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Investments - Narrative (Details)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
EUR (€)
 [4],[5],[9]
Sep. 30, 2025
GBP (£)
 [4],[5],[9],[17],[52]
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
 [7],[8],[11],[18],[53]
Sep. 30, 2023
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost $ 3,062,321 [1] $ 3,062,321 [1]     $ 3,101,924 [2]          
Investments at fair value 2,943,619 [1] 2,943,619 [1]     3,091,024 [2]          
Investment, Identifier [Axis]: AAC Lender Holdings, LLC, Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 0 [3],[4],[5] 0 [3],[4],[5]     0 [6],[7],[8]          
Investments at fair value 0 [3],[4],[5] 0 [3],[4],[5]     0 [6],[7],[8]          
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,659 [4],[5],[9],[10] 3,659 [4],[5],[9],[10]     3,659 [7],[8],[11],[12]          
Cost (37) [4],[5],[10] (37) [4],[5],[10]     (37) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 22,560 [4],[9],[13],[14] 22,560 [4],[9],[13],[14]     22,733 [7],[11],[15],[16]          
Cost 22,444 [4],[13],[14] 22,444 [4],[13],[14]     22,583 [7],[15],[16]          
Investments at fair value 22,560 [4],[13],[14] 22,560 [4],[13],[14]     22,734 [7],[15],[16]          
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 20,061 [4],[5],[9],[17] 20,061 [4],[5],[9],[17]     20,218 [7],[8],[11],[18]          
Cost 19,974 [4],[5],[17] 19,974 [4],[5],[17]     20,104 [7],[8],[18]          
Investments at fair value 20,061 [4],[5],[17] 20,061 [4],[5],[17]     20,218 [7],[8],[18]          
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 9,525 [4],[9],[19] 9,525 [4],[9],[19]     9,599 [7],[11],[20]          
Cost 9,483 [4],[19] 9,483 [4],[19]     9,545 [7],[20]          
Investments at fair value 9,525 [4],[19] 9,525 [4],[19]     9,599 [7],[20]          
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,319 [4],[9],[19] 7,319 [4],[9],[19]     7,375 [7],[11],[20]          
Cost 7,282 [4],[19] 7,282 [4],[19]     7,327 [7],[20]          
Investments at fair value 7,319 [4],[19] 7,319 [4],[19]     7,375 [7],[20]          
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 17,145 [4],[5],[9],[17] 17,145 [4],[5],[9],[17]     15,733 [7],[8],[11],[18]          
Cost 17,020 [4],[5],[17] 17,020 [4],[5],[17]     15,598 [7],[8],[18]          
Investments at fair value 16,901 [4],[5],[17] 16,901 [4],[5],[17]     15,366 [7],[8],[18]          
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 6,724 [4],[9],[19] 6,724 [4],[9],[19]     6,170 [7],[11],[20]          
Cost 6,674 [4],[19] 6,674 [4],[19]     6,117 [7],[20]          
Investments at fair value 6,628 [4],[19] 6,628 [4],[19]     6,027 [7],[20]          
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         235          
Cost [7],[8],[12]         233          
Investments at fair value [7],[8],[12]         228          
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,224 1,224                
Cost [4],[5],[10] 1,212 1,212                
Investments at fair value [4],[5],[10] 1,102 1,102                
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,130 [4],[5],[9],[10],[21] 1,130 [4],[5],[9],[10],[21]     2,118 [7],[8],[11],[12],[22]          
Cost (11) [4],[5],[10],[21] (11) [4],[5],[10],[21]     (21) [7],[8],[12],[22]          
Investments at fair value (113) [4],[5],[10],[21] (113) [4],[5],[10],[21]     (62) [7],[8],[12],[22]          
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 22,456 [4],[9],[13],[14] 22,456 [4],[9],[13],[14]     21,910 [7],[11],[15],[16]          
Cost 22,351 [4],[13],[14] 22,351 [4],[13],[14]     21,782 [7],[15],[16]          
Investments at fair value 20,210 [4],[13],[14] 20,210 [4],[13],[14]     21,266 [7],[15],[16]          
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,311 [4],[5],[9],[17] 4,311 [4],[5],[9],[17]     4,206 [7],[8],[11],[18]          
Cost 4,281 [4],[5],[17] 4,281 [4],[5],[17]     4,170 [7],[8],[18]          
Investments at fair value 3,880 [4],[5],[17] 3,880 [4],[5],[17]     4,082 [7],[8],[18]          
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,980 [4],[5],[9],[17] 3,980 [4],[5],[9],[17]     3,884 [7],[8],[11],[18]          
Cost 3,959 [4],[5],[17] 3,959 [4],[5],[17]     3,858 [7],[8],[18]          
Investments at fair value 3,582 [4],[5],[17] 3,582 [4],[5],[17]     3,769 [7],[8],[18]          
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 20,249 20,249                
Cost 20,124 [4],[5],[21] 20,124 [4],[5],[21]     18,444 [7],[8],[22]          
Investments at fair value 10,125 [4],[5],[21] 10,125 [4],[5],[21]     16,419 [7],[8],[22]          
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,062 [4],[5],[9],[17] 3,062 [4],[5],[9],[17]     3,062 [7],[8],[11],[18]          
Cost 3,050 [4],[5],[17] 3,050 [4],[5],[17]     3,048 [7],[8],[18]          
Investments at fair value 3,062 [4],[5],[17] 3,062 [4],[5],[17]     3,062 [7],[8],[18]          
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,077 [4],[5],[9],[10] 3,077 [4],[5],[9],[10]     3,077 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Accelya Lux Finco S.a.r.l., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [5],[9],[23] 9,552 9,552                
Cost [5],[23] 9,361 9,361                
Investments at fair value [5],[23] 9,361 9,361                
Investment, Identifier [Axis]: Acumatica Holdings, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 39,188 39,188                
Cost [4],[5],[17] 39,188 39,188                
Investments at fair value [4],[5],[17] 39,188 39,188                
Investment, Identifier [Axis]: Acumatica Holdings, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 9,403 9,403                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,739 [4],[5],[9],[17],[23] 4,739 [4],[5],[9],[17],[23]     4,698 [7],[8],[11],[18],[24]          
Cost 4,701 [4],[5],[17],[23] 4,701 [4],[5],[17],[23]     4,656 [7],[8],[18],[24]          
Investments at fair value 4,739 [4],[5],[17],[23] 4,739 [4],[5],[17],[23]     4,698 [7],[8],[18],[24]          
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,048          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,048 1,048                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 667 [4],[5],[9],[10] 667 [4],[5],[9],[10]     667 [7],[8],[11],[12]          
Cost (7) [4],[5],[10] (7) [4],[5],[10]     (7) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp. First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 8,414 8,414                
Cost [4],[5],[17] 8,324 8,324                
Investments at fair value [4],[5],[17] 8,309 8,309                
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         8,510          
Cost [7],[8],[18]         8,406          
Investments at fair value [7],[8],[18]         8,404          
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[16]         1,348          
Investments at fair value [7],[16]         1,348          
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8]         1,300          
Investments at fair value [7],[8]         1,300          
Investment, Identifier [Axis]: Ambrosia Topco LLC, Class A-1 common units 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[14] 1,348 1,348                
Investments at fair value [4],[14] 590 590                
Investment, Identifier [Axis]: Ambrosia Topco LLC, Class A-1 common units 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[5] 1,300 1,300                
Investments at fair value [4],[5] 569 569                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,969          
Cost [7],[8],[12]         (10)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,969 1,969                
Cost [4],[5],[10] (10) (10)                
Investments at fair value [4],[5],[10] (23) (23)                
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 18,818 [4],[5],[9],[17] 18,818 [4],[5],[9],[17]     18,964 [7],[11],[15],[16]          
Cost 18,774 [4],[5],[17] 18,774 [4],[5],[17]     18,908 [7],[15],[16]          
Investments at fair value 18,603 [4],[5],[17] 18,603 [4],[5],[17]     18,964 [7],[15],[16]          
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 5,237 [4],[9],[13],[14] 5,237 [4],[9],[13],[14]     5,277 [7],[11],[15],[16]          
Cost 5,223 [4],[13],[14] 5,223 [4],[13],[14]     5,259 [7],[15],[16]          
Investments at fair value 5,176 [4],[13],[14] 5,176 [4],[13],[14]     5,277 [7],[15],[16]          
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 688 [4],[5],[9],[17] 688 [4],[5],[9],[17]     693 [7],[8],[11],[18]          
Cost 686 [4],[5],[17] 686 [4],[5],[17]     690 [7],[8],[18]          
Investments at fair value 680 [4],[5],[17] 680 [4],[5],[17]     693 [7],[8],[18]          
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 31,406 31,406                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [6],[7],[8],[11],[12]         2,652          
Cost [6],[7],[8],[12]         0          
Investments at fair value [6],[7],[8],[12]         0          
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [3],[4],[5],[9],[10] 2,652 2,652                
Cost [3],[4],[5],[10] 0 0                
Investments at fair value [3],[4],[5],[10] 0 0                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 29,879 [4],[9],[14] 29,879 [4],[9],[14]     29,879 [7],[11],[16]          
Cost 29,842 [4],[14] 29,842 [4],[14]     29,843 [7],[16]          
Investments at fair value 17,999 [4],[14] 17,999 [4],[14]     17,999 [7],[16]          
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,527 [4],[5],[9] 1,527 [4],[5],[9]     1,527 [7],[8],[11]          
Cost 1,527 [4],[5] 1,527 [4],[5]     1,527 [7],[8]          
Investments at fair value 0 [4],[5] 0 [4],[5]     0 [7],[8]          
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien, Non-accrual status                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount             $ 17,927 $ 13,479    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Non-accrual status                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 31,369 31,369                
Investments at fair value 17,999 17,999                
Unearned interest income 1,400 4,038                
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 5,230 [4],[5],[9] 5,230 [4],[5],[9]     5,230 [7],[8],[11]          
Cost 0 [4],[5] 0 [4],[5]     0 [7],[8]          
Investments at fair value 0 [4],[5] 0 [4],[5]     0 [7],[8]          
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated, Non-accrual status                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount                 $ 5,230  
Investment, Identifier [Axis]: Anaplan, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 10,539 [4],[5],[9],[17] 10,539 [4],[5],[9],[17]     10,618 [7],[8],[11],[18]          
Cost 10,479 [4],[5],[17] 10,479 [4],[5],[17]     10,548 [7],[8],[18]          
Investments at fair value 10,539 [4],[5],[17] 10,539 [4],[5],[17]     10,618 [7],[8],[18]          
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 83 [4],[25] 83 [4],[25]     83 [7],[26]          
Investments at fair value 0 [4],[25] 0 [4],[25]     0 [7],[26]          
Investment, Identifier [Axis]: Associations, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 49,057 [4],[5],[9],[17] 49,057 [4],[5],[9],[17]     49,430 [7],[8],[11],[18]          
Cost 49,038 [4],[5],[17] 49,038 [4],[5],[17]     49,409 [7],[8],[18]          
Investments at fair value 49,057 [4],[5],[17] 49,057 [4],[5],[17]     49,430 [7],[8],[18]          
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         641          
Cost [7],[8],[12]         641          
Investments at fair value [7],[8],[12]         641          
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         3,200          
Cost [7],[8],[12]         (2)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,450 1,450                
Cost [4],[5],[10] 1,449 1,449                
Investments at fair value [4],[5],[10] 1,450 1,450                
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,539          
Cost [7],[8],[12]         1,538          
Investments at fair value [7],[8],[12]         1,539          
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,380 [4],[5],[9],[10] 2,380 [4],[5],[9],[10]     1,539 [7],[8],[11],[12]          
Cost (1) [4],[5],[10] (1) [4],[5],[10]     (1) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 3,077 3,077                
Cost [4],[5],[10] (2) (2)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Associations, Inc., Subordinated 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 8,851 [4],[5],[9] 8,851 [4],[5],[9]     7,959 [7],[8],[11]          
Cost 8,835 [4],[5] 8,835 [4],[5]     7,942 [7],[8]          
Investments at fair value 9,028 [4],[5] 9,028 [4],[5]     7,959 [7],[8]          
Investment, Identifier [Axis]: Associations, Inc., Subordinated 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,380 [4],[5],[9] 3,380 [4],[5],[9]     3,039 [7],[8],[11]          
Cost 3,374 [4],[5] 3,374 [4],[5]     3,033 [7],[8]          
Investments at fair value 3,515 [4],[5] 3,515 [4],[5]     3,039 [7],[8]          
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18],[24]         34,459          
Cost [7],[8],[18],[24]         34,335          
Investments at fair value [7],[8],[18],[24]         34,459          
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12],[24]         320          
Cost [7],[8],[12],[24]         (5)          
Investments at fair value [7],[8],[12],[24]         0          
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10],[23] 790 790                
Cost [4],[5],[10],[23] (6) (6)                
Investments at fair value [4],[5],[10],[23] 0 0                
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,474 [4],[9],[13],[14] 4,474 [4],[9],[13],[14]     3,445 [7],[8],[11],[18]          
Cost 4,464 [4],[13],[14] 4,464 [4],[13],[14]     3,405 [7],[8],[18]          
Investments at fair value 4,474 [4],[13],[14] 4,474 [4],[13],[14]     3,445 [7],[8],[18]          
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,419 [4],[5],[9],[17] 3,419 [4],[5],[9],[17]     1,342 [7],[8],[11],[18]          
Cost 3,384 [4],[5],[17] 3,384 [4],[5],[17]     1,330 [7],[8],[18]          
Investments at fair value 3,419 [4],[5],[17] 3,419 [4],[5],[17]     1,342 [7],[8],[18]          
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 1,332 1,332                
Cost [4],[5],[17] 1,322 1,322                
Investments at fair value [4],[5],[17] 1,332 1,332                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 36,155 36,155                
Cost [4],[5],[17] 35,971 35,971                
Investments at fair value [4],[5],[17] 35,522 35,522                
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         21,624          
Cost [7],[8],[18]         21,492          
Investments at fair value [7],[8],[18]         21,138          
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         14,624          
Cost [7],[15],[16]         14,534          
Investments at fair value [7],[15],[16]         14,295          
Investment, Identifier [Axis]: Avalara, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         17,198          
Cost [7],[8],[18]         17,045          
Investments at fair value [7],[8],[18]         17,198          
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,720          
Cost [7],[8],[12]         (21)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [8],[18],[24]         13,788          
