Investment owned, at cost   3,250                
Investments at fair value   $ 3,277                
Investment, Identifier [Axis]: Spanx, LLC, Apparel Retail, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.00% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.00% [1],[2],[17] 5.00% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (25) [6],[7],[11] (32) [1],[2],[17]                
Investments at fair value $ (31) [6],[7],[11] $ (15) [1],[2],[17]                
Investment, Identifier [Axis]: Spanx, LLC, Apparel Retail, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.25% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.25% [2],[17] 5.25% [2],[17]    
Investment, interest rate (as a percent) 9.93% [6],[8],[11] 10.20% [2],[3],[17] 9.93% [6],[8],[11] 9.93% [6],[8],[11] 9.93% [6],[8],[11] 9.93% [6],[8],[11] 10.20% [2],[3],[17] 10.20% [2],[3],[17]    
Investment, principal $ 17,918 [6],[9],[11] $ 18,058 [2],[5],[17]                
Investment owned, at cost 17,794 [6],[11] 17,887 [2],[17]                
Investments at fair value $ 17,739 [6],[11] $ 18,032 [2],[17]                
Investment, Identifier [Axis]: Spruce Bidco I Inc., Health Care Equipment, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (131)                  
Investments at fair value [6],[7],[11] $ (133)                  
Investment, Identifier [Axis]: Spruce Bidco I Inc., Health Care Equipment, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[11] 9.13%   9.13% 9.13% 9.13% 9.13%        
Investment, principal [6],[9],[11] $ 41,137                  
Investment owned, at cost [6],[11] 40,556                  
Investments at fair value [6],[11] $ 40,549                  
Investment, Identifier [Axis]: Spruce Bidco I Inc., Health Care Equipment, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [6],[8],[11] 7.68%   7.68% 7.68% 7.68% 7.68%        
Investment, principal [6],[9],[11]         $ 7,448          
Investment owned, at cost [6],[11] $ 5,070                  
Investments at fair value [6],[11] $ 5,380                  
Investment, Identifier [Axis]: Spruce Bidco I Inc., Health Care Equipment, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.25%   5.25% 5.25% 5.25% 5.25%        
Investment, interest rate (as a percent) [6],[8],[11] 6.02%   6.02% 6.02% 6.02% 6.02%        
Investment, principal | ¥ [6],[9],[11]           ¥ 796,342        
Investment owned, at cost [6],[11] $ 5,070                  
Investments at fair value [6],[11] $ 5,434                  
Investment, Identifier [Axis]: Staples, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment, interest rate (as a percent) 10.03% 10.69% 10.03% 10.03% 10.03% 10.03% 10.69% 10.69%    
Investment, principal $ 4,228 $ 5,349                
Investment owned, at cost 4,092 5,147                
Investments at fair value $ 3,912 $ 4,873                
Investment, Identifier [Axis]: Staples, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment, interest rate (as a percent) 10.03% 10.69% 10.03% 10.03% 10.03% 10.03% 10.69% 10.69%    
Investment, principal $ 1,518 $ 1,918                
Investment owned, at cost 1,469 1,846                
Investments at fair value $ 1,404 $ 1,748                
Investment, Identifier [Axis]: Staples, Inc., Office Services & Supplies, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [11] 5.75% [17] 5.75% [11] 5.75% [11] 5.75% [11] 5.75% [11] 5.75% [17] 5.75% [17]    
Investment, interest rate (as a percent) 10.03% [8],[11] 10.69% [3],[17] 10.03% [8],[11] 10.03% [8],[11] 10.03% [8],[11] 10.03% [8],[11] 10.69% [3],[17] 10.69% [3],[17]    
Investment, principal $ 9,888 [9],[11] $ 13,780 [5],[17]                
Investment owned, at cost 9,571 [11] 13,259 [17]                
Investments at fair value $ 9,150 [11] $ 12,555 [17]                
Investment, Identifier [Axis]: Staples, Inc., Office Services & Supplies, Fixed Rate Bond                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 10.75% [8] 10.75% [3] 10.75% [8] 10.75% [8] 10.75% [8] 10.75% [8] 10.75% [3] 10.75% [3]    
Investment, principal $ 4,835 [9] $ 6,835 [5]                
Investment owned, at cost 4,790 6,771                
Investments at fair value $ 4,600 $ 6,641                
Investment, Identifier [Axis]: Star Parent, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% 3.75% 4.00% 4.00% 4.00% 4.00% 3.75% 3.75%    
Investment, interest rate (as a percent) 8.30% 8.35% 8.30% 8.30% 8.30% 8.30% 8.35% 8.35%    
Investment, principal $ 7,900 $ 7,960                
Investment owned, at cost 7,782 7,841                
Investments at fair value $ 7,833 $ 7,757                
Investment, Identifier [Axis]: Star Parent, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00% 3.75% 4.00% 4.00% 4.00% 4.00% 3.75% 3.75%    
Investment, interest rate (as a percent) 8.30% 8.35% 8.30% 8.30% 8.30% 8.30% 8.35% 8.35%    
Investment, principal $ 3,950 $ 3,980                
Investment owned, at cost 3,891 3,920                
Investments at fair value $ 3,916 $ 3,878                
Investment, Identifier [Axis]: Star Parent, Inc., Life Sciences Tools & Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [11] 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) [8],[11] 8.30%   8.30% 8.30% 8.30% 8.30%        
Investment, principal [9],[11] $ 9,950                  
Investment owned, at cost [11] 9,649                  
Investments at fair value [11] $ 9,865                  
Investment, Identifier [Axis]: SumUp Holdings Luxembourg, Diversified Financial Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.50% [6],[7],[10],[11] 6.50% [1],[2],[13],[17] 6.50% [6],[7],[10],[11] 6.50% [6],[7],[10],[11] 6.50% [6],[7],[10],[11] 6.50% [6],[7],[10],[11] 6.50% [1],[2],[13],[17] 6.50% [1],[2],[13],[17]    
Investment, interest rate (as a percent) 8.54% [6],[7],[8],[10],[11] 10.04% [1],[2],[3],[13],[17] 8.54% [6],[7],[8],[10],[11] 8.54% [6],[7],[8],[10],[11] 8.54% [6],[7],[8],[10],[11] 8.54% [6],[7],[8],[10],[11] 10.04% [1],[2],[3],[13],[17] 10.04% [1],[2],[3],[13],[17]    