Investments at fair value [8],[18],[24]         13,867          
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         13,687          
Cost [7],[8],[18]         13,591          
Investments at fair value [7],[8],[18]         13,585          
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,122 [4],[5],[9],[10] 2,122 [4],[5],[9],[10]     2,065 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value (11) [4],[5],[10] (11) [4],[5],[10]     (15) [7],[8],[12]          
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,707 [4],[5],[9],[10] 3,707 [4],[5],[9],[10]     2,894 [7],[8],[11],[12]          
Cost (26) [4],[5],[10] (26) [4],[5],[10]     (22) [7],[8],[12]          
Investments at fair value (19) [4],[5],[10] (19) [4],[5],[10]     (22) [7],[8],[12]          
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 15,642 15,642                
Cost [4],[5],[17] 15,540 15,540                
Investments at fair value [4],[5],[17] 15,642 15,642                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 5,782 5,782                
Cost [4],[13],[14] 5,755 5,755                
Investments at fair value [4],[13],[14] 5,753 5,753                
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 378 378                
Cost [4],[5],[17] 376 376                
Investments at fair value [4],[5],[17] 376 376                
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,046 [4],[5],[9],[17] 3,046 [4],[5],[9],[17]     6,109 [7],[8],[11],[18],[27]          
Cost 3,036 [4],[5],[17] 3,036 [4],[5],[17]     6,081 [7],[8],[18],[27]          
Investments at fair value 3,046 [4],[5],[17] 3,046 [4],[5],[17]     6,109 [7],[8],[18],[27]          
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 417 [4],[5],[9],[10] 417 [4],[5],[9],[10]     417 [7],[8],[11],[12],[27]          
Cost (4) [4],[5],[10] (4) [4],[5],[10]     (4) [7],[8],[12],[27]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12],[27]          
Investment, Identifier [Axis]: Bamboo Health Intermediate Holdings (fka Appriss Health Intermediate Holdings, Inc.), Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8],[27]         3,432          
Investments at fair value [7],[8],[27]         3,371          
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 464 [4],[5],[9],[10] 464 [4],[5],[9],[10]     467 [7],[8],[11],[12]          
Cost 460 [4],[5],[10] 460 [4],[5],[10]     464 [7],[8],[12]          
Investments at fair value 464 [4],[5],[10] 464 [4],[5],[10]     467 [7],[8],[12]          
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,685 [4],[5],[9],[10] 1,685 [4],[5],[9],[10]     1,685 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Bonterra LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 15,027 15,027                
Cost [4],[5],[17] 14,997 14,997                
Investments at fair value [4],[5],[17] 14,990 14,990                
Investment, Identifier [Axis]: Bonterra LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 244 244                
Cost [4],[5],[10] 244 244                
Investments at fair value [4],[5],[10] 244 244                
Investment, Identifier [Axis]: Bonterra LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,384 1,384                
Cost [4],[5],[10] (3) (3)                
Investments at fair value [4],[5],[10] (3) (3)                
Investment, Identifier [Axis]: Bonterra LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,629 1,629                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] (4) (4)                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[12],[28]         1,319          
Cost [7],[12],[28]         1,318          
Investments at fair value [7],[12],[28]         1,319          
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         516          
Cost [7],[8],[12]         520          
Investments at fair value [7],[8],[12]         516          
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,594 1,594                
Cost [4],[5],[10] (6) (6)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         376          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,594          
Cost [7],[8],[12]         (6)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[12],[28]         963          
Cost [7],[12],[28]         (7)          
Investments at fair value [7],[12],[28]         0          
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 19,868 [4],[9],[29] 19,868 [4],[9],[29]     20,019 [7],[11],[28]          
Cost 19,789 [4],[29] 19,789 [4],[29]     19,931 [7],[28]          
Investments at fair value 19,868 [4],[29] 19,868 [4],[29]     20,019 [7],[28]          
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,768 [4],[9],[13],[14] 7,768 [4],[9],[13],[14]     7,827 [7],[11],[15],[16]          
Cost 7,768 [4],[13],[14] 7,768 [4],[13],[14]     7,827 [7],[15],[16]          
Investments at fair value 7,768 [4],[13],[14] 7,768 [4],[13],[14]     7,827 [7],[15],[16]          
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[29] 1,309 1,309                
Cost [4],[29] 1,301 1,301                
Investments at fair value [4],[29] 1,309 1,309                
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9] 512 512                
Cost [4],[5] 516 516                
Investments at fair value [4],[5] 512 512                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         935          
Cost [7],[8],[12]         (4)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 125 [4],[5],[9],[10] 125 [4],[5],[9],[10]     417 [7],[8],[11],[12]          
Cost 127 [4],[5],[10] 127 [4],[5],[10]     417 [7],[8],[12]          
Investments at fair value 125 [4],[5],[10] 125 [4],[5],[10]     417 [7],[8],[12]          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 822 [4],[5],[9],[10] 822 [4],[5],[9],[10]     1,847 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 811 811                
Cost [4],[5],[10] (6) (6)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 13,206 [4],[9],[13],[14] 13,206 [4],[9],[13],[14]     13,206 [7],[11],[15],[16]          
Cost 13,175 [4],[13],[14] 13,175 [4],[13],[14]     13,170 [7],[15],[16]          
Investments at fair value 13,206 [4],[13],[14] 13,206 [4],[13],[14]     13,206 [7],[15],[16]          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 8,879 [4],[5],[9],[17] 8,879 [4],[5],[9],[17]     8,462 [7],[8],[11],[18]          
Cost 8,943 [4],[5],[17] 8,943 [4],[5],[17]     8,452 [7],[8],[18]          
Investments at fair value 8,879 [4],[5],[17] 8,879 [4],[5],[17]     8,462 [7],[8],[18]          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,398 [4],[9],[13],[14] 3,398 [4],[9],[13],[14]     3,398 [7],[11],[15],[16]          
Cost 3,394 [4],[13],[14] 3,394 [4],[13],[14]     3,394 [7],[15],[16]          
Investments at fair value 3,398 [4],[13],[14] 3,398 [4],[13],[14]     3,398 [7],[15],[16]          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,025 [4],[5],[9],[17] 1,025 [4],[5],[9],[17]     761 [7],[11],[15],[16]          
Cost 1,022 [4],[5],[17] 1,022 [4],[5],[17]     758 [7],[15],[16]          
Investments at fair value 1,025 [4],[5],[17] 1,025 [4],[5],[17]     761 [7],[15],[16]          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 761 [4],[9],[13],[14] 761 [4],[9],[13],[14]     341 [7],[11],[15],[16]          
Cost 759 [4],[13],[14] 759 [4],[13],[14]     340 [7],[15],[16]          
Investments at fair value 761 [4],[13],[14] 761 [4],[13],[14]     341 [7],[15],[16]          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 6                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 341 [4],[9],[13],[14] 341 [4],[9],[13],[14]     272 [7],[11],[15],[16]          
Cost 340 [4],[13],[14] 340 [4],[13],[14]     271 [7],[15],[16]          
Investments at fair value 341 [4],[13],[14] 341 [4],[13],[14]     272 [7],[15],[16]          
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 7                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 272 272                
Cost [4],[13],[14] 271 271                
Investments at fair value [4],[13],[14] 272 272                
Investment, Identifier [Axis]: CB Buyer, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         3,308          
Cost [7],[15],[16]         3,293          
Investments at fair value [7],[15],[16]         3,292          
Investment, Identifier [Axis]: CB Buyer, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         364          
Cost [7],[8],[12]         (2)          
Investments at fair value [7],[8],[12]         (2)          
Investment, Identifier [Axis]: CB Buyer, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         934          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         (5)          
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 11,997 [4],[5],[9],[17] 11,997 [4],[5],[9],[17]     11,881 [7],[11],[15],[16]          
Cost 11,997 [4],[5],[17] 11,997 [4],[5],[17]     11,880 [7],[15],[16]          
Investments at fair value 10,497 [4],[5],[17] 10,497 [4],[5],[17]     10,693 [7],[15],[16]          
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,574 [4],[9],[13],[14] 3,574 [4],[9],[13],[14]     3,539 [7],[11],[15],[16]          
Cost 3,583 [4],[13],[14] 3,583 [4],[13],[14]     3,548 [7],[15],[16]          
Investments at fair value 3,127 [4],[13],[14] 3,127 [4],[13],[14]     3,185 [7],[15],[16]          
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 8,559 [4],[9],[13],[14] 8,559 [4],[9],[13],[14]     8,493 [7],[11],[15],[16]          
Cost 8,526 [4],[13],[14] 8,526 [4],[13],[14]     8,447 [7],[15],[16]          
Investments at fair value 8,559 [4],[13],[14] 8,559 [4],[13],[14]     8,449 [7],[15],[16]          
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,084 [4],[5],[9],[10],[17] 1,084 [4],[5],[9],[10],[17]     954 [7],[8],[11],[12],[18]          
Cost 1,072 [4],[5],[10],[17] 1,072 [4],[5],[10],[17]     945 [7],[8],[12],[18]          
Investments at fair value 1,084 [4],[5],[10],[17] 1,084 [4],[5],[10],[17]     950 [7],[8],[12],[18]          
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 113 [4],[5],[9],[10] 113 [4],[5],[9],[10]     226 [7],[8],[11],[12]          
Cost (1) [4],[5],[10] (1) [4],[5],[10]     (3) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (1) [7],[8],[12]          
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 6,467 [4],[9],[13],[14] 6,467 [4],[9],[13],[14]     6,516 [7],[11],[15],[16]          
Cost 6,438 [4],[13],[14] 6,438 [4],[13],[14]     6,484 [7],[15],[16]          
Investments at fair value 6,467 [4],[13],[14] 6,467 [4],[13],[14]     6,483 [7],[15],[16]          
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12],[18]         489          
Cost [7],[8],[12],[18]         486          
Investments at fair value [7],[8],[12],[18]         486          
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,629 [4],[5],[9],[10] 1,629 [4],[5],[9],[10]     597 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     (3) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (3) [7],[8],[12]          
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,086 [4],[5],[9],[10] 1,086 [4],[5],[9],[10]     1,629 [7],[8],[11],[12]          
Cost (5) [4],[5],[10] (5) [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (8) [7],[8],[12]          
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         850          
Cost [7],[8],[12]         (6)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 637 [5],[9],[10] 637 [5],[9],[10]     637 [7],[8],[11],[12]          
Cost 633 [5],[10] 633 [5],[10]     633 [7],[8],[12]          
Investments at fair value 637 [5],[10] 637 [5],[10]     637 [7],[8],[12]          
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [5],[9],[10] 850 850                
Cost [5],[10] (6) (6)                
Investments at fair value [5],[10] 0 0                
Investment, Identifier [Axis]: Calabrio, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 12,193 [9],[29] 12,193 [9],[29]     12,286 [7],[11],[28]          
Cost 12,164 [29] 12,164 [29]     12,244 [7],[28]          
Investments at fair value 12,193 [29] 12,193 [29]     12,286 [7],[28]          
Investment, Identifier [Axis]: Calabrio, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,562 [9],[29] 1,562 [9],[29]     1,574 [7],[11],[28]          
Cost 1,554 [29] 1,554 [29]     1,562 [7],[28]          
Investments at fair value 1,562 [29] 1,562 [29]     1,574 [7],[28]          
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 11,639 [9],[19] 11,639 [9],[19]     11,730 [11],[20]          
Cost 11,607 [19] 11,607 [19]     11,689 [20]          
Investments at fair value 11,582 [19] 11,582 [19]     11,249 [20]          
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 9,767 [4],[9],[19] 9,767 [4],[9],[19]     9,767 [7],[11],[20]          
Cost 9,718 [4],[19] 9,718 [4],[19]     9,709 [7],[20]          
Investments at fair value 9,757 [4],[19] 9,757 [4],[19]     9,423 [7],[20]          
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 36,475 [4],[9],[13],[14] 36,475 [4],[9],[13],[14]     35,797 [7],[11],[15],[16]          
Cost 36,124 [4],[13],[14] 36,124 [4],[13],[14]     35,399 [7],[15],[16]          
Investments at fair value 36,475 [4],[13],[14] 36,475 [4],[13],[14]     35,797 [7],[15],[16]          
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,980 [4],[5],[9],[10] 3,980 [4],[5],[9],[10]     3,980 [7],[8],[11],[12]          
Cost (50) [4],[5],[10] (50) [4],[5],[10]     (50) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Ciklum Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16],[24]         9,536          
Cost [7],[15],[16],[24]         9,430          
Investments at fair value [7],[15],[16],[24]         9,536          
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10],[23] 2,989 2,989                
Cost [4],[5],[10],[23] (37) (37)                
Investments at fair value [4],[5],[10],[23] 0 0                
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         11,955          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         2,989          
Cost [7],[8],[12]         (37)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Ciklum Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 9,464 9,464                
Cost [4],[13],[14] 9,371 9,371                
Investments at fair value [4],[13],[14] 9,464 9,464                
Investment, Identifier [Axis]: Ciklum Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 5,353 5,353                
Cost [4],[5],[17] 5,290 5,290                
Investments at fair value [4],[5],[17] 5,353 5,353                
Investment, Identifier [Axis]: Cleanova US Holdings, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14],[23] 8,406 8,406                
Cost [4],[13],[14],[23] 8,120 8,120                
Investments at fair value [4],[13],[14],[23] 8,406 8,406                
Investment, Identifier [Axis]: CommerceHub, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         3,920          
Cost [7],[8],[18]         3,608          
Investments at fair value [7],[8],[18]         3,920          
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 58 58                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 611 611                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] (5) (5)                
Investment, Identifier [Axis]: Community Management Holdings MidCo 2, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10],[17] 1,237 1,237                
Cost [4],[5],[10],[17] 1,225 1,225                
Investments at fair value [4],[5],[10],[17] 1,227 1,227                
Investment, Identifier [Axis]: Compsych Investments Corp., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,810 [4],[9],[13],[14] 7,810 [4],[9],[13],[14]     1,164 [7],[11],[15],[16]          
Cost 7,758 [4],[13],[14] 7,758 [4],[13],[14]     1,162 [7],[15],[16]          
Investments at fair value 7,810 [4],[13],[14] 7,810 [4],[13],[14]     1,162 [7],[15],[16]          
Investment, Identifier [Axis]: Compsych Investments Corp., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,253 [4],[5],[9],[10] 2,253 [4],[5],[9],[10]     333 [7],[8],[11],[12]          
Cost (14) [4],[5],[10] (14) [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (1) [7],[8],[12]          
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 13,431 [4],[5],[9],[17] 13,431 [4],[5],[9],[17]     13,152 [7],[8],[11],[18]          
Cost 13,388 [4],[5],[17] 13,388 [4],[5],[17]     13,101 [7],[8],[18]          
Investments at fair value 11,266 [4],[5],[17] 11,266 [4],[5],[17]     11,935 [7],[8],[18]          
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,243 [4],[5],[9],[17] 2,243 [4],[5],[9],[17]     2,196 [7],[8],[11],[18]          
Cost 2,229 [4],[5],[17] 2,229 [4],[5],[17]     2,180 [7],[8],[18]          
Investments at fair value 1,881 [4],[5],[17] 1,881 [4],[5],[17]     1,993 [7],[8],[18]          
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,042 [4],[5],[9],[17] 1,042 [4],[5],[9],[17]     1,050 [7],[8],[11],[18]          
Cost 1,037 [4],[5],[17] 1,037 [4],[5],[17]     1,045 [7],[8],[18]          
Investments at fair value 1,042 [4],[5],[17] 1,042 [4],[5],[17]     1,050 [7],[8],[18]          
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         578          
Cost [7],[8],[12]         (3)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 578 578                
Cost [4],[5],[10] (3) (3)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 14,280 [4],[5],[9],[17] 14,280 [4],[5],[9],[17]     14,388 [7],[8],[11],[18]          
Cost 14,152 [4],[5],[17] 14,152 [4],[5],[17]     14,243 [7],[8],[18]          
Investments at fair value 14,280 [4],[5],[17] 14,280 [4],[5],[17]     14,388 [7],[8],[18]          
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,291 [4],[5],[9],[10] 1,291 [4],[5],[9],[10]     1,291 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 989 [4],[5],[9],[10] 989 [4],[5],[9],[10]     989 [7],[8],[11],[12]          
Cost (12) [4],[5],[10] (12) [4],[5],[10]     (12) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.), First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 19,259 19,259                
Cost [4],[5],[17] 19,138 19,138                
Investments at fair value [4],[5],[17] 19,259 19,259                
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.), First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 5,012 5,012                
Cost [4],[5],[17] 4,999 4,999                
Investments at fair value [4],[5],[17] 5,012 5,012                
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.), First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 4,913 4,913                
Cost [4],[13],[14] 4,882 4,882                
Investments at fair value [4],[13],[14] 4,913 4,913                
Investment, Identifier [Axis]: Cronos Crimson Holdings, Inc. (f/k/a NMC Crimson Holdings, Inc.), First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 4,706 4,706                
Cost [4],[5],[17] 4,686 4,686                
Investments at fair value [4],[5],[17] 4,706 4,706                
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,839 [4],[9],[13],[14] 1,839 [4],[9],[13],[14]     1,804 [7],[11],[15],[16]          
Cost 1,835 [4],[13],[14] 1,835 [4],[13],[14]     1,798 [7],[15],[16]          
Investments at fair value 1,621 [4],[13],[14] 1,621 [4],[13],[14]     1,758 [7],[15],[16]          
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,031 [4],[5],[9],[17] 1,031 [4],[5],[9],[17]     1,011 [7],[8],[11],[18]          
Cost 1,022 [4],[5],[17] 1,022 [4],[5],[17]     1,000 [7],[8],[18]          
Investments at fair value 912 [4],[5],[17] 912 [4],[5],[17]     987 [7],[8],[18]          
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 9,512 [4],[5],[9],[17] 9,512 [4],[5],[9],[17]     20,313 [8],[11],[18]          
Cost 9,465 [4],[5],[17] 9,465 [4],[5],[17]     20,280 [8],[18]          
Investments at fair value 9,464 [4],[5],[17] 9,464 [4],[5],[17]     20,281 [8],[18]          
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,405 [4],[5],[9],[10] 2,405 [4],[5],[9],[10]     2,405 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (13) [7],[8],[12]          
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 18,196 [4],[5],[9],[17] 18,196 [4],[5],[9],[17]     18,337 [7],[8],[11],[18]          
Cost 18,196 [4],[5],[17] 18,196 [4],[5],[17]     18,337 [7],[8],[18]          
Investments at fair value 18,196 [4],[5],[17] 18,196 [4],[5],[17]     18,236 [7],[8],[18]          
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 6,814 [4],[9],[19] 6,814 [4],[9],[19]     6,867 [7],[11],[20]          
Cost 6,814 [4],[19] 6,814 [4],[19]     6,867 [7],[20]          
Investments at fair value 6,814 [4],[19] 6,814 [4],[19]     6,829 [7],[20]          
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 3,363 3,363                
Cost [4],[5],[17] 3,342 3,342                
Investments at fair value [4],[5],[17] 3,363 3,363                
Investment, Identifier [Axis]: DOXA Insurance Holdings LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,046 [4],[5],[9],[10] 3,046 [4],[5],[9],[10]     3,046 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: DT1 Midco Corp, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 1,345 1,345                
Cost [4],[13],[14] 1,338 1,338                
Investments at fair value [4],[13],[14] 1,338 1,338                
Investment, Identifier [Axis]: DT1 Midco Corp, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 32 32                
Cost [4],[5],[10] 32 32                
Investments at fair value [4],[5],[10] 32 32                
Investment, Identifier [Axis]: DT1 Midco Corp, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 674 674                
Cost [4],[5],[10] (3) (3)                
Investments at fair value [4],[5],[10] (3) (3)                
Investment, Identifier [Axis]: DT1 Midco Corp, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 4,462 4,462                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] (22) (22)                
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 986 [4],[5],[9],[10] 986 [4],[5],[9],[10]     986 [7],[8],[11],[12]          
Cost (10) [4],[5],[10] (10) [4],[5],[10]     (10) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 12,779 [4],[5],[9],[17] 12,779 [4],[5],[9],[17]     12,878 [7],[8],[11],[18]          
Cost 12,714 [4],[5],[17] 12,714 [4],[5],[17]     12,799 [7],[8],[18]          
Investments at fair value 12,779 [4],[5],[17] 12,779 [4],[5],[17]     12,878 [7],[8],[18]          
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,077 [4],[9],[13],[14] 1,077 [4],[9],[13],[14]     1,085 [7],[11],[15],[16]          
Cost 1,071 [4],[13],[14] 1,071 [4],[13],[14]     1,078 [7],[15],[16]          
Investments at fair value 1,077 [4],[13],[14] 1,077 [4],[13],[14]     1,085 [7],[15],[16]          
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 64 [4],[5],[9] 64 [4],[5],[9]     65 [7],[8],[11]          
Cost 64 [4],[5] 64 [4],[5]     64 [7],[8]          
Investments at fair value 64 [4],[5] 64 [4],[5]     65 [7],[8]          
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred Shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 84,739 84,739                
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 75,927 [4],[5],[17],[30] 75,927 [4],[5],[17],[30]     75,927 [7],[8],[18]          
Investments at fair value 81,078 [4],[5],[17],[30] 81,078 [4],[5],[17],[30]     79,222 [7],[8],[18]          
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12],[18]         3,027          
Cost [7],[8],[12],[18]         2,997          
Investments at fair value [7],[8],[12],[18]         2,987          
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10],[17] 3,027 3,027                
Cost [4],[5],[10],[17] 2,997 2,997                
Investments at fair value [4],[5],[10],[17] 2,947 2,947                
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 36,806 [4],[9],[13],[14] 36,806 [4],[9],[13],[14]     37,094 [7],[11],[15],[16]          
Cost 36,624 [4],[13],[14] 36,624 [4],[13],[14]     36,871 [7],[15],[16]          
Investments at fair value 35,834 [4],[13],[14] 35,834 [4],[13],[14]     36,604 [7],[15],[16]          
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,874 [4],[5],[9],[17] 3,874 [4],[5],[9],[17]     3,905 [7],[8],[11],[18]          
Cost 3,854 [4],[5],[17] 3,854 [4],[5],[17]     3,880 [7],[8],[18]          
Investments at fair value 3,772 [4],[5],[17] 3,772 [4],[5],[17]     3,853 [7],[8],[18]          
Investment, Identifier [Axis]: Denali Intermediate Holdings, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 9,091 9,091                
Cost [4],[13],[14] 9,046 9,046                
Investments at fair value [4],[13],[14] 9,045 9,045                
Investment, Identifier [Axis]: Denali Intermediate Holdings, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 909 909                
Cost [4],[5],[10] (5) (5)                
Investments at fair value [4],[5],[10] (5) (5)                
Investment, Identifier [Axis]: Digicert, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,119 1,119                
Cost [4],[5],[10] (8) (8)                
Investments at fair value [4],[5],[10] (8) (8)                
Investment, Identifier [Axis]: Digicert, Inc.., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 15,500 15,500                
Cost [4],[13],[14] 15,387 15,387                
Investments at fair value [4],[13],[14] 15,384 15,384                
Investment, Identifier [Axis]: Diligent Corporation, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 249 249                
Cost [4],[5],[10] 248 248                
Investments at fair value [4],[5],[10] 249 249                
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,016 [4],[5],[9],[10] 2,016 [4],[5],[9],[10]     2,265 [7],[8],[11],[12]          
Cost (8) [4],[5],[10] (8) [4],[5],[10]     (8) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,398 [4],[5],[9],[10] 3,398 [4],[5],[9],[10]     3,398 [7],[8],[11],[12]          
Cost (13) [4],[5],[10] (13) [4],[5],[10]     (13) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 19,821 [4],[9],[13],[14] 19,821 [4],[9],[13],[14]     19,821 [7],[11],[15],[16]          
Cost 19,760 [4],[13],[14] 19,760 [4],[13],[14]     19,753 [7],[15],[16]          
Investments at fair value 19,821 [4],[13],[14] 19,821 [4],[13],[14]     19,821 [7],[15],[16]          
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,398 [4],[5],[9],[17] 3,398 [4],[5],[9],[17]     3,398 [7],[8],[11],[18]          
Cost 3,387 [4],[5],[17] 3,387 [4],[5],[17]     3,386 [7],[8],[18]          
Investments at fair value 3,398 [4],[5],[17] 3,398 [4],[5],[17]     3,398 [7],[8],[18]          
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 15,827 15,827                
Cost 15,702 [4],[5],[31] 15,702 [4],[5],[31]     14,162 [7],[8],[32]          
Investments at fair value 15,036 [4],[5],[31] 15,036 [4],[5],[31]     13,609 [7],[8],[32]          
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 10,628 [4],[9],[13],[14],[33] 10,628 [4],[9],[13],[14],[33]     10,628 [7],[11],[15],[16],[34]          
Cost 10,628 [4],[13],[14],[33] 10,628 [4],[13],[14],[33]     10,628 [7],[15],[16],[34]          
Investments at fair value 10,628 [4],[13],[14],[33] 10,628 [4],[13],[14],[33]     10,628 [7],[15],[16],[34]          
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 340 [4],[5],[9],[33] 340 [4],[5],[9],[33]     340 [7],[8],[11],[34]          
Cost 340 [4],[5],[33] 340 [4],[5],[33]     340 [7],[8],[34]          
Investments at fair value 340 [4],[5],[33] 340 [4],[5],[33]     340 [7],[8],[34]          
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC, Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 4,104 [4],[5],[33] 4,104 [4],[5],[33]     4,104 [7],[8],[34]          
Investments at fair value 7,368 [4],[5],[33] 7,368 [4],[5],[33]     8,188 [7],[8],[34]          
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,113 [4],[9],[19],[35] 7,113 [4],[9],[19],[35]     7,113 [7],[11],[20],[36]          
Cost 7,081 [4],[19],[35] 7,081 [4],[19],[35]     7,078 [7],[20],[36]          
Investments at fair value 7,113 [4],[19],[35] 7,113 [4],[19],[35]     7,078 [7],[20],[36]          
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,206 [4],[9],[10],[19] 1,206 [4],[9],[10],[19]     1,206 [7],[11],[12],[20]          
Cost 0 [4],[10],[19] 0 [4],[10],[19]     0 [7],[12],[20]          
Investments at fair value 0 [4],[10],[19] 0 [4],[10],[19]     (6) [7],[12],[20]          
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,190 [4],[5],[9],[10] 4,190 [4],[5],[9],[10]     4,190 [7],[8],[11],[12]          
Cost (21) [4],[5],[10] (21) [4],[5],[10]     (21) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (21) [7],[8],[12]          
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 145 [4],[5] 145 [4],[5]     145 [7],[8]          
Investments at fair value 305 [4],[5] 305 [4],[5]     305 [7],[8]          
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Preferred shares 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8]         2,900          
Investments at fair value [7],[8]         2,900          
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Preferred shares 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8]         2,565          
Investments at fair value [7],[8]         2,702          
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Series A preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,335 3,335                
Cost [4],[5] 3,335 3,335                
Investments at fair value [4],[5] 3,335 3,335                
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Series B preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,116 4,116                
Cost [4],[5] 2,565 2,565                
Investments at fair value [4],[5] 2,703 2,703                
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc., Junior preferred shares, Non-accrual status                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 2,565 2,565                
Investments at fair value 2,703 2,703                
Unearned income 119 336                
Investment, Identifier [Axis]: Eclipse Topco, Inc., Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,094 2,094                
Cost 2,075 [4],[19],[35] 2,075 [4],[19],[35]     1,952 [7],[20],[36]          
Investments at fair value 2,094 [4],[19],[35] 2,094 [4],[19],[35]     1,952 [7],[20],[36]          
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 25,465 [4],[5],[9],[33],[37] 25,465 [4],[5],[9],[33],[37]     22,290 [7],[8],[11],[34]          
Cost 25,410 [4],[5],[33],[37] 25,410 [4],[5],[33],[37]     22,223 [7],[8],[34]          
Investments at fair value 25,465 [4],[5],[33],[37] 25,465 [4],[5],[33],[37]     22,290 [7],[8],[34]          
Investment, Identifier [Axis]: Einstein Parent, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 55,582 55,582                
Cost [4],[5],[17] 55,074 55,074                
Investments at fair value [4],[5],[17] 55,026 55,026                