Investment, principal   $ 18,846 [1],[2],[5],[13],[17] € 18,846 [6],[7],[9],[10],[11]              
Investment owned, at cost $ 20,199 [6],[7],[10],[11] 20,199 [1],[2],[13],[17]                
Investments at fair value $ 22,122 [6],[7],[10],[11] $ 20,785 [1],[2],[13],[17]                
Investment, Identifier [Axis]: SupplyOne, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.25%         4.25% 4.25%    
Investment, interest rate (as a percent)   9.10%         9.10% 9.10%    
Investment, principal   $ 4,478                
Investment owned, at cost   4,433                
Investments at fair value   $ 4,496                
Investment, Identifier [Axis]: SupplyOne, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.25%         4.25% 4.25%    
Investment, interest rate (as a percent)   9.10%         9.10% 9.10%    
Investment, principal   $ 1,493                
Investment owned, at cost   1,478                
Investments at fair value   $ 1,499                
Investment, Identifier [Axis]: Supreme Fitness Group NY Holdings, LLC, Leisure Facilities, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   7.00%         7.00% 7.00%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   (8)                
Investments at fair value [1],[2],[17]   $ (62)                
Investment, Identifier [Axis]: Supreme Fitness Group NY Holdings, LLC, Leisure Facilities, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   7.00%         7.00% 7.00%    
Investment, interest rate (as a percent) [2],[3],[17]   12.58%         12.58% 12.58%    
Investment, principal [2],[5],[17]   $ 2,721                
Investment owned, at cost [2],[17]   2,706                
Investments at fair value [2],[17]   $ 2,612                
Investment, Identifier [Axis]: Supreme Fitness Group NY Holdings, LLC, Leisure Facilities, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   7.00%         7.00% 7.00%    
Investment, interest rate (as a percent) [2],[3],[17]   12.58%         12.58% 12.58%    
Investment, principal | € [2],[5],[17]             € 3,273      
Investment owned, at cost [2],[17]   $ 3,160                
Investments at fair value [2],[17]   $ 3,142                
Investment, Identifier [Axis]: Supreme Fitness Group NY Holdings, LLC, Leisure Facilities, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   7.00%         7.00% 7.00%    
Investment, interest rate (as a percent) [2],[3],[17]   12.58%         12.58% 12.58%    
Investment, principal [2],[5],[17]   $ 31,778                
Investment owned, at cost [2],[17]   31,612                
Investments at fair value [2],[17]   $ 30,507                
Investment, Identifier [Axis]: Swissport Stratosphere USA LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.25%         4.25% 4.25%    
Investment, interest rate (as a percent)   9.57%         9.57% 9.57%    
Investment, principal   $ 5,486                
Investment owned, at cost   5,459                
Investments at fair value   $ 5,512                
Investment, Identifier [Axis]: Swissport Stratosphere USA LLC, First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   4.25%         4.25% 4.25%    
Investment, interest rate (as a percent)   9.57%         9.57% 9.57%    
Investment, principal   $ 1,995                
Investment owned, at cost   1,985                
Investments at fair value   $ 2,004                
Investment, Identifier [Axis]: Symphone CLO Ltd, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [10],[11] 5.00%   5.00% 5.00% 5.00% 5.00%        
Investment, interest rate (as a percent) [8],[10],[11] 9.27%   9.27% 9.27% 9.27% 9.27%        
Investment, principal [9],[10],[11] $ 2,000                  
Investment owned, at cost [10],[11] 2,000                  
Investments at fair value [10],[11] $ 1,974                  
Investment, Identifier [Axis]: TBRS, Inc., Health Care Supplies, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, interest rate (as a percent) [6],[7],[8],[11] 9.08%   9.08% 9.08% 9.08% 9.08%        
Investment, principal [6],[7],[9],[11] $ 144                  
Investment owned, at cost [6],[7],[11] 123                  
Investments at fair value [6],[7],[11] $ 121                  
Investment, Identifier [Axis]: TBRS, Inc., Health Care Supplies, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, interest rate (as a percent) [6],[8],[11] 9.08%   9.08% 9.08% 9.08% 9.08%        
Investment, principal [6],[9],[11] $ 16,872                  
Investment owned, at cost [6],[11] 16,732                  
Investments at fair value [6],[11] $ 16,703                  
Investment, Identifier [Axis]: TBRS, Inc., Health Care Supplies, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 4.75%   4.75% 4.75% 4.75% 4.75%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (27)                  
Investments at fair value [6],[7],[11] $ (21)                  
Investment, Identifier [Axis]: THL Zinc Ventures Ltd, Diversified Metals & Mining, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [2],[3],[13]   13.00%         13.00% 13.00%    
Investment, principal [2],[5],[13]   $ 50,419                
Investment owned, at cost [2],[13]   50,061                
Investments at fair value [2],[13]   $ 50,419                
Investment, Identifier [Axis]: TMS International Corp, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.50%   3.50% 3.50% 3.50% 3.50%        
Investment, interest rate (as a percent) 7.83%   7.83% 7.83% 7.83% 7.83%        
Investment, principal $ 4,990                  
Investment owned, at cost 5,008                  
Investments at fair value $ 5,002                  
Investment, Identifier [Axis]: Tecta America Corp, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.00%   3.00% 3.00% 3.00% 3.00%        
Investment, interest rate (as a percent) 7.33%   7.33% 7.33% 7.33% 7.33%        
Investment, principal $ 5,000                  
Investment owned, at cost 5,012                  