Investment, Identifier [Axis]: Einstein Parent, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 5,750 5,750                
Cost [4],[5],[10] (57) (57)                
Investments at fair value [4],[5],[10] (57) (57)                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12],[38]         1,400          
Cost [7],[8],[12],[38]         (14)          
Investments at fair value [7],[8],[12],[38]         0          
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 909 909                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[10],[29] 2,723 2,723                
Cost [4],[10],[29] 0 0                
Investments at fair value [4],[10],[29] 0 0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,400 1,400                
Cost [4],[5],[10] (14) (14)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 8,475 [4],[9],[29] 8,475 [4],[9],[29]     10,185 [7],[11],[28]          
Cost 8,434 [4],[29] 8,434 [4],[29]     10,127 [7],[28]          
Investments at fair value 8,475 [4],[29] 8,475 [4],[29]     10,185 [7],[28]          
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,725 [4],[5],[9],[17] 4,725 [4],[5],[9],[17]     5,677 [7],[8],[11],[18]          
Cost 4,695 [4],[5],[17] 4,695 [4],[5],[17]     5,636 [7],[8],[18]          
Investments at fair value 4,725 [4],[5],[17] 4,725 [4],[5],[17]     5,677 [7],[8],[18]          
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,845 [4],[9],[29] 2,845 [4],[9],[29]     3,419 [7],[11],[28]          
Cost 2,830 [4],[29] 2,830 [4],[29]     3,398 [7],[28]          
Investments at fair value 2,845 [4],[29] 2,845 [4],[29]     3,419 [7],[28]          
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,827 [4],[9],[29] 2,827 [4],[9],[29]     3,397 [7],[11],[28]          
Cost 2,813 [4],[29] 2,813 [4],[29]     3,378 [7],[28]          
Investments at fair value 2,827 [4],[29] 2,827 [4],[29]     3,397 [7],[28]          
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC, Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 5,000 [4],[29],[39] 5,000 [4],[29],[39]     5,000 [7],[28],[38]          
Investments at fair value 5,000 [4],[29],[39] 5,000 [4],[29],[39]     4,618 [7],[28],[38]          
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 8,150 8,150                
Cost [4],[5],[17] 8,131 8,131                
Investments at fair value [4],[5],[17] 8,130 8,130                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 733 733                
Cost [4],[5],[10] 731 731                
Investments at fair value [4],[5],[10] 731 731                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,422 1,422                
Cost [4],[5],[10] (4) (4)                
Investments at fair value [4],[5],[10] (4) (4)                
Investment, Identifier [Axis]: Firebird Acquisition Corp, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 4,005 4,005                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] (10) (10)                
Investment, Identifier [Axis]: Firebird Co-Invest L.P., LP Interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[5],[40] 3,358 3,358                
Investments at fair value [4],[5],[40] 3,358 3,358                
Investment, Identifier [Axis]: Flash Charm Inc. (fka Idera, Inc.), Second lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[19] 10,719 10,719                
Cost [4],[19] 10,640 10,640                
Investments at fair value [4],[19] 9,248 9,248                
Investment, Identifier [Axis]: Flash Charm Inc. (fka Idera, Inc.), Second lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 1,429 1,429                
Cost [4],[5],[17] 1,425 1,425                
Investments at fair value [4],[5],[17] 1,233 1,233                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 386 386                
Cost [4],[5],[10] 383 383                
Investments at fair value [4],[5],[10] 386 386                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 277 277                
Cost [4],[5],[10] 277 277                
Investments at fair value [4],[5],[10] 277 277                
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,924 [4],[5],[9],[10] 2,924 [4],[5],[9],[10]     3,312 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,034 [4],[5],[9],[10] 2,034 [4],[5],[9],[10]     2,095 [7],[8],[11],[12]          
Cost (20) [4],[5],[10] (20) [4],[5],[10]     (21) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 36,905 [4],[9],[13],[14] 36,905 [4],[9],[13],[14]     33,356 [7],[11],[15],[16]          
Cost 36,761 [4],[13],[14] 36,761 [4],[13],[14]     33,163 [7],[15],[16]          
Investments at fair value 36,905 [4],[13],[14] 36,905 [4],[13],[14]     33,356 [7],[15],[16]          
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,043 [4],[5],[9],[17] 4,043 [4],[5],[9],[17]     4,075 [7],[8],[11],[18]          
Cost 4,019 [4],[5],[17] 4,019 [4],[5],[17]     4,041 [7],[8],[18]          
Investments at fair value 4,043 [4],[5],[17] 4,043 [4],[5],[17]     4,075 [7],[8],[18]          
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10],[17] 715 715                
Cost [4],[5],[10],[17] 708 708                
Investments at fair value [4],[5],[10],[17] 715 715                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,001          
Cost [7],[8],[12]         990          
Investments at fair value [7],[8],[12]         1,001          
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         342          
Cost [7],[8],[12]         343          
Investments at fair value [7],[8],[12]         342          
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 2,145 2,145                
Cost [4],[5],[10] (21) (21)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         3,360          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,859          
Cost [7],[8],[12]         (19)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 17,043 [4],[9],[13],[14] 17,043 [4],[9],[13],[14]     17,176 [7],[11],[15],[16]          
Cost 16,953 [4],[13],[14] 16,953 [4],[13],[14]     17,066 [7],[15],[16]          
Investments at fair value 17,043 [4],[13],[14] 17,043 [4],[13],[14]     17,176 [7],[15],[16]          
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 12,267 [4],[5],[9],[17] 12,267 [4],[5],[9],[17]     12,020 [7],[8],[11],[18]          
Cost 12,206 [4],[5],[17] 12,206 [4],[5],[17]     11,946 [7],[8],[18]          
Investments at fair value 12,267 [4],[5],[17] 12,267 [4],[5],[17]     12,020 [7],[8],[18]          
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 974 [4],[5],[9],[17] 974 [4],[5],[9],[17]     80 [7],[8],[11]          
Cost 976 [4],[5],[17] 976 [4],[5],[17]     79 [7],[8]          
Investments at fair value 974 [4],[5],[17] 974 [4],[5],[17]     80 [7],[8]          
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9] 79 79                
Cost [4],[5] 79 79                
Investments at fair value [4],[5] 79 79                
Investment, Identifier [Axis]: Foundational Education Group, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [9],[13],[14] 6,367 6,367                
Cost [13],[14] 5,847 5,847                
Investments at fair value [13],[14] 5,683 5,683                
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 22,500 [4],[9],[29] 22,500 [4],[9],[29]     22,500 [7],[11],[28]          
Cost 22,433 [4],[29] 22,433 [4],[29]     22,423 [7],[28]          
Investments at fair value 22,500 [4],[29] 22,500 [4],[29]     22,500 [7],[28]          
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 10,965 [4],[5],[9],[17] 10,965 [4],[5],[9],[17]     7,009 [7],[11],[15],[16]          
Cost 10,742 [4],[5],[17] 10,742 [4],[5],[17]     6,992 [7],[15],[16]          
Investments at fair value 10,965 [4],[5],[17] 10,965 [4],[5],[17]     7,009 [7],[15],[16]          
Investment, Identifier [Axis]: Fullsteam Operations LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 6,223 6,223                
Cost [4],[13],[14] 6,192 6,192                
Investments at fair value [4],[13],[14] 6,192 6,192                
Investment, Identifier [Axis]: Fullsteam Operations LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 2,074 2,074                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Fullsteam Operations LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 691 691                
Cost [4],[5],[10] (3) (3)                
Investments at fair value [4],[5],[10] (3) (3)                
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,951 [4],[5],[9],[10] 3,951 [4],[5],[9],[10]     3,951 [7],[8],[11],[12]          
Cost (30) [4],[5],[10] (30) [4],[5],[10]     (30) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 40,009 [4],[9],[13],[14] 40,009 [4],[9],[13],[14]     40,312 [7],[11],[15],[16]          
Cost 39,806 [4],[13],[14] 39,806 [4],[13],[14]     40,084 [7],[15],[16]          
Investments at fair value 40,009 [4],[13],[14] 40,009 [4],[13],[14]     40,312 [7],[15],[16]          
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 21,287 [4],[9],[29] 21,287 [4],[9],[29]     21,448 [7],[11],[28]          
Cost 21,232 [4],[29] 21,232 [4],[29]     21,386 [7],[28]          
Investments at fair value 21,287 [4],[29] 21,287 [4],[29]     21,448 [7],[28]          
Investment, Identifier [Axis]: GEDC Equity, LLC, Participation Interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 190 [4],[5] 190 [4],[5]     190 [7],[8]          
Investments at fair value 50 [4],[5] 50 [4],[5]     50 [7],[8]          
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         319          
Cost [7],[8],[12]         319          
Investments at fair value [7],[8],[12]         319          
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,607 1,607                
Cost [4],[5],[10] 1,601 1,601                
Investments at fair value [4],[5],[10] 1,607 1,607                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 450 450                
Cost [4],[5],[10] 448 448                
Investments at fair value [4],[5],[10] 450 450                
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 759 [4],[5],[9],[10] 759 [4],[5],[9],[10]     1,120 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,214 [4],[5],[9],[10] 3,214 [4],[5],[9],[10]     4,821 [7],[8],[11],[12]          
Cost (20) [4],[5],[10] (20) [4],[5],[10]     (26) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 25,145 [4],[9],[13],[14] 25,145 [4],[9],[13],[14]     34,719 [7],[11],[15],[16]          
Cost 25,113 [4],[13],[14] 25,113 [4],[13],[14]     34,663 [7],[15],[16]          
Investments at fair value 25,145 [4],[13],[14] 25,145 [4],[13],[14]     34,719 [7],[15],[16]          
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 21,130 [4],[9],[29] 21,130 [4],[9],[29]     21,297 [7],[11],[28]          
Cost 21,102 [4],[29] 21,102 [4],[29]     21,263 [7],[28]          
Investments at fair value 21,130 [4],[29] 21,130 [4],[29]     21,297 [7],[28]          
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,886 [4],[5],[9],[17] 2,886 [4],[5],[9],[17]     2,909 [7],[8],[11],[18]          
Cost 2,881 [4],[5],[17] 2,881 [4],[5],[17]     2,902 [7],[8],[18]          
Investments at fair value 2,886 [4],[5],[17] 2,886 [4],[5],[17]     2,909 [7],[8],[18]          
Investment, Identifier [Axis]: Galway Borrower LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,081 [4],[9],[13],[14] 1,081 [4],[9],[13],[14]     1,090 [7],[11],[15],[16]          
Cost 1,076 [4],[13],[14] 1,076 [4],[13],[14]     1,083 [7],[15],[16]          
Investments at fair value 1,081 [4],[13],[14] 1,081 [4],[13],[14]     1,080 [7],[15],[16]          
Investment, Identifier [Axis]: Galway Borrower LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,792 [4],[5],[9],[10],[17] 1,792 [4],[5],[9],[10],[17]     1,806 [7],[8],[11],[12]          
Cost 1,768 [4],[5],[10],[17] 1,768 [4],[5],[10],[17]     1,779 [7],[8],[12]          
Investments at fair value 1,792 [4],[5],[10],[17] 1,792 [4],[5],[10],[17]     1,788 [7],[8],[12]          
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         17,901          
Cost [7],[15],[16]         17,858          
Investments at fair value [7],[15],[16]         17,856          
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         448          
Cost [7],[8],[12]         445          
Investments at fair value [7],[8],[12]         446          
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,682          
Cost [7],[8],[12]         (4)          
Investments at fair value [7],[8],[12]         (4)          
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         4,038          
Cost [7],[8],[12]         (10)          
Investments at fair value [7],[8],[12]         (10)          
Investment, Identifier [Axis]: Greenway Health, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 6,254 [4],[5],[9],[17] 6,254 [4],[5],[9],[17]     6,302 [7],[8],[11],[18]          
Cost 6,186 [4],[5],[17] 6,186 [4],[5],[17]     6,221 [7],[8],[18]          
Investments at fair value 6,254 [4],[5],[17] 6,254 [4],[5],[17]     6,302 [7],[8],[18]          
Investment, Identifier [Axis]: Groundworks, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [11],[20]         18,908          
Cost [20]         18,734          
Investments at fair value [20]         19,034          
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [11],[12],[20]         557          
Cost [12],[20]         552          
Investments at fair value [12],[20]         560          
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [11],[12],[20]         2,938          
Cost [12],[20]         (15)          
Investments at fair value [12],[20]         20          
Investment, Identifier [Axis]: HBWM Holdings, LLC, Common units                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[41],[42] 4,767 4,767                
Investments at fair value [4],[41],[42] 9,564 9,564                
Investment, Identifier [Axis]: HBWM Holdings, LLC, Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[43]         4,717          
Investments at fair value [7],[43]         9,532          
Investment, Identifier [Axis]: HBWM Holdings, LLC.                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,767 4,767                
Investment, Identifier [Axis]: HP TLE Buyer, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9] 8,168 8,168                
Cost [4],[5] 8,128 8,128                
Investments at fair value [4],[5] 8,127 8,127                
Investment, Identifier [Axis]: HP TLE Buyer, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,797 1,797                
Cost [4],[5],[10] (9) (9)                
Investments at fair value [4],[5],[10] (9) (9)                
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 22,500 [4],[9],[29] 22,500 [4],[9],[29]     22,500 [11],[28]          
Cost 22,441 [4],[29] 22,441 [4],[29]     22,441 [28]          
Investments at fair value 19,384 [4],[29] 19,384 [4],[29]     14,513 [28]          
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,208 [4],[9],[13],[14] 4,208 [4],[9],[13],[14]     4,208 [11],[15],[16]          
Cost 4,188 [4],[13],[14] 4,188 [4],[13],[14]     4,188 [15],[16]          
Investments at fair value 3,625 [4],[13],[14] 3,625 [4],[13],[14]     2,714 [15],[16]          
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 5,031 [4],[5],[9],[17] 5,031 [4],[5],[9],[17]     5,069 [7],[8],[11],[18]          
Cost 4,991 [4],[5],[17] 4,991 [4],[5],[17]     5,025 [7],[8],[18]          
Investments at fair value 5,031 [4],[5],[17] 5,031 [4],[5],[17]     5,069 [7],[8],[18]          
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,229 1,229                
Cost [4],[5],[10] (12) (12)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,229          
Cost [7],[8],[12]         (12)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,779 [4],[5],[9],[17] 3,779 [4],[5],[9],[17]     3,808 [7],[8],[11],[18]          
Cost 3,779 [4],[5],[17] 3,779 [4],[5],[17]     3,808 [7],[8],[18]          
Investments at fair value 3,779 [4],[5],[17] 3,779 [4],[5],[17]     3,808 [7],[8],[18]          
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,556 [4],[5],[9],[10] 4,556 [4],[5],[9],[10]     2,313 [7],[8],[11],[12]          
Cost 4,537 [4],[5],[10] 4,537 [4],[5],[10]     2,302 [7],[8],[12]          
Investments at fair value 4,556 [4],[5],[10] 4,556 [4],[5],[10]     2,313 [7],[8],[12]          
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,402 [4],[5],[9],[10] 3,402 [4],[5],[9],[10]     5,676 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 14,373 [5],[9],[17] 14,373 [5],[9],[17]     14,484 [8],[11],[18]          
Cost 14,059 [5],[17] 14,059 [5],[17]     14,108 [8],[18]          
Investments at fair value 12,917 [5],[17] 12,917 [5],[17]     14,291 [8],[18]          
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,780 [4],[5],[9],[10] 3,780 [4],[5],[9],[10]     3,780 [7],[8],[11],[12]          
Cost (38) [4],[5],[10] (38) [4],[5],[10]     (38) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 32,553 [4],[9],[13],[14] 32,553 [4],[9],[13],[14]     32,799 [7],[11],[15],[16]          
Cost 32,399 [4],[13],[14] 32,399 [4],[13],[14]     32,611 [7],[15],[16]          
Investments at fair value 32,553 [4],[13],[14] 32,553 [4],[13],[14]     32,799 [7],[15],[16]          
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,523 [4],[5],[9],[17] 2,523 [4],[5],[9],[17]     2,542 [7],[8],[11],[18]          
Cost 2,523 [4],[5],[17] 2,523 [4],[5],[17]     2,540 [7],[8],[18]          
Investments at fair value 2,523 [4],[5],[17] 2,523 [4],[5],[17]     2,542 [7],[8],[18]          
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 8,422 [4],[5],[9] 8,422 [4],[5],[9]     8,696 [7],[8],[11],[18]          
Cost 8,357 [4],[5] 8,357 [4],[5]     8,619 [7],[8],[18]          
Investments at fair value 8,422 [4],[5] 8,422 [4],[5]     8,696 [7],[8],[18]          
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 828 [4],[5],[9],[10] 828 [4],[5],[9],[10]     828 [7],[8],[11],[12]          
Cost (8) [4],[5],[10] (8) [4],[5],[10]     (8) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[20]         15,091          
Cost [7],[20]         14,961          
Investments at fair value [7],[20]         15,091          
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         2,012          
Cost [7],[8],[18]         2,006          
Investments at fair value [7],[8],[18]         2,012          
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,827 [4],[5],[9],[10] 3,827 [4],[5],[9],[10]     3,827 [7],[8],[11],[12]          
Cost (29) [4],[5],[10] (29) [4],[5],[10]     (29) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 18,372 [4],[9],[13],[14] 18,372 [4],[9],[13],[14]     18,372 [7],[11],[15],[16]          
Cost 18,305 [4],[13],[14] 18,305 [4],[13],[14]     18,291 [7],[15],[16]          
Investments at fair value 18,372 [4],[13],[14] 18,372 [4],[13],[14]     18,372 [7],[15],[16]          
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,704 [4],[5],[9],[17] 7,704 [4],[5],[9],[17]     7,764 [7],[8],[11],[18]          
Cost 7,663 [4],[5],[17] 7,663 [4],[5],[17]     7,713 [7],[8],[18]          
Investments at fair value 7,704 [4],[5],[17] 7,704 [4],[5],[17]     7,764 [7],[8],[18]          
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 16,953 [4],[5],[9] 16,953 [4],[5],[9]     16,953 [7],[8],[11]          
Cost 16,816 [4],[5] 16,816 [4],[5]     16,795 [7],[8]          
Investments at fair value 16,953 [4],[5] 16,953 [4],[5]     16,953 [7],[8]          
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18],[24]         7,091          
Cost [7],[8],[18],[24]         6,405          
Investments at fair value [7],[8],[18],[24]         6,331          
Investment, Identifier [Axis]: Ivy Hill Middle Market Credit Fund, Ltd, Structured Finance Obligation                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[23] 3,232 3,232                
Cost [4],[5],[23] 3,232 3,232                
Investments at fair value [4],[5],[23] 3,257 3,257                
Investment, Identifier [Axis]: Ivy Hill Middle Market Credit Fund, Ltd, Structured Finance Obligations                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [8],[24]         3,232          
Investments at fair value [8],[24]         3,232          
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         19          
Cost [7],[8],[12]         19          
Investments at fair value [7],[8],[12]         18          
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,568          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         (47)          
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 6,774 [4],[5],[9],[17] 6,774 [4],[5],[9],[17]     6,827 [7],[8],[11],[18]          
Cost 6,739 [4],[5],[17] 6,739 [4],[5],[17]     6,785 [7],[8],[18]          
Investments at fair value 6,283 [4],[5],[17] 6,283 [4],[5],[17]     6,570 [7],[8],[18]          
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,140 [4],[5],[9],[17] 1,140 [4],[5],[9],[17]     1,149 [7],[8],[11],[18]          
Cost 1,133 [4],[5],[17] 1,133 [4],[5],[17]     1,140 [7],[8],[18]          
Investments at fair value 1,057 [4],[5],[17] 1,057 [4],[5],[17]     1,106 [7],[8],[18]          
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 776 [4],[5],[9],[17] 776 [4],[5],[9],[17]     782 [7],[8],[11],[18]          
Cost 772 [4],[5],[17] 772 [4],[5],[17]     777 [7],[8],[18]          
Investments at fair value 720 [4],[5],[17] 720 [4],[5],[17]     752 [7],[8],[18]          
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9] 19 19                
Cost [4],[5] 18 18                
Investments at fair value [4],[5] 17 17                
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12],[18]         973          
Cost [7],[8],[12],[18]         966          
Investments at fair value [7],[8],[12],[18]         973          
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         751          
Cost [7],[8],[12]         746          
Investments at fair value [7],[8],[12]         751          
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         2,865          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         2,888          
Cost [7],[8],[12]         (22)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Kaseya Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         64,124          
Cost [7],[15],[16]         63,786          
Investments at fair value [7],[15],[16]         64,124          
Investment, Identifier [Axis]: Kaseya Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         238          
Cost [7],[8],[18]         237          
Investments at fair value [7],[8],[18]         238          
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10],[17] 990 990                
Cost [4],[5],[10],[17] 985 985                
Investments at fair value [4],[5],[10],[17] 990 990                
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 810 [4],[5],[9],[10] 810 [4],[5],[9],[10]     1,799 [7],[8],[11],[12]          
Cost (4) [4],[5],[10] (4) [4],[5],[10]     (9) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 14,513 [4],[9],[29] 14,513 [4],[9],[29]     14,635 [7],[11],[28]          
Cost 14,500 [4],[29] 14,500 [4],[29]     14,617 [7],[28]          
Investments at fair value 14,513 [4],[29] 14,513 [4],[29]     14,635 [7],[28]          
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,248 [4],[9],[29] 1,248 [4],[9],[29]     2,268 [7],[11],[28]          
Cost 1,242 [4],[29] 1,242 [4],[29]     2,254 [7],[28]          
Investments at fair value 1,248 [4],[29] 1,248 [4],[29]     2,268 [7],[28]          
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,483 [4],[9],[13],[14] 3,483 [4],[9],[13],[14]     3,509 [7],[11],[15],[16]          
Cost 3,454 [4],[13],[14] 3,454 [4],[13],[14]     3,477 [7],[15],[16]          
Investments at fair value 3,483 [4],[13],[14] 3,483 [4],[13],[14]     3,509 [7],[15],[16]          
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 161 [4],[5],[9],[10] 161 [4],[5],[9],[10]     162 [7],[8],[11],[12]          
Cost 160 [4],[5],[10] 160 [4],[5],[10]     161 [7],[8],[12]          
Investments at fair value 161 [4],[5],[10] 161 [4],[5],[10]     162 [7],[8],[12]          
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,398 [4],[5],[9],[10] 1,398 [4],[5],[9],[10]     1,398 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 468 [4],[5],[9],[10] 468 [4],[5],[9],[10]     468 [7],[8],[11],[12]          
Cost (5) [4],[5],[10] (5) [4],[5],[10]     (5) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc., Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 12,400 12,400                
Cost 12,324 [4],[5],[44] 12,324 [4],[5],[44]     20,819 [7],[8],[45]          
Investments at fair value 12,400 [4],[5],[44] 12,400 [4],[5],[44]     21,010 [7],[8],[45]          
Investment, Identifier [Axis]: LSCS Holdings, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [9],[13],[14] 5,155 5,155                
Cost [13],[14] 5,056 5,056                
Investments at fair value [13],[14] 5,086 5,086                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 6,206 [4],[9],[29] 6,206 [4],[9],[29]     6,124 [7],[11],[28]          
Cost 6,153 [4],[29] 6,153 [4],[29]     6,065 [7],[28]          
Investments at fair value 6,206 [4],[29] 6,206 [4],[29]     6,062 [7],[28]          
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         72          
Cost [7],[8],[12]         71          
Investments at fair value [7],[8],[12]         71          
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[10],[29] 221 221                
Cost [4],[10],[29] 219 219                
Investments at fair value [4],[10],[29] 221 221                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 72 72                
Cost [4],[5],[10] 71 71                
Investments at fair value [4],[5],[10] 72 72                
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 136 [4],[9],[10],[29] 136 [4],[9],[10],[29]     358 [7],[11],[12],[28]          
Cost 0 [4],[10],[29] 0 [4],[10],[29]     0 [7],[12],[28]          
Investments at fair value 0 [4],[10],[29] 0 [4],[10],[29]     (4) [7],[12],[28]          
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 644 [4],[5],[9],[10] 644 [4],[5],[9],[10]     644 [7],[8],[11],[12]          
Cost (6) [4],[5],[10] (6) [4],[5],[10]     (6) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (6) [7],[8],[12]          
Investment, Identifier [Axis]: Logrhythm, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,196 [4],[5],[9] 4,196 [4],[5],[9]     4,196 [7],[8],[11],[18]          
Cost 4,145 [4],[5] 4,145 [4],[5]     4,138 [7],[8],[18]          
Investments at fair value 4,047 [4],[5] 4,047 [4],[5]     4,196 [7],[8],[18]          
Investment, Identifier [Axis]: Logrhythm, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 420 [4],[5],[9],[10] 420 [4],[5],[9],[10]     420 [7],[8],[11],[12]          
Cost (6) [4],[5],[10] (6) [4],[5],[10]     (6) [7],[8],[12]          
Investments at fair value (15) [4],[5],[10] (15) [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Low Voltage Holdings Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 16,902 16,902                
Cost [4],[5],[17] 16,841 16,841                
Investments at fair value [4],[5],[17] 16,839 16,839                
Investment, Identifier [Axis]: Low Voltage Holdings Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 819 819                
Cost [4],[5],[10] (3) (3)                
Investments at fair value [4],[5],[10] (3) (3)                
Investment, Identifier [Axis]: Low Voltage Holdings Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 2,317 2,317                
Cost [4],[5],[10] (9) (9)                
Investments at fair value [4],[5],[10] (9) (9)                
Investment, Identifier [Axis]: Low Voltage Holdings Inc., First lien - Undrawn 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 5,257 5,257                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] (19) (19)                
Investment, Identifier [Axis]: MRI Software LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 200 [4],[5],[9],[10] 200 [4],[5],[9],[10]     111 [7],[8],[11],[12]          
Cost 199 [4],[5],[10] 199 [4],[5],[10]     111 [7],[8],[12]          
Investments at fair value 200 [4],[5],[10] 200 [4],[5],[10]     111 [7],[8],[12]          
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,802 [4],[5],[9],[10] 1,802 [4],[5],[9],[10]     1,891 [7],[8],[11],[12]          
Cost (9) [4],[5],[10] (9) [4],[5],[10]     (9) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 21,261 [4],[9],[29] 21,261 [4],[9],[29]     21,430 [7],[11],[28]          
Cost 21,240 [4],[29] 21,240 [4],[29]     21,398 [7],[28]          
Investments at fair value 21,261 [4],[29] 21,261 [4],[29]     21,430 [7],[28]          
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,532 [4],[5],[9],[17] 7,532 [4],[5],[9],[17]     7,591 [7],[8],[11],[18]          
Cost 7,524 [4],[5],[17] 7,524 [4],[5],[17]     7,580 [7],[8],[18]          
Investments at fair value 7,532 [4],[5],[17] 7,532 [4],[5],[17]     7,591 [7],[8],[18]          
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,486 [4],[9],[13],[14] 4,486 [4],[9],[13],[14]     4,521 [7],[11],[15],[16]          
Cost 4,483 [4],[13],[14] 4,483 [4],[13],[14]     4,516 [7],[15],[16]          
Investments at fair value 4,486 [4],[13],[14] 4,486 [4],[13],[14]     4,521 [7],[15],[16]          
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,083 [4],[9],[13],[14] 3,083 [4],[9],[13],[14]     3,107 [7],[11],[15],[16]          
Cost 3,080 [4],[13],[14] 3,080 [4],[13],[14]     3,103 [7],[15],[16]          
Investments at fair value 3,083 [4],[13],[14] 3,083 [4],[13],[14]     3,107 [7],[15],[16]          
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 787 [4],[5],[9],[17] 787 [4],[5],[9],[17]     793 [7],[8],[11],[18]          
Cost 786 [4],[5],[17] 786 [4],[5],[17]     792 [7],[8],[18]          
Investments at fair value 787 [4],[5],[17] 787 [4],[5],[17]     793 [7],[8],[18]          
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 55 55                
Cost [4],[5],[10] 55 55                
Investments at fair value [4],[5],[10] 55 55                
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 3,692 3,692                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Mai Capital Management Intermediate LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 252 252                
Cost [4],[5],[10] (1) (1)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Michael Baker International, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [8],[11],[18]         4,892          
Cost [8],[18]         4,869          
Investments at fair value [8],[18]         4,910          
Investment, Identifier [Axis]: Model N, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         44,218          
Cost [7],[15],[16]         44,008          
Investments at fair value [7],[15],[16]         43,997          
Investment, Identifier [Axis]: Model N, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 43,885 43,885                