Investments at fair value $ 5,017                  
Investment, Identifier [Axis]: Telephone and Data Systems, Inc., Wireless Telecommunication Services, Subordinated Debt Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[10],[11] 7.00% [2],[13],[17] 7.00% [6],[10],[11] 7.00% [6],[10],[11] 7.00% [6],[10],[11] 7.00% [6],[10],[11] 7.00% [2],[13],[17] 7.00% [2],[13],[17]    
Investment, interest rate (as a percent) 11.26% [6],[8],[10],[11] 12.25% [2],[3],[13],[17] 11.26% [6],[8],[10],[11] 11.26% [6],[8],[10],[11] 11.26% [6],[8],[10],[11] 11.26% [6],[8],[10],[11] 12.25% [2],[3],[13],[17] 12.25% [2],[3],[13],[17]    
Investment, principal $ 24,843 [6],[9],[10],[11] $ 25,031 [2],[5],[13],[17]                
Investment owned, at cost 24,272 [6],[10],[11] 24,343 [2],[13],[17]                
Investments at fair value $ 24,843 [6],[10],[11] $ 24,405 [2],[13],[17]                
Investment, Identifier [Axis]: Telephone and Data Systems, Inc., Wireless Telecommunication Services, Subordinated Debt Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.00% [6],[7],[10],[11] 7.00% [1],[2],[13],[17] 7.00% [6],[7],[10],[11] 7.00% [6],[7],[10],[11] 7.00% [6],[7],[10],[11] 7.00% [6],[7],[10],[11] 7.00% [1],[2],[13],[17] 7.00% [1],[2],[13],[17]    
Investment, principal $ 0 [6],[7],[9],[10],[11] $ 0 [1],[2],[5],[13],[17]                
Investment owned, at cost (72) [6],[7],[10],[11] (86) [1],[2],[13],[17]                
Investments at fair value $ 0 [6],[7],[10],[11] (94) [1],[2],[13],[17]                
Investment, Identifier [Axis]: Telestream 2 LLC, Application Software, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [6] 744,491   744,491 744,491 744,491 744,491        
Investment owned, at cost [6] $ 7,207                  
Investments at fair value $ 7,207 [6] 0                
Investment, Identifier [Axis]: Telestream 2 LLC, Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 8.25%   8.25% 8.25% 8.25% 8.25%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] 0                  
Investments at fair value $ 0 [6],[7],[11] 0                
Investment, Identifier [Axis]: Telestream 2 LLC, Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 6.25%   6.25% 6.25% 6.25% 6.25%        
Investment, interest rate (as a percent) [6],[8],[11] 10.54%   10.54% 10.54% 10.54% 10.54%        
Investment, principal [6],[9],[11] $ 17,123                  
Investment owned, at cost [6],[11] 17,123                  
Investments at fair value $ 17,123 [6],[11] $ 0                
Investment, Identifier [Axis]: Telestream Holdings Corporation, Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[16],[17]   9.75%         9.75% 9.75%    
Investment, principal [1],[2],[5],[16],[17]   $ 1,946                
Investment owned, at cost [1],[2],[16],[17]   1,918                
Investments at fair value [1],[2],[16],[17]   $ 1,727                
Investment, Identifier [Axis]: Telestream Holdings Corporation, Application Software, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[16],[17]   9.75%         9.75% 9.75%    
Investment, principal [2],[5],[16],[17]   $ 26,553                
Investment owned, at cost [2],[16],[17]   25,237                
Investments at fair value [2],[16],[17]   $ 23,898                
Investment, Identifier [Axis]: Ten-X LLC, Interactive Media & Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.00% [11] 6.00% [2],[17] 6.00% [11] 6.00% [11] 6.00% [11] 6.00% [11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, interest rate (as a percent) 10.25% [8],[11] 10.74% [2],[3],[17] 10.25% [8],[11] 10.25% [8],[11] 10.25% [8],[11] 10.25% [8],[11] 10.74% [2],[3],[17] 10.74% [2],[3],[17]    
Investment, principal $ 19,525 [9],[11] $ 19,683 [2],[5],[17]                
Investment owned, at cost 18,955 [11] 18,960 [2],[17]                
Investments at fair value $ 17,792 [11] $ 18,837 [2],[17]                
Investment, Identifier [Axis]: The Avery, Real Estate Operating Companies, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[15] 10.00% [2],[16] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [2],[16] 10.00% [2],[16] 10.00%  
Investment, principal $ 5,236 [6],[9],[15] $ 5,065 [2],[5],[16]             $ 5,065  
Investment owned, at cost 4,150 [6],[15] 4,657 [2],[16]                
Investments at fair value $ 3,391 [6],[15] $ 4,087 [2],[16]             $ 4,112 0
Investment, Identifier [Axis]: The Avery, Real Estate Operating Companies, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate, paid in kind (as a percent) 10.00% [6],[15] 10.00% [2],[16] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [6],[15] 10.00% [2],[16] 10.00% [2],[16] 10.00%  
Investment, principal $ 21,622 [6],[9],[15] $ 20,917 [2],[5],[16]             $ 20,917  
Investment owned, at cost 17,167 [6],[15] 19,262 [2],[16]                
Investments at fair value 15,241 [6],[15] 18,235 [2],[16]             18,421 0
Investment, Identifier [Axis]: The Avery, Real Estate Operating Companies, Membership Interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal 0               0  
Investment owned, at cost 0 [6] 0 [2]                
Investments at fair value $ 0 [6] $ 0 [2]             $ 0 $ 0
Investment, Identifier [Axis]: Thrasio, LLC, Broadline Retail, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 321,058 [6] 321,058 [2] 321,058 [6] 321,058 [6] 321,058 [6] 321,058 [6] 321,058 [2] 321,058 [2]    
Investment, principal [2],[5]   $ 0                
Investment owned, at cost $ 0 [6] 0 [2]                
Investments at fair value $ 0 [6] $ 0 [2]                
Investment, Identifier [Axis]: Thrasio, LLC, Broadline Retail, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 10.00% [6],[11] 10.00% [2],[17] 10.00% [6],[11] 10.00% [6],[11] 10.00% [6],[11] 10.00% [6],[11] 10.00% [2],[17] 10.00% [2],[17]    
Investment, interest rate, paid in kind (as a percent) 14.44% [6],[11] 15.54% [2],[17] 14.44% [6],[11] 14.44% [6],[11] 14.44% [6],[11] 14.44% [6],[11] 15.54% [2],[17] 15.54% [2],[17]    
Investment, principal $ 7,052 [6],[9],[11] $ 6,141 [2],[5],[17]                
Investment owned, at cost 6,893 [6],[11] 5,952 [2],[17]                
Investments at fair value $ 6,717 [6],[11] $ 6,018 [2],[17]                
Investment, Identifier [Axis]: Thrasio, LLC, Broadline Retail, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 10.00% [6],[11],[15] 10.00% [2],[16],[17] 10.00% [6],[11],[15] 10.00% [6],[11],[15] 10.00% [6],[11],[15] 10.00% [6],[11],[15] 10.00% [2],[16],[17] 10.00% [2],[16],[17]    
Investment, principal $ 21,640 [6],[9],[11],[15] $ 18,844 [2],[5],[16],[17]                
Investment owned, at cost 16,279 [6],[11],[15] 16,279 [2],[16],[17]                
Investments at fair value $ 14,715 [6],[11],[15] $ 16,536 [2],[16],[17]                
Investment, Identifier [Axis]: Touchstone Acquisition, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent)   10.95%         10.95% 10.95%    
Investment, principal   $ 7,139                
Investment owned, at cost   7,052                
Investments at fair value   $ 6,996                
Investment, Identifier [Axis]: Touchstone Acquisition, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent)   10.95%         10.95% 10.95%    
Investment, principal   $ 8                
Investment owned, at cost   7                
Investments at fair value   $ 7                
Investment, Identifier [Axis]: Touchstone Acquisition, Inc., Health Care Supplies, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   6.00%         6.00% 6.00%    
Investment, interest rate (as a percent) [2],[3],[17]   10.95%         10.95% 10.95%    
Investment, principal [2],[5],[17]   $ 14,508                
Investment owned, at cost [2],[17]   14,426                
Investments at fair value [2],[17]   $ 14,218                
Investment, Identifier [Axis]: Trident TPI Holdings, Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75% 4.00% 3.75% 3.75% 3.75% 3.75% 4.00% 4.00%    
Investment, interest rate (as a percent) 8.05% 8.60% 8.05% 8.05% 8.05% 8.05% 8.60% 8.60%    
Investment, principal $ 7,444 $ 7,481                
Investment owned, at cost 7,444 7,481                
Investments at fair value $ 7,324 $ 7,502                
Investment, Identifier [Axis]: Trident TPI Holdings, Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 3.75% 4.00% 3.75% 3.75% 3.75% 3.75% 4.00% 4.00%    
Investment, interest rate (as a percent) 8.05% 8.60% 8.05% 8.05% 8.05% 8.05% 8.60% 8.60%    
Investment, principal $ 2,481 $ 2,494                
Investment owned, at cost 2,481 2,494                
Investments at fair value $ 2,441 $ 2,502                
Investment, Identifier [Axis]: Trinitas CLO VI Ltd., Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.08% [10],[11] 7.08% [13],[17] 7.08% [10],[11] 7.08% [10],[11] 7.08% [10],[11] 7.08% [10],[11] 7.08% [13],[17] 7.08% [13],[17]    
Investment, interest rate (as a percent) 11.36% [8],[10],[11] 12.36% [3],[13],[17] 11.36% [8],[10],[11] 11.36% [8],[10],[11] 11.36% [8],[10],[11] 11.36% [8],[10],[11] 12.36% [3],[13],[17] 12.36% [3],[13],[17]    
Investment, principal $ 905 [9],[10],[11] $ 905 [5],[13],[17]                
Investment owned, at cost 854 [10],[11] 852 [13],[17]                
Investments at fair value $ 878 [10],[11] $ 856 [13],[17]                
Investment, Identifier [Axis]: Trinitas CLO XV DAC, Multi-Sector Holdings, CLO Notes                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.71% [10],[11] 7.71% [13],[17] 7.71% [10],[11] 7.71% [10],[11] 7.71% [10],[11] 7.71% [10],[11] 7.71% [13],[17] 7.71% [13],[17]    
Investment, interest rate (as a percent) 11.98% [8],[10],[11] 12.99% [3],[13],[17] 11.98% [8],[10],[11] 11.98% [8],[10],[11] 11.98% [8],[10],[11] 11.98% [8],[10],[11] 12.99% [3],[13],[17] 12.99% [3],[13],[17]    
Investment, principal $ 1,000 [9],[10],[11] $ 1,000 [5],[13],[17]                
Investment owned, at cost 832 [10],[11] 824 [13],[17]                
Investments at fair value $ 972 [10],[11] $ 978 [13],[17]                
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Construction Machinery & Heavy Transportation Equipment, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   5.75%         5.75% 5.75%    
Investment, interest rate (as a percent) [1],[2],[3],[17]   10.85%         10.85% 10.85%    
Investment, principal [1],[2],[5],[17]   $ 29                
Investment owned, at cost [1],[2],[17]   (23)                
Investments at fair value [1],[2],[17]   $ 29                
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Construction Machinery & Heavy Transportation Equipment, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[11] 5.75% [2],[17] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [2],[17] 5.75% [2],[17]    
Investment, interest rate (as a percent) 10.03% [6],[8],[11] 10.86% [2],[3],[17] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 10.86% [2],[3],[17] 10.86% [2],[3],[17]    
Investment, principal $ 31,103 [6],[9],[11] $ 26,457 [2],[5],[17]                
Investment owned, at cost 30,621 [6],[11] 25,976 [2],[17]                
Investments at fair value $ 30,792 [6],[11] $ 26,457 [2],[17]                
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Construction Machinery & Heavy Transportation Equipment, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[11] 5.75% [1],[2],[17] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [1],[2],[17] 5.75% [1],[2],[17]    
Investment, interest rate (as a percent) [6],[8],[11] 10.06%   10.06% 10.06% 10.06% 10.06%        
Investment, principal $ 565 [6],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost 559 [6],[11] (52) [1],[2],[17]                
Investments at fair value $ 559 [6],[11] $ 0 [1],[2],[17]                
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Construction Machinery & Heavy Transportation Equipment, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.75%   5.75% 5.75% 5.75% 5.75%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (20)                  