Cost [4],[13],[14] 43,696 43,696                
Investments at fair value [4],[13],[14] 43,885 43,885                
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 9,047 [4],[5],[9],[10] 9,047 [4],[5],[9],[10]     4,825 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     (24) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (24) [7],[8],[12]          
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,825 [4],[5],[9],[10] 4,825 [4],[5],[9],[10]     9,047 [7],[8],[11],[12]          
Cost (24) [4],[5],[10] (24) [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (45) [7],[8],[12]          
Investment, Identifier [Axis]: NC Topco, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 5,877 [4],[9],[13],[14] 5,877 [4],[9],[13],[14]     5,853 [7],[11],[15],[16]          
Cost 5,851 [4],[13],[14] 5,851 [4],[13],[14]     5,825 [7],[15],[16]          
Investments at fair value 5,877 [4],[13],[14] 5,877 [4],[13],[14]     5,824 [7],[15],[16]          
Investment, Identifier [Axis]: NC Topco, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,672 [4],[5],[9],[10] 1,672 [4],[5],[9],[10]     669 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     (3) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (3) [7],[8],[12]          
Investment, Identifier [Axis]: NC Topco, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 669 [4],[5],[9],[10] 669 [4],[5],[9],[10]     1,672 [7],[8],[11],[12]          
Cost (3) [4],[5],[10] (3) [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     (8) [7],[8],[12]          
Investment, Identifier [Axis]: NHME Holdings Corp., Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 4,000 [4],[5],[46],[47] 4,000 [4],[5],[46],[47]     4,000 [7],[8],[48],[49]          
Investments at fair value 0 [4],[5],[46],[47] 0 [4],[5],[46],[47]     0 [7],[8],[48],[49]          
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 1,000 [4],[5],[46],[47] 1,000 [4],[5],[46],[47]     1,000 [7],[8],[48],[49]          
Investments at fair value 0 [4],[5],[46],[47] 0 [4],[5],[46],[47]     0 [7],[8],[48],[49]          
Investment, Identifier [Axis]: NM GP Holdco, LLC, Membership interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 850 [4],[23],[47],[50] 850 [4],[23],[47],[50]     850 [7],[24],[49],[51]          
Investments at fair value 393 [4],[23],[47],[50] 393 [4],[23],[47],[50]     322 [7],[24],[49],[51]          
Investment, Identifier [Axis]: NM NL Holdings, L.P., Membership interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 74,248 [4],[23],[47],[50] 74,248 [4],[23],[47],[50]     74,248 [7],[24],[49],[51]          
Investments at fair value 105,878 [4],[23],[47],[50] 105,878 [4],[23],[47],[50]     104,512 [7],[24],[49],[51]          
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 6,272 [4],[47],[50] 6,272 [4],[47],[50]     6,272 [7],[49],[51]          
Investments at fair value 8,673 [4],[47],[50] 8,673 [4],[47],[50]     9,960 [7],[49],[51]          
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         19,259          
Cost [7],[8],[18]         19,106          
Investments at fair value [7],[8],[18]         19,259          
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         5,012          
Cost [7],[8],[18]         4,996          
Investments at fair value [7],[8],[18]         5,012          
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         4,913          
Cost [7],[15],[16]         4,874          
Investments at fair value [7],[15],[16]         4,913          
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC, Membership interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 160,000 [4],[5],[23],[47] 160,000 [4],[5],[23],[47]     160,000 [7],[8],[24],[49]          
Investments at fair value 160,000 [4],[5],[23],[47] 160,000 [4],[5],[23],[47]     160,000 [7],[8],[24],[49]          
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC, Membership interest                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 112,400 [4],[5],[23],[47] 112,400 [4],[5],[23],[47]     112,400 [7],[8],[24],[49]          
Investments at fair value 112,400 [4],[5],[23],[47] 112,400 [4],[5],[23],[47]     112,400 [7],[8],[24],[49]          
Investment, Identifier [Axis]: National HME, Inc., Second lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 8,281 [4],[5],[9],[46],[47] 8,281 [4],[5],[9],[46],[47]     8,281 [7],[8],[11],[48],[49]          
Cost 7,872 [4],[5],[46],[47] 7,872 [4],[5],[46],[47]     7,871 [7],[8],[48],[49]          
Investments at fair value 3,000 [4],[5],[46],[47] 3,000 [4],[5],[46],[47]     3,000 [7],[8],[48],[49]          
Investment, Identifier [Axis]: National HME, Inc., Second lien, Non-accrual status                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Unearned interest income 541 1,554                
Investment, Identifier [Axis]: Nelipak Holding Company First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount         17,109          
Investment, Identifier [Axis]: Nelipak Holding Company First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount         406          
Investment, Identifier [Axis]: Nelipak Holding Company First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount         6,638          
Investment, Identifier [Axis]: Nelipak Holding Company First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount         833          
Investment, Identifier [Axis]: Nelipak Holding Company, Drawn Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 92 92                
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,620 [4],[5],[9],[10],[17],[52] 1,620 [4],[5],[9],[10],[17],[52]     1,097 [7],[8],[11],[12],[18],[53]          
Cost 1,608 [4],[5],[10],[17],[52] 1,608 [4],[5],[10],[17],[52]     1,089 [7],[8],[12],[18],[53]          
Investments at fair value 1,620 [4],[5],[10],[17],[52] 1,620 [4],[5],[10],[17],[52]     1,097 [7],[8],[12],[18],[53]          
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount     € 78 [10]   392 [7],[8],[11],[12]          
Cost 90 [4],[5],[10] 90 [4],[5],[10]     406 [7],[8],[12]          
Investments at fair value 92 [4],[5],[10] 92 [4],[5],[10]     405 [7],[8],[12]          
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,501 [4],[5],[9],[10] 3,501 [4],[5],[9],[10]     3,501 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount | €     6,411 [10],[17],[52]     € 6,411 [12]        
Cost 0 [4],[5],[10],[17],[52] 0 [4],[5],[10],[17],[52]     0 [7],[8],[12],[18],[53]          
Investments at fair value 0 [4],[5],[10],[17],[52] 0 [4],[5],[10],[17],[52]     0 [7],[8],[12],[18],[53]          
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 993 [4],[5],[9],[10] 993 [4],[5],[9],[10]       804 [12]        
Cost (7) [4],[5],[10] (7) [4],[5],[10]     (6) [7],[8],[12],[18],[53]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12],[18],[53]          
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount     1,118 [10],[17],[52]   1,515 [7],[8],[11],[12]          
Cost (8) [4],[5],[10],[17],[52] (8) [4],[5],[10],[17],[52]     (11) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10],[17],[52] 0 [4],[5],[10],[17],[52]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 19,243 19,243 € 16,399 [17],[52]     € 16,523        
Cost 17,644 [4],[5],[17],[52] 17,644 [4],[5],[17],[52]     17,776 [7],[8],[18],[53]          
Investments at fair value 19,241 [4],[5],[17],[52] 19,241 [4],[5],[17],[52]     17,108 [7],[8],[18],[53]          
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 8,955 [4],[9],[13],[14] 8,955 [4],[9],[13],[14]     9,023 [7],[11],[15],[16]          
Cost 8,899 [4],[13],[14] 8,899 [4],[13],[14]     8,961 [7],[15],[16]          
Investments at fair value 8,955 [4],[13],[14] 8,955 [4],[13],[14]     9,023 [7],[15],[16]          
Investment, Identifier [Axis]: Nelipak Holding Company, Undrawn Delayed Draw Term Loan                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,522 7,522                
Investment, Identifier [Axis]: Nelipak Holding Company, Undrawn Revolver                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,311 1,311                
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 50,388 [4],[9],[14],[47] 50,388 [4],[9],[14],[47]     46,068 [7],[11],[16],[49]          
Cost 50,388 [4],[14],[47] 50,388 [4],[14],[47]     46,068 [7],[16],[49]          
Investments at fair value 50,388 [4],[14],[47] 50,388 [4],[14],[47]     46,068 [7],[16],[49]          
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 39,834 [4],[5],[9],[17],[47] 39,834 [4],[5],[9],[17],[47]     33,155 [7],[8],[11],[18],[49]          
Cost 39,834 [4],[5],[17],[47] 39,834 [4],[5],[17],[47]     33,155 [7],[8],[18],[49]          
Investments at fair value 39,834 [4],[5],[17],[47] 39,834 [4],[5],[17],[47]     33,155 [7],[8],[18],[49]          
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 26,071 [4],[5],[9],[47] 26,071 [4],[5],[9],[47]     23,814 [7],[8],[11],[49]          
Cost 25,550 [4],[5],[47] 25,550 [4],[5],[47]     22,942 [7],[8],[49]          
Investments at fair value 20,857 [4],[5],[47] 20,857 [4],[5],[47]     19,051 [7],[8],[49]          
Investment, Identifier [Axis]: New Benevis Topco, LLC, Common stock 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[14],[47] 27,154 27,154                
Investments at fair value [4],[14],[47] 27,721 27,721                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Common stock 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[5],[47] 12,768 12,768                
Investments at fair value [4],[5],[47] 12,992 12,992                
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[16],[49]         27,154          
Investments at fair value [7],[16],[49]         28,481          
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8],[49]         12,768          
Investments at fair value [7],[8],[49]         13,347          
Investment, Identifier [Axis]: New Permian Holdco, Inc., Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 11,155 [4],[5],[47] 11,155 [4],[5],[47]     11,155 [7],[8],[49]          
Investments at fair value 13,000 [4],[5],[47] 13,000 [4],[5],[47]     18,900 [7],[8],[49]          
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 23,336 [4],[5],[9],[17],[47] 23,336 [4],[5],[9],[17],[47]     23,336 [7],[8],[11],[18],[49]          
Cost 23,336 [4],[5],[17],[47] 23,336 [4],[5],[17],[47]     23,336 [7],[8],[18],[49]          
Investments at fair value 23,336 [4],[5],[17],[47] 23,336 [4],[5],[17],[47]     23,336 [7],[8],[18],[49]          
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10],[17],[47] 26,998 26,998                
Cost [4],[5],[10],[17],[47] 26,998 26,998                
Investments at fair value [4],[5],[10],[17],[47] 26,998 26,998                
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12],[18],[49]         20,840          
Cost [7],[8],[12],[18],[49]         20,840          
Investments at fair value [7],[8],[12],[18],[49]         20,840          
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,897 [4],[5],[9],[10],[47] 4,897 [4],[5],[9],[10],[47]     1,055 [7],[8],[11],[12],[49]          
Cost 0 [4],[5],[10],[47] 0 [4],[5],[10],[47]     0 [7],[8],[12],[49]          
Investments at fair value 0 [4],[5],[10],[47] 0 [4],[5],[10],[47]     0 [7],[8],[12],[49]          
Investment, Identifier [Axis]: Next Holdco, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 6,280 [4],[9],[13],[14] 6,280 [4],[9],[13],[14]     3,494 [7],[11],[15],[16]          
Cost 6,247 [4],[13],[14] 6,247 [4],[13],[14]     3,471 [7],[15],[16]          
Investments at fair value 6,280 [4],[13],[14] 6,280 [4],[13],[14]     3,494 [7],[15],[16]          
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         903          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         339          
Cost [7],[8],[12]         (3)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 903 903                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 339 339                
Cost [4],[5],[10] (3) (3)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Notorious Topco, LLC , First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 21,816 21,816                
Investments at fair value 13,715 13,715                
Unearned income 879 879                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 880 880                
Cost [4],[5],[10] 874 874                
Investments at fair value [4],[5],[10] 551 551                
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         880          
Cost [7],[8],[12]         (7)          
Investments at fair value [7],[8],[12]         (71)          
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 10,135 [4],[5],[9],[17] 10,135 [4],[5],[9],[17]     10,058 [7],[8],[11],[18]          
Cost 10,097 [4],[5],[17] 10,097 [4],[5],[17]     10,017 [7],[8],[18]          
Investments at fair value 6,345 [4],[5],[17] 6,345 [4],[5],[17]     9,241 [7],[8],[18]          
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 10,008 [4],[5],[9],[17] 10,008 [4],[5],[9],[17]     9,932 [7],[8],[11],[18]          
Cost 9,968 [4],[5],[17] 9,968 [4],[5],[17]     9,889 [7],[8],[18]          
Investments at fair value 6,266 [4],[5],[17] 6,266 [4],[5],[17]     9,126 [7],[8],[18]          
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 883 [4],[5],[9],[17] 883 [4],[5],[9],[17]     877 [7],[8],[11],[18]          
Cost 877 [4],[5],[17] 877 [4],[5],[17]     870 [7],[8],[18]          
Investments at fair value 553 [4],[5],[17] 553 [4],[5],[17]     805 [7],[8],[18]          
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12],[54]         3,600          
Cost [7],[8],[12],[54]         (36)          
Investments at fair value [7],[8],[12],[54]         0          
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         31,513          
Cost [7],[15],[16]         31,442          
Investments at fair value [7],[15],[16]         31,513          
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         27,425          
Cost [7],[15],[16]         27,248          
Investments at fair value [7],[15],[16]         27,425          
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         1,736          
Cost [7],[15],[16]         1,724          
Investments at fair value [7],[15],[16]         1,736          
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8],[54]         2,000          
Investments at fair value [7],[8],[54]         7,646          
Investment, Identifier [Axis]: OEConnection LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         46,430          
Cost [7],[15],[16]         46,214          
Investments at fair value [7],[15],[16]         46,430          
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [5],[9],[10] 5,063 5,063                
Cost [5],[10] (25) (25)                
Investments at fair value [5],[10] 0 0                
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         8,101          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         5,063          
Cost [7],[8],[12]         (25)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: OEConnection LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [9],[13],[14] 46,080 46,080                
Cost [13],[14] 45,885 45,885                
Investments at fair value [13],[14] 46,234 46,234                
Investment, Identifier [Axis]: OEConnection LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [5],[9],[17] 8,040 8,040                
Cost [5],[17] 8,004 8,004                