Investments at fair value [6],[7],[11] $ (27)                  
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Construction Machinery & Heavy Transportation Equipment, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.75%   5.75% 5.75% 5.75% 5.75%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (18)                  
Investments at fair value [6],[7],[11] $ (9)                  
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Construction Machinery & Heavy Transportation Equipment, First Lien Term Loan 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.75%   5.75% 5.75% 5.75% 5.75%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (41)                  
Investments at fair value [6],[7],[11] $ (54)                  
Investment, Identifier [Axis]: Truck-Lite Co., LLC, Construction Machinery & Heavy Transportation Equipment, First Lien Term Loan 6                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[7],[11] 5.75%   5.75% 5.75% 5.75% 5.75%        
Investment, principal [6],[7],[9],[11] $ 0                  
Investment owned, at cost [6],[7],[11] (47)                  
Investments at fair value [6],[7],[11] $ (32)                  
Investment, Identifier [Axis]: USIC Holdings, Inc., Diversified Support Services, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.25% [6],[7],[11] 5.25% [1],[2],[17] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [6],[7],[11] 5.25% [1],[2],[17] 5.25% [1],[2],[17]    
Investment, interest rate (as a percent) 9.58% [6],[7],[8],[11] 10.10% [1],[2],[3],[17] 9.58% [6],[7],[8],[11] 9.58% [6],[7],[8],[11] 9.58% [6],[7],[8],[11] 9.58% [6],[7],[8],[11] 10.10% [1],[2],[3],[17] 10.10% [1],[2],[3],[17]    
Investment, principal $ 917 [6],[7],[9],[11] $ 975 [1],[2],[5],[17]                
Investment owned, at cost 900 [6],[7],[11] 955 [1],[2],[17]                
Investments at fair value $ 917 [6],[7],[11] $ 955 [1],[2],[17]                
Investment, Identifier [Axis]: USIC Holdings, Inc., Diversified Support Services, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[11] 5.50% [2],[17] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [6],[11] 5.50% [2],[17] 5.50% [2],[17]    
Investment, interest rate (as a percent) 9.83% [6],[8],[11] 10.35% [2],[3],[17] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 9.83% [6],[8],[11] 10.35% [2],[3],[17] 10.35% [2],[3],[17]    
Investment, principal $ 15,694 [6],[9],[11] $ 15,773 [2],[5],[17]                
Investment owned, at cost 15,555 [6],[11] 15,617 [2],[17]                
Investments at fair value $ 15,694 [6],[11] $ 15,618 [2],[17]                
Investment, Identifier [Axis]: USIC Holdings, Inc., Diversified Support Services, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [6],[7],[11] 5.50% [1],[2],[17] 5.50% [1],[2],[17]    
Investment, interest rate (as a percent) 9.83% [6],[7],[8],[11] 10.35% [1],[2],[3],[17] 9.83% [6],[7],[8],[11] 9.83% [6],[7],[8],[11] 9.83% [6],[7],[8],[11] 9.83% [6],[7],[8],[11] 10.35% [1],[2],[3],[17] 10.35% [1],[2],[3],[17]    
Investment, principal $ 314 [6],[7],[9],[11] $ 24 [1],[2],[5],[17]                
Investment owned, at cost 314 [6],[7],[11] 24 [1],[2],[17]                
Investments at fair value $ 314 [6],[7],[11] $ 15 [1],[2],[17]                
Investment, Identifier [Axis]: Verde Purchaser, LLC, First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 4.00%   4.00% 4.00% 4.00% 4.00%        
Investment, interest rate (as a percent) 8.30%   8.30% 8.30% 8.30% 8.30%        
Investment, principal $ 4,987                  
Investment owned, at cost 5,003                  
Investments at fair value $ 5,011                  
Investment, Identifier [Axis]: Verona Pharma, Inc., Pharmaceuticals, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 9.70% [6],[8],[10] 11.00% [2],[3],[13] 9.70% [6],[8],[10] 9.70% [6],[8],[10] 9.70% [6],[8],[10] 9.70% [6],[8],[10] 11.00% [2],[3],[13] 11.00% [2],[3],[13]    
Investment, principal $ 2,512 [6],[9],[10] $ 2,512 [2],[5],[13]                
Investment owned, at cost 2,473 [6],[10] 2,466 [2],[13]                
Investments at fair value $ 2,512 [6],[10] $ 2,468 [2],[13]                
Investment, Identifier [Axis]: Verona Pharma, Inc., Pharmaceuticals, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) 9.70% [6],[8],[10] 11.00% [2],[3],[13] 9.70% [6],[8],[10] 9.70% [6],[8],[10] 9.70% [6],[8],[10] 9.70% [6],[8],[10] 11.00% [2],[3],[13] 11.00% [2],[3],[13]    
Investment, principal $ 3,198 [6],[9],[10] $ 3,198 [2],[5],[13]                
Investment owned, at cost 3,134 [6],[10] 3,134 [2],[13]                
Investments at fair value $ 3,198 [6],[10] 3,142 [2],[13]                
Investment, Identifier [Axis]: Verona Pharma, Inc., Pharmaceuticals, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [6],[8],[10] 9.70%   9.70% 9.70% 9.70% 9.70%        
Investment, principal $ 3,426 [6],[9],[10] 0 [1],[2],[5],[13]                
Investment owned, at cost 3,357 [6],[10] 0 [1],[2],[13]                
Investments at fair value $ 3,366 [6],[10] 0 [1],[2],[13]                
Investment, Identifier [Axis]: Verona Pharma, Inc., Pharmaceuticals, First Lien Term Loan 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, interest rate (as a percent) [6],[7],[8],[10] 11.00%   11.00% 11.00% 11.00% 11.00%        
Investment, principal $ 0 [6],[7],[9],[10] 0 [1],[2],[5],[13]                
Investment owned, at cost 0 [6],[7],[10] 0 [1],[2],[13]                
Investments at fair value $ 0 [6],[7],[10] 0 [1],[2],[13]                
Investment, Identifier [Axis]: Verona Pharma, Inc., Pharmaceuticals, First Lien Term Loan 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal [2],[5],[13],[14]   4,652                
Investment owned, at cost [2],[13],[14]   4,652                
Investments at fair value [2],[13],[14]   4,699                
Investment, Identifier [Axis]: Verona Pharma, Inc., Pharmaceuticals, First Lien Term Loan 6                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, principal [1],[2],[5],[13],[14]   0                
Investment owned, at cost [1],[2],[13],[14]   0                
Investments at fair value [1],[2],[13],[14]   $ 0                
Investment, Identifier [Axis]: WP CPP Holdings, LLC, Aerospace & Defense, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.25% [6],[7],[11] 6.75% [1],[2],[17] 7.25% [6],[7],[11] 7.25% [6],[7],[11] 7.25% [6],[7],[11] 7.25% [6],[7],[11] 6.75% [1],[2],[17] 6.75% [1],[2],[17]    
Investment, principal $ 0 [6],[7],[9],[11] $ 0 [1],[2],[5],[17]                
Investment owned, at cost (60) [6],[7],[11] (70) [1],[2],[17]                
Investments at fair value $ 0 [6],[7],[11] $ (19) [1],[2],[17]                
Investment, Identifier [Axis]: WP CPP Holdings, LLC, Aerospace & Defense, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.25% [6],[11] 7.50% [2],[17] 7.25% [6],[11] 7.25% [6],[11] 7.25% [6],[11] 7.25% [6],[11] 7.50% [2],[17] 7.50% [2],[17]    
Investment, interest rate (as a percent) 11.57% [6],[8],[11] 8.39% [2],[3],[17] 11.57% [6],[8],[11] 11.57% [6],[8],[11] 11.57% [6],[8],[11] 11.57% [6],[8],[11] 8.39% [2],[3],[17] 8.39% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) [2],[17]   4.13%         4.13% 4.13%    
Investment, principal $ 30,983 [6],[9],[11] $ 30,570 [2],[5],[17]                
Investment owned, at cost 30,442 [6],[11] 29,933 [2],[17]                
Investments at fair value $ 30,983 [6],[11] $ 30,396 [2],[17]                
Investment, Identifier [Axis]: WP CPP Holdings, LLC, Aerospace & Defense, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 7.25% [6],[11] 7.50% [2],[17] 7.25% [6],[11] 7.25% [6],[11] 7.25% [6],[11] 7.25% [6],[11] 7.50% [2],[17] 7.50% [2],[17]    
Investment, interest rate (as a percent) 11.57% [6],[8],[11] 8.39% [2],[3],[17] 11.57% [6],[8],[11] 11.57% [6],[8],[11] 11.57% [6],[8],[11] 11.57% [6],[8],[11] 8.39% [2],[3],[17] 8.39% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) [2],[17]   4.13%         4.13% 4.13%    
Investment, principal $ 1,468 [6],[9],[11] $ 1,449 [2],[5],[17]                
Investment owned, at cost 1,468 [6],[11] 1,449 [2],[17]                
Investments at fair value $ 1,468 [6],[11] $ 1,448 [2],[17]                
Investment, Identifier [Axis]: Werner Finco LP, Building Products, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [6],[11] 5.50%   5.50% 5.50% 5.50% 5.50%        
Investment, interest rate (as a percent) [6],[8],[11] 9.82%   9.82% 9.82% 9.82% 9.82%        
Investment, principal [6],[9],[11] $ 12,814                  
Investment owned, at cost [6],[11] 12,623                  
Investments at fair value [6],[11] $ 12,622                  
Investment, Identifier [Axis]: Win Brands Group LLC, Housewares & Specialties, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 14.00% [6],[11] 14.00% [2],[17] 14.00% [6],[11] 14.00% [6],[11] 14.00% [6],[11] 14.00% [6],[11] 14.00% [2],[17] 14.00% [2],[17]    
Investment, interest rate (as a percent) 13.32% [6],[8],[11] 12.85% [2],[3],[17] 13.32% [6],[8],[11] 13.32% [6],[8],[11] 13.32% [6],[8],[11] 13.32% [6],[8],[11] 12.85% [2],[3],[17] 12.85% [2],[3],[17]    
Investment, interest rate, paid in kind (as a percent) 5.00% [6],[11] 6.00% [2],[17] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 5.00% [6],[11] 6.00% [2],[17] 6.00% [2],[17]    
Investment, principal $ 2,588 [6],[9],[11] $ 2,782 [2],[5],[17]                
Investment owned, at cost 2,583 [6],[11] 2,760 [2],[17]                
Investments at fair value $ 2,348 [6],[11] $ 2,546 [2],[17]                
Investment, Identifier [Axis]: Win Brands Group LLC, Housewares & Specialties, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 4,871 [6] 4,871 [2] 4,871 [6] 4,871 [6] 4,871 [6] 4,871 [6] 4,871 [2] 4,871 [2]    
Investment owned, at cost $ 46 [6] $ 46 [2]                
Investments at fair value $ 0 [6] $ 0 [2]                
Investment, Identifier [Axis]: Win Brands Group LLC, Integrated Telecommunication Services, Common Stock                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares [2]   127,452         127,452 127,452    
Investment owned, at cost [2]   $ 2,057                
Investments at fair value [2]   $ 1,657                
Investment, Identifier [Axis]: X Holdings Corp., Interactive Media & Services, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [11] 6.50%   6.50% 6.50% 6.50% 6.50%        
Investment, interest rate (as a percent) [8],[11] 10.93%   10.93% 10.93% 10.93% 10.93%        
Investment, principal [9],[11] $ 6,252                  
Investment owned, at cost [11] 6,206                  
Investments at fair value [11] $ 6,120                  
Investment, Identifier [Axis]: Zep Inc., Specialty Chemicals, First Lien Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [2],[17]   4.00%         4.00% 4.00%    
Investment, interest rate (as a percent) [2],[3],[17]   8.25%         8.25% 8.25%    
Investment, principal [2],[5],[17]   $ 19,431                
Investment owned, at cost [2],[17]   19,407                
Investments at fair value [2],[17]   $ 19,431                
Investment, Identifier [Axis]: athenahealth Group Inc., First Lien Term Loan | SLF JV I                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.25%         3.25% 3.25%    
Investment, interest rate (as a percent)   8.10%         8.10% 8.10%    
Investment, principal   $ 9,034                
Investment owned, at cost   8,790                
Investments at fair value   $ 8,992                
Investment, Identifier [Axis]: athenahealth Group Inc., First Lien Term Loan | Glick JV LLC                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent)   3.25%         3.25% 3.25%    
Investment, interest rate (as a percent)   8.10%         8.10% 8.10%    
Investment, principal   $ 2,942                
Investment owned, at cost   2,850                
Investments at fair value   $ 2,929                