Investments at fair value [5],[17] 8,067 8,067                
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,860          
Cost [7],[8],[12]         (23)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         7,440          
Cost [7],[15],[16]         7,370          
Investments at fair value [7],[15],[16]         7,440          
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11]         7,440          
Cost [7],[8]         7,369          
Investments at fair value [7],[8]         7,440          
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11]         5,454          
Cost [7],[8]         5,404          
Investments at fair value [7],[8]         5,454          
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[20]         18,161          
Cost [7],[20]         18,078          
Investments at fair value [7],[20]         18,161          
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 732 [4],[5],[9],[10] 732 [4],[5],[9],[10]     2,360 [7],[11],[12],[20]          
Cost 728 [4],[5],[10] 728 [4],[5],[10]     2,348 [7],[12],[20]          
Investments at fair value 732 [4],[5],[10] 732 [4],[5],[10]     2,360 [7],[12],[20]          
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,098 1,098                
Cost [4],[5],[10] (5) (5)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[12],[20]         1,865          
Cost [7],[12],[20]         0          
Investments at fair value [7],[12],[20]         0          
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,830          
Cost [7],[8],[12]         (9)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[19] 22,227 22,227                
Cost [4],[19] 22,133 22,133                
Investments at fair value [4],[19] 22,227 22,227                
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 510 510                
Cost [4],[5],[17] 510 510                
Investments at fair value [4],[5],[17] 510 510                
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 486 [4],[5],[9],[10] 486 [4],[5],[9],[10]     486 [7],[8],[11],[12]          
Cost (5) [4],[5],[10] (5) [4],[5],[10]     (5) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 22,219 [4],[9],[19] 22,219 [4],[9],[19]     22,388 [7],[11],[20]          
Cost 22,172 [4],[19] 22,172 [4],[19]     22,332 [7],[20]          
Investments at fair value 22,219 [4],[19] 22,219 [4],[19]     22,388 [7],[20]          
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         8,258          
Cost [7],[15],[16]         8,258          
Investments at fair value [7],[15],[16]         8,258          
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 8,196 8,196                
Cost [4],[13],[14] 8,196 8,196                
Investments at fair value [4],[13],[14] 8,196 8,196                
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 14,500 [4],[5],[9] 14,500 [4],[5],[9]     14,500 [7],[8],[11]         $ 20,000
Cost 14,500 [4],[5] 14,500 [4],[5]     14,500 [7],[8]          
Investments at fair value 6,525 [4],[5] 6,525 [4],[5]     6,525 [7],[8]          
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 0 [9],[55],[56] 0 [9],[55],[56]     0 [11],[57],[58]          
Cost 0 [55],[56] 0 [55],[56]     0 [57],[58]          
Investments at fair value 0 [55],[56] 0 [55],[56]     0 [57],[58]          
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         7,654          
Cost [7],[15],[16]         7,635          
Investments at fair value [7],[15],[16]         7,635          
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 312 [5],[9],[10],[17] 312 [5],[9],[10],[17]     258 [7],[8],[11],[12],[18]          
Cost 312 [5],[10],[17] 312 [5],[10],[17]     258 [7],[8],[12],[18]          
Investments at fair value 312 [5],[10],[17] 312 [5],[10],[17]     258 [7],[8],[12],[18]          
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [5],[9],[10] 589 589                
Cost [5],[10] (1) (1)                
Investments at fair value [5],[10] 0 0                
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         643          
Cost [7],[8],[12]         (2)          
Investments at fair value [7],[8],[12]         (2)          
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,201          
Cost [7],[8],[12]         (3)          
Investments at fair value [7],[8],[12]         (3)          
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [9],[13],[14] 7,596 7,596                
Cost [13],[14] 7,579 7,579                
Investments at fair value [13],[14] 7,596 7,596                
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [5],[9] 622 622                
Cost [5] 619 619                
Investments at fair value [5] 621 621                
Investment, Identifier [Axis]: Permian Trust, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,409 [4],[5],[9],[33] 3,409 [4],[5],[9],[33]     3,409 [7],[8],[11],[34]          
Cost 0 [4],[5],[33] 0 [4],[5],[33]     0 [7],[8],[34]          
Investments at fair value 0 [4],[5],[33] 0 [4],[5],[33]     0 [7],[8],[34]          
Investment, Identifier [Axis]: Permian Trust, Trust Claim                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 247 [4],[9],[33],[59] 247 [4],[9],[33],[59]     247 [7],[11],[34],[60]          
Cost 0 [4],[33],[59] 0 [4],[33],[59]     0 [7],[34],[60]          
Investments at fair value 0 [4],[33],[59] 0 [4],[33],[59]     0 [7],[34],[60]          
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 27,932 [4],[5],[9],[17] 27,932 [4],[5],[9],[17]     28,145 [7],[11],[15],[16]          
Cost 27,708 [4],[5],[17] 27,708 [4],[5],[17]     27,895 [7],[15],[16]          
Investments at fair value 26,717 [4],[5],[17] 26,717 [4],[5],[17]     28,145 [7],[15],[16]          
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,708 [4],[5],[9],[10] 3,708 [4],[5],[9],[10]     3,708 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value (161) [4],[5],[10] (161) [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,708 [4],[5],[9],[10] 3,708 [4],[5],[9],[10]     3,708 [7],[8],[11],[12]          
Cost (37) [4],[5],[10] (37) [4],[5],[10]     (37) [7],[8],[12]          
Investments at fair value (161) [4],[5],[10] (161) [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,284 [4],[5],[9],[10],[61] 3,284 [4],[5],[9],[10],[61]     3,284 [7],[8],[11],[12],[62]          
Cost (26) [4],[5],[10],[61] (26) [4],[5],[10],[61]     (26) [7],[8],[12],[62]          
Investments at fair value 0 [4],[5],[10],[61] 0 [4],[5],[10],[61]     0 [7],[8],[12],[62]          
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 23,089 [4],[5],[9],[17] 23,089 [4],[5],[9],[17]     23,089 [7],[8],[11],[18]          
Cost 23,012 [4],[5],[17] 23,012 [4],[5],[17]     22,997 [7],[8],[18]          
Investments at fair value 23,089 [4],[5],[17] 23,089 [4],[5],[17]     23,089 [7],[8],[18]          
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,374 [4],[5],[9] 2,374 [4],[5],[9]     2,374 [7],[8],[11],[18]          
Cost 2,366 [4],[5] 2,366 [4],[5]     2,364 [7],[8],[18]          
Investments at fair value 2,374 [4],[5] 2,374 [4],[5]     2,374 [7],[8],[18]          
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Class A-2 common units                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[61],[63] 2,000 2,000                
Investments at fair value [4],[61],[63] 2,086 2,086                
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[62],[64]         2,000          
Investments at fair value [7],[62],[64]         2,000          
Investment, Identifier [Axis]: Planview Parent, Inc., Second lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 9,231 [4],[5],[9],[17] 9,231 [4],[5],[9],[17]     9,231 [11],[15],[16]          
Cost 9,211 [4],[5],[17] 9,211 [4],[5],[17]     9,208 [15],[16]          
Investments at fair value 8,952 [4],[5],[17] 8,952 [4],[5],[17]     9,208 [15],[16]          
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 22,218 [4],[9],[19] 22,218 [4],[9],[19]     22,387 [7],[11],[20]          
Cost 22,076 [4],[19] 22,076 [4],[19]     22,228 [7],[20]          
Investments at fair value 22,218 [4],[19] 22,218 [4],[19]     22,387 [7],[20]          
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 515 515                
Cost [4],[5],[10] 510 510                
Investments at fair value [4],[5],[10] 515 515                
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,775 [4],[5],[9],[10] 3,775 [4],[5],[9],[10]     4,289 [7],[8],[11],[12]          
Cost (38) [4],[5],[10] (38) [4],[5],[10]     (43) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 10,440 [4],[9],[29] 10,440 [4],[9],[29]     10,519 [7],[11],[28]          
Cost 10,396 [4],[29] 10,396 [4],[29]     10,470 [7],[28]          
Investments at fair value 10,441 [4],[29] 10,441 [4],[29]     10,519 [7],[28]          
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,510 [4],[5],[9],[10] 1,510 [4],[5],[9],[10]     1,510 [7],[8],[11],[12]          
Cost (8) [4],[5],[10] (8) [4],[5],[10]     (8) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Project Essential Super Parent, Inc., Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8]         15,929          
Investments at fair value [7],[8]         14,833          
Investment, Identifier [Axis]: RLG Holdings, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [11],[15],[16]         3,970          
Cost [15],[16]         3,970          
Investments at fair value [15],[16]         3,934          
Investment, Identifier [Axis]: RLG Holdings, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [9],[13],[14] 3,939 3,939                
Cost [13],[14] 3,939 3,939                
Investments at fair value [13],[14] 3,315 3,315                
Investment, Identifier [Axis]: RLG Holdings, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [9],[13],[14] 1,067 1,067                
Cost [13],[14] 883 883                
Investments at fair value [13],[14] 883 883                
Investment, Identifier [Axis]: RailPros Parent, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 5,843 5,843                
Cost [4],[13],[14] 5,815 5,815                
Investments at fair value [4],[13],[14] 5,813 5,813                
Investment, Identifier [Axis]: RailPros Parent, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 899 899                
Cost [4],[5],[10] (4) (4)                
Investments at fair value [4],[5],[10] (4) (4)                
Investment, Identifier [Axis]: RailPros Parent, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,798 1,798                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] (9) (9)                
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Trust Claim 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 152 [4],[9],[14] 152 [4],[9],[14]     152 [7],[11],[16]          
Cost 152 [4],[14] 152 [4],[14]     152 [7],[16]          
Investments at fair value 152 [4],[14] 152 [4],[14]     152 [7],[16]          
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Trust Claim 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 52 [4],[5],[9] 52 [4],[5],[9]     52 [7],[8],[11]          
Cost 52 [4],[5] 52 [4],[5]     52 [7],[8]          
Investments at fair value 52 [4],[5] 52 [4],[5]     52 [7],[8]          
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Warrants 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 182 [4],[14] 182 [4],[14]     182 [7],[16]          
Investments at fair value 272 [4],[14] 272 [4],[14]     327 [7],[16]          
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Warrants 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 62 [4],[5] 62 [4],[5]     62 [7],[8]          
Investments at fair value 93 [4],[5] 93 [4],[5]     112 [7],[8]          
Investment, Identifier [Axis]: Riskonnect Parent, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         6,349          
Cost [7],[8],[12]         0          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Riskonnect Parent, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 6,349 6,349                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Rithum Holdings, Inc. (fka CommerceHub, Inc.), First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [9],[13],[14] 7,111 7,111                
Cost [13],[14] 6,971 6,971                
Investments at fair value [13],[14] 7,118 7,118                
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         384          
Cost [7],[8],[12]         (2)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 166 [4],[5],[9],[10] 166 [4],[5],[9],[10]     128 [7],[8],[11],[12]          
Cost 165 [4],[5],[10] 165 [4],[5],[10]     127 [7],[8],[12]          
Investments at fair value 166 [4],[5],[10] 166 [4],[5],[10]     128 [7],[8],[12]          
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,390 [4],[9],[13],[14] 7,390 [4],[9],[13],[14]     7,446 [7],[11],[15],[16]          
Cost 7,375 [4],[13],[14] 7,375 [4],[13],[14]     7,425 [7],[15],[16]          
Investments at fair value 7,390 [4],[13],[14] 7,390 [4],[13],[14]     7,446 [7],[15],[16]          
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 1,511 [4],[5],[9],[17] 1,511 [4],[5],[9],[17]     1,523 [7],[8],[11],[18]          
Cost 1,511 [4],[5],[17] 1,511 [4],[5],[17]     1,523 [7],[8],[18]          
Investments at fair value 1,511 [4],[5],[17] 1,511 [4],[5],[17]     1,523 [7],[8],[18]          
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien- Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 345 345                
Cost [4],[5],[10] (2) (2)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 21,411 [4],[9],[13],[14] 21,411 [4],[9],[13],[14]     42,450 [7],[8],[11],[18]          
Cost 21,260 [4],[13],[14] 21,260 [4],[13],[14]     38,840 [7],[8],[18]          
Investments at fair value 21,250 [4],[13],[14] 21,250 [4],[13],[14]     42,450 [7],[8],[18]          
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 2,717 2,717                
Cost [4],[5],[10] (20) (20)                
Investments at fair value [4],[5],[10] (20) (20)                
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 11,501 [4],[14],[33] 11,501 [4],[14],[33]     11,501 [7],[16],[34]          
Investments at fair value 1,799 [4],[14],[33] 1,799 [4],[14],[33]     1,799 [7],[16],[34]          
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 1,282 [4],[5],[33] 1,282 [4],[5],[33]     1,282 [7],[8],[34]          
Investments at fair value 201 [4],[5],[33] 201 [4],[5],[33]     201 [7],[8],[34]          
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12],[18]         324          
Cost [7],[8],[12],[18]         319          
Investments at fair value [7],[8],[12],[18]         315          
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         235          
Cost [7],[8],[12]         (4)          
Investments at fair value [7],[8],[12]         (7)          
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         10,247          
Cost [7],[15],[16]         10,167          
Investments at fair value [7],[15],[16]         9,953          
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         77          
Cost [7],[8],[18]         76          
Investments at fair value [7],[8],[18]         75          
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc.                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 24,733 24,733                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[20]         16,363          
Investments at fair value [7],[20]         16,450          
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8],[18]         5,641          