Investment, Identifier [Axis]: athenahealth Group Inc., Health Care Technology, Preferred Equity                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 21,523 [6] 21,523 [2] 21,523 [6] 21,523 [6] 21,523 [6] 21,523 [6] 21,523 [2] 21,523 [2]    
Investment owned, at cost $ 20,789 [6] $ 20,789 [2]                
Investments at fair value $ 30,096 [6] $ 24,326 [2]                
Investment, Identifier [Axis]: iCIMs, Inc., Application Software, First Lien Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[7],[11] 5.75% [1],[2],[17] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [6],[7],[11] 5.75% [1],[2],[17] 5.75% [1],[2],[17]    
Investment, interest rate (as a percent) 10.03% [6],[7],[8],[11] 10.67% [1],[2],[3],[17] 10.03% [6],[7],[8],[11] 10.03% [6],[7],[8],[11] 10.03% [6],[7],[8],[11] 10.03% [6],[7],[8],[11] 10.67% [1],[2],[3],[17] 10.67% [1],[2],[3],[17]    
Investment, principal $ 339 [6],[7],[9],[11] $ 678 [1],[2],[5],[17]                
Investment owned, at cost 310 [6],[7],[11] 643 [1],[2],[17]                
Investments at fair value $ 275 [6],[7],[11] $ 607 [1],[2],[17]                
Investment, Identifier [Axis]: iCIMs, Inc., Application Software, First Lien Term Loan 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 5.75% [6],[11] 5.75% [2],[17] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [6],[11] 5.75% [2],[17] 5.75% [2],[17]    
Investment, interest rate (as a percent) 10.03% [6],[8],[11] 10.67% [2],[3],[17] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 10.03% [6],[8],[11] 10.67% [2],[3],[17] 10.67% [2],[3],[17]    
Investment, principal $ 25,511 [6],[9],[11] $ 25,491 [2],[5],[17]                
Investment owned, at cost 25,331 [6],[11] 25,261 [2],[17]                
Investments at fair value $ 24,794 [6],[11] $ 24,696 [2],[17]                
Investment, Identifier [Axis]: iCIMs, Inc., Application Software, First Lien Term Loan 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) 6.25% [6],[11] 6.25% [2],[17] 6.25% [6],[11] 6.25% [6],[11] 6.25% [6],[11] 6.25% [6],[11] 6.25% [2],[17] 6.25% [2],[17]    
Investment, interest rate (as a percent) 10.53% [6],[8],[11] 11.17% [2],[3],[17] 10.53% [6],[8],[11] 10.53% [6],[8],[11] 10.53% [6],[8],[11] 10.53% [6],[8],[11] 11.17% [2],[3],[17] 11.17% [2],[3],[17]    
Investment, principal $ 3,636 [6],[9],[11] $ 3,636 [2],[5],[17]                
Investment owned, at cost 3,614 [6],[11] 3,609 [2],[17]                
Investments at fair value $ 3,587 [6],[11] $ 3,581 [2],[17]                
Investment, Identifier [Axis]: iCIMs, Inc., Application Software, First Lien Term Loan 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment, basis spread, variable rate (as a percent) [1],[2],[17]   6.25%         6.25% 6.25%    
Investment, principal [1],[2],[5],[17]   $ 0                
Investment owned, at cost [1],[2],[17]   0                
Investments at fair value [1],[2],[17]   $ 0                
Investment, Identifier [Axis]: scPharmaceuticals Inc., Pharmaceuticals, Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Investment owned, balance (in shares) | shares 53,700 [6] 53,700 [2] 53,700 [6] 53,700 [6] 53,700 [6] 53,700 [6] 53,700 [2] 53,700 [2]    
Investment owned, at cost $ 175 [6] $ 175 [2]                
Investments at fair value $ 81 [6] $ 121 [2]                
[1] Investment had undrawn commitments. Unamortized fees are classified as unearned income which reduces cost basis, which may result in a negative cost basis. A negative fair value may result from the unfunded commitment being valued below par.
[2] As of September 30, 2024, these investments were categorized as Level 3 within the fair value hierarchy established by ASC 820.
[3] Interest rates may be adjusted from period to period on certain term loans and revolvers. These rate adjustments may be either temporary in nature due to tier pricing arrangements or financial or payment covenant violations in the original credit agreements or permanent in nature per loan amendment or waiver documents.
[4] This investment represents a participation interest in the underlying securities shown.
[5] Principal includes accumulated PIK interest and is net of repayments, if any. “£” signifies the investment is denominated in British Pounds. "€" signifies the investment is denominated in Euros. All other investments are denominated in U.S. dollars.
[6] As of June 30, 2025, these investments were categorized as Level 3 within the fair value hierarchy established by Financial Accounting Standards Board ("FASB") guidance under Accounting Standards Codification ("ASC") Topic 820, Fair Value Measurements and Disclosures ("ASC 820").
[7] Investment had undrawn commitments. Unamortized fees are classified as unearned income which reduces cost basis, which may result in a negative cost basis. A negative fair value may result from the unfunded commitment being valued below par.
[8] Interest rates may be adjusted from period to period on certain term loans and revolvers. These rate adjustments may be either temporary in nature due to tier pricing arrangements or financial or payment covenant violations in the original credit agreements or permanent in nature per loan amendment or waiver documents.
[9] Principal includes accumulated payment in kind ("PIK") interest and is net of repayments, if any. “£” signifies the investment is denominated in British Pounds. "€" signifies the investment is denominated in Euros. "C$" signifies the investment is denominated in Canadian dollar. "¥" signifies the investment is denominated in Japanese Yen. All other investments are denominated in U.S. dollars.
[10] Investment is not a "qualifying asset" as defined 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 the acquisition is made, qualifying assets represent at least 70% of the Company's total assets. As of June 30, 2025, qualifying assets represented 73.0% of the Company's total assets and non-qualifying assets represented 27.0% of the Company's total assets.
[11] The interest rate on the principal balance outstanding for most of the floating rate loans is indexed to the secured overnight financing rate ("SOFR"), the euro interbank offered rate ("EURIBOR" or "E"), the sterling overnight index average ("SONIA") and/or an alternate base rate (e.g., prime rate), which typically resets semi-annually, quarterly, or monthly at the borrower's option. The borrower may also elect to have multiple interest reset periods for each loan. For each of these loans, the Company has provided the applicable margin over the reference rate based on each respective credit agreement and the cash interest rate as of period end. As of June 30, 2025, the reference rates for the Company's variable rate loans were the 30-day SOFR at 4.32%, the 90-day SOFR at 4.29%, the 180-day SOFR at 4.15%, the PRIME at 7.50%, the SONIA at 4.32%, the Tokyo Overnight Average Rate ("TONA") at 0.75%, the 30-day Canadian Overnight Repo Rate Average ("CORRA") at 2.75%, the 30-day EURIBOR at 1.93%, the 90-day EURIBOR at 1.94% and the 180-day EURIBOR at 2.05%. Most loans include an interest floor, which generally ranges from 0% to 3.00%. SOFR and SONIA based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread.
[12] This investment represents a revenue interest financing term loan in which the Company receives periodic interest payments based on a percentage of revenues earned at the respective portfolio company over the life of the loan.
[13] Investment is not a "qualifying asset" as defined 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 the acquisition is made, qualifying assets represent at least 70% of the Company's total assets. As of September 30, 2024, qualifying assets represented 74.4% of the Company's total assets and non-qualifying assets represented 25.6% of the Company's total assets.
[14] This investment represents a revenue interest financing term loan in which the Company receives periodic interest payments based on a percentage of revenues earned at the respective portfolio company over the life of the loan.
[15] This investment was on non-accrual status as of June 30, 2025.
[16] This investment was on non-accrual status as of September 30, 2024.
[17] The interest rate on the principal balance outstanding for most of the floating rate loans is indexed to SOFR, EURIBOR, SONIA and/or an alternate base rate (e.g., prime rate), which typically resets semi-annually, quarterly, or monthly at the borrower's option. The borrower may also elect to have multiple interest reset periods for each loan. For each of these loans, the Company has provided the applicable margin over the reference rate based on each respective credit agreement and the cash interest rate as of period end. As of September 30, 2024, the reference rates for the Company's variable rate loans were the 30-day SOFR at 4.85%, the 90-day SOFR at 4.59%, the 180-day SOFR at 4.25%, the PRIME at 8.00%, the SONIA at 5.50%, the 90-day EURIBOR at 3.54% and the 180-day EURIBOR at 3.11%. Most loans include an interest floor, which generally ranges from 0% to 3.00%. SOFR and SONIA based contracts may include a credit spread adjustment that is charged in addition to the base rate and the stated spread.
[18] This investment represents Seller Earn Out Shares in Alvotech Holdings S.A. The Seller Earn Out Shares will vest if, at any time through June 16, 2027, the Alvotech Holdings S.A. common share price is at or above a volume weighted average price ("VWAP") of $20.00 per share for any ten trading days within any twenty trading day period.
[19] This investment represents Seller Earn Out Shares in Alvotech Holdings S.A. The Seller Earn Out Shares will vest if, at any time through June 16, 2027, the Alvotech Holdings S.A. common share price is at or above a VWAP of $20.00 per share for any ten trading days within any twenty trading day period.
[20] Income producing through payment of dividends or distributions.
[21] This investment was renamed during the three months ended June 30, 2024. For the periods prior to June 30, 2024, this investment was referenced as SCP Eye Care Services, LLC.
[22] Income producing through payment of dividends or distributions.
[23] See Note 3 in the accompanying notes to the Consolidated Financial Statements for portfolio composition of the Company's joint ventures.
[24] This investment was valued using net asset value as a practical expedient for fair value. Consistent with ASC 820, these investments are excluded from the hierarchical levels.
[25] See Note 3 in the accompanying notes to the Consolidated Financial Statements for portfolio composition of the Company's joint ventures.
[26] This investment was valued using net asset value as a practical expedient for fair value. Consistent with ASC 820, these investments are excluded from the hierarchical levels.
[27] This investment represents a credit default swap that functions, in substance, like a credit linked note and represents a credit risk transfer for a pool of reference assets owned by a bank. The Company fully funded margin up front and in return the Company receives periodic interest payments. The Company’s risk of loss is limited to the principal amount disclosed herein. The reference assets are primarily composed of investment grade corporate debt. The Company may be exposed to counterparty risk, which could make it difficult for the Company to collect on obligations, thereby resulting in potentially significant losses. In addition, the Company only has a contractual relationship with the counterparty bank, and not with the reference obligors of the reference assets. Accordingly, the Company generally may have no right to directly enforce compliance by the reference obligors with the terms of the reference assets. The Company will not directly benefit from the reference assets and will not have the benefit of the remedies that would normally be available to a holder of such reference assets. In addition, in the event of the insolvency of the counterparty bank, the Company may be treated as a general creditor of such counterparty bank, and will not have any claim with respect to the reference assets.
[28] This investment represents a credit default swap that functions, in substance, like a credit linked note and represents a credit risk transfer for a pool of reference assets owned by a bank. The Company fully funded margin up front and in return the Company receives periodic interest payments. The Company’s risk of loss is limited to the principal amount disclosed herein. The reference assets are primarily composed of investment grade corporate debt. The Company may be exposed to counterparty risk, which could make it difficult for the Company to collect on obligations, thereby resulting in potentially significant losses. In addition, the Company only has a contractual relationship with the counterparty bank, and not with the reference obligors of the reference assets. Accordingly, the Company generally may have no right to directly enforce compliance by the reference obligors with the terms of the reference assets. The Company will not directly benefit from the reference assets and will not have the benefit of the remedies that would normally be available to a holder of such reference assets. In addition, in the event of the insolvency of the counterparty bank, the Company may be treated as a general creditor of such counterparty bank, and will not have any claim with respect to the reference assets.