Investments at fair value [7],[8],[18]         5,671          
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Series A preferred shares 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[19] 18,280 18,280                
Investments at fair value [4],[19] 17,609 17,609                
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Series A preferred shares 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[5],[17] 6,302 6,302                
Investments at fair value [4],[5],[17] 6,070 6,070                
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[20]         22,500          
Cost [7],[20]         22,397          
Investments at fair value [7],[20]         22,500          
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         5,697          
Cost [7],[15],[16]         5,706          
Investments at fair value [7],[15],[16]         5,697          
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,695 [4],[5],[9],[10] 2,695 [4],[5],[9],[10]     2,695 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 12,631 [4],[9],[14] 12,631 [4],[9],[14]     12,327 [7],[11],[16]          
Cost 12,153 [4],[14] 12,153 [4],[14]     11,782 [7],[16]          
Investments at fair value 8,161 [4],[14] 8,161 [4],[14]     10,402 [7],[16]          
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 10,169 [4],[5],[9],[17] 10,169 [4],[5],[9],[17]     9,925 [7],[8],[11]          
Cost 10,076 [4],[5],[17] 10,076 [4],[5],[17]     9,818 [7],[8]          
Investments at fair value 6,570 [4],[5],[17] 6,570 [4],[5],[17]     8,374 [7],[8]          
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,036 [4],[5],[9],[17] 4,036 [4],[5],[9],[17]     2,843 [7],[8],[11]          
Cost 2,794 [4],[5],[17] 2,794 [4],[5],[17]     2,317 [7],[8]          
Investments at fair value 2,581 [4],[5],[17] 2,581 [4],[5],[17]     2,351 [7],[8]          
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 328 [4],[9],[14] 328 [4],[9],[14]     302 [7],[11],[16]          
Cost 328 [4],[14] 328 [4],[14]     302 [7],[16]          
Investments at fair value 328 [4],[14] 328 [4],[14]     302 [7],[16]          
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 316 [4],[5],[9] 316 [4],[5],[9]     291 [7],[8],[11]          
Cost 316 [4],[5] 316 [4],[5]     291 [7],[8]          
Investments at fair value 316 [4],[5] 316 [4],[5]     291 [7],[8]          
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Class B-1 Common Shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 48,080 48,080                
Cost [4],[5],[33] 43,212 43,212                
Investments at fair value [4],[5],[33] 40,481 40,481                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Class B-2 Common Shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 29,707 29,707                
Cost [4],[5],[33] 24,839 24,839                
Investments at fair value [4],[5],[33] 0 0                
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8],[34]         66,651          
Investments at fair value [7],[8],[34]         59,978          
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Preferred shares                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8],[34]         7,525          
Investments at fair value [7],[8],[34]         9,352          
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Series C-2 Preferred Units                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [4],[5],[33] 8,404 8,404                
Investments at fair value [4],[5],[33] 8,404 8,404                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18],[24]         19,418          
Cost [7],[8],[18],[24]         19,326          
Investments at fair value [7],[8],[18],[24]         19,321          
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 19,815 19,815                
Cost [4],[5],[17] 19,852 19,852                
Investments at fair value [4],[5],[17] 19,815 19,815                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 16,245 16,245                
Cost [4],[13],[14] 16,245 16,245                
Investments at fair value [4],[13],[14] 16,245 16,245                
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 881 881                
Cost [4],[13],[14] 881 881                
Investments at fair value [4],[13],[14] 881 881                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         29,868          
Cost [7],[15],[16]         29,689          
Investments at fair value [7],[15],[16]         29,868          
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,273 [4],[9],[10],[14] 3,273 [4],[9],[10],[14]     2,440 [7],[11],[12],[16]          
Cost 3,273 [4],[10],[14] 3,273 [4],[10],[14]     2,440 [7],[12],[16]          
Investments at fair value 3,273 [4],[10],[14] 3,273 [4],[10],[14]     2,440 [7],[12],[16]          
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 468 [4],[9],[10],[14] 468 [4],[9],[10],[14]     1,301 [7],[11],[12],[16]          
Cost 0 [4],[10],[14] 0 [4],[10],[14]     0 [7],[12],[16]          
Investments at fair value 0 [4],[10],[14] 0 [4],[10],[14]     0 [7],[12],[16]          
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 46 [4],[5],[9],[10] 46 [4],[5],[9],[10]     4,267 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     (43) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 4,267 4,267                
Cost [4],[5],[10] (43) (43)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 29,868 29,868                
Cost [4],[5],[17] 29,714 29,714                
Investments at fair value [4],[5],[17] 29,868 29,868                
Investment, Identifier [Axis]: TigerConnect, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 3,054 3,054                
Cost [4],[5],[17] 3,032 3,032                
Investments at fair value [4],[5],[17] 3,054 3,054                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,501 1,501                
Cost [4],[5],[10] (15) (15)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[12],[15],[16]         785          
Cost [7],[12],[15],[16]         0          
Investments at fair value [7],[12],[15],[16]         0          
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[12]         1,501          
Cost [7],[8],[12]         (15)          
Investments at fair value [7],[8],[12]         0          
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 15,343 [4],[9],[13],[14] 15,343 [4],[9],[13],[14]     15,382 [7],[11],[15],[16]          
Cost 15,280 [4],[13],[14] 15,280 [4],[13],[14]     15,303 [7],[15],[16]          
Investments at fair value 15,343 [4],[13],[14] 15,343 [4],[13],[14]     15,382 [7],[15],[16]          
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 5,145 [4],[9],[13],[14] 5,145 [4],[9],[13],[14]     4,467 [7],[11],[15],[16]          
Cost 5,118 [4],[13],[14] 5,118 [4],[13],[14]     4,438 [7],[15],[16]          
Investments at fair value 5,145 [4],[13],[14] 5,145 [4],[13],[14]     4,467 [7],[15],[16]          
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 893 [4],[5],[9],[10] 893 [4],[5],[9],[10]     893 [7],[8],[11],[12]          
Cost (9) [4],[5],[10] (9) [4],[5],[10]     (9) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 6,930 [4],[5],[9],[17] 6,930 [4],[5],[9],[17]     6,984 [7],[8],[11],[18]          
Cost 6,897 [4],[5],[17] 6,897 [4],[5],[17]     6,946 [7],[8],[18]          
Investments at fair value 6,930 [4],[5],[17] 6,930 [4],[5],[17]     6,984 [7],[8],[18]          
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 5,498 [4],[9],[13],[14] 5,498 [4],[9],[13],[14]     5,541 [7],[11],[15],[16]          
Cost 5,473 [4],[13],[14] 5,473 [4],[13],[14]     5,512 [7],[15],[16]          
Investments at fair value 5,498 [4],[13],[14] 5,498 [4],[13],[14]     5,541 [7],[15],[16]          
Investment, Identifier [Axis]: Ultimus Group Midco, LLC, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 9,116 9,116                
Cost [4],[5],[17] 9,071 9,071                
Investments at fair value [4],[5],[17] 9,070 9,070                
Investment, Identifier [Axis]: Ultimus Group Midco, LLC, First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 3,039 3,039                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: Ultimus Group Midco, LLC, First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,139 1,139                
Cost [4],[5],[10] (6) (6)                
Investments at fair value [4],[5],[10] (6) (6)                
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 1,925 [4],[14],[47] 1,925 [4],[14],[47]     1,925 [7],[16],[49]          
Investments at fair value 0 [4],[14],[47] 0 [4],[14],[47]     0 [7],[16],[49]          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 532 [4],[5],[47] 532 [4],[5],[47]     532 [7],[8],[49]          
Investments at fair value 0 [4],[5],[47] 0 [4],[5],[47]     0 [7],[8],[49]          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 58,091 [4],[5],[47] 58,091 [4],[5],[47]     22,803 [7],[8],[49]          
Investments at fair value 61,415 [4],[5],[47] 61,415 [4],[5],[47]     20,646 [7],[8],[49]          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 29,318 [4],[5],[47] 29,318 [4],[5],[47]     13,553 [7],[8],[49]          
Investments at fair value 8,675 [4],[5],[47] 8,675 [4],[5],[47]     12,682 [7],[8],[49]          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 26,946 [4],[14],[47] 26,946 [4],[14],[47]     19,795 [7],[8],[49]          
Investments at fair value 0 [4],[14],[47] 0 [4],[14],[47]     3,080 [7],[8],[49]          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost 7,447 [4],[5],[47] 7,447 [4],[5],[47]     26,946 [7],[16],[49]          
Investments at fair value 0 [4],[5],[47] 0 [4],[5],[47]     0 [7],[16],[49]          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8],[49]         7,447          
Investments at fair value [7],[8],[49]         0          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[49]         15,608          
Cost [7],[8],[49]         15,608          
Investments at fair value [7],[8],[49]         15,459          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[49]         6,919          
Cost [7],[8],[49]         6,919          
Investments at fair value [7],[8],[49]         6,853          
Investment, Identifier [Axis]: UniTek Global Services, Inc., Warrants                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Cost [7],[8],[49]         0          
Investments at fair value [7],[8],[49]         48,804          
Investment, Identifier [Axis]: Vehlo Purchaser, LLC, First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 6,073 6,073                
Cost [4],[5],[10] 6,032 6,032                
Investments at fair value [4],[5],[10] 6,042 6,042                
Investment, Identifier [Axis]: Vehlo Purchaser, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 3,897 3,897                
Cost [4],[5],[10] (39) (39)                
Investments at fair value [4],[5],[10] (19) (19)                
Investment, Identifier [Axis]: Viper Bidco,Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 16,059 16,059                
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount       £ 11,940 12,030 [7],[8],[11],[18],[53]          
Cost 15,066 [4],[5],[17],[52] 15,066 [4],[5],[17],[52]     15,181 [7],[8],[18],[53]          
Investments at fair value 15,979 [4],[5],[17],[52] 15,979 [4],[5],[17],[52]     14,981 [7],[8],[18],[53]          
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 3,320 [4],[5],[9],[10] 3,320 [4],[5],[9],[10]     4,150 [7],[8],[11],[12]          
Cost (17) [4],[5],[10] (17) [4],[5],[10]     0 [7],[8],[12]          
Investments at fair value (17) [4],[5],[10] (17) [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 4,150 [4],[5],[9],[10] 4,150 [4],[5],[9],[10]     3,320 [7],[8],[11],[12]          
Cost 0 [4],[5],[10] 0 [4],[5],[10]     (17) [7],[8],[12]          
Investments at fair value (21) [4],[5],[10] (21) [4],[5],[10]     (17) [7],[8],[12]          
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount         15,057          
Investment, Identifier [Axis]: WEG Sub Intermediate Holdings, LLC, Subordinated                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9] 4,515 4,515                
Cost [4],[5] 4,472 4,472                
Investments at fair value [4],[5] 4,515 4,515                
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,040 [4],[5],[9],[10] 2,040 [4],[5],[9],[10]     2,040 [7],[8],[11],[12]          
Cost (6) [4],[5],[10] (6) [4],[5],[10]     (6) [7],[8],[12]          
Investments at fair value 0 [4],[5],[10] 0 [4],[5],[10]     0 [7],[8],[12]          
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         15,593          
Cost [7],[15],[16]         15,565          
Investments at fair value [7],[15],[16]         15,593          
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         11,908          
Cost [7],[8],[18]         11,887          
Investments at fair value [7],[8],[18]         11,908          
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[15],[16]         6,659          
Cost [7],[15],[16]         6,644          
Investments at fair value [7],[15],[16]         6,659          
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 4                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         1,228          
Cost [7],[8],[18]         1,221          
Investments at fair value [7],[8],[18]         1,228          
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 5                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11],[18]         824          
Cost [7],[8],[18]         819          
Investments at fair value [7],[8],[18]         824          
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subordinated                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[8],[11]         4,231          
Cost [7],[8]         4,185          
Investments at fair value [7],[8]         4,231          
Investment, Identifier [Axis]: Xactly Corporation, First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 22,500 [4],[9],[19] 22,500 [4],[9],[19]     22,500 [7],[11],[20]          
Cost 22,487 [4],[19] 22,487 [4],[19]     22,483 [7],[20]          
Investments at fair value 22,241 [4],[19] 22,241 [4],[19]     22,250 [7],[20]          
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 992 [4],[5],[9],[10] 992 [4],[5],[9],[10]     992 [7],[8],[11],[12]          
Cost (10) [4],[5],[10] (10) [4],[5],[10]     (10) [7],[8],[12]          
Investments at fair value (11) [4],[5],[10] (11) [4],[5],[10]     (11) [7],[8],[12]          
Investment, Identifier [Axis]: YLG Holding, Inc, First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[13],[14] 4,320 4,320                
Cost [4],[13],[14] 4,299 4,299                
Investments at fair value [4],[13],[14] 4,320 4,320                
Investment, Identifier [Axis]: YLG Holding, Inc, First lien - Drawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 19 19                
Cost [4],[5],[10] 18 18                
Investments at fair value [4],[5],[10] 19 19                
Investment, Identifier [Axis]: YLG Holding, Inc, First lien - Drawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 395 395                
Cost [4],[5],[10] 393 393                
Investments at fair value [4],[5],[10] 395 395                
Investment, Identifier [Axis]: YLG Holding, Inc, First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[9],[29] 21,716 21,716                
Cost [4],[29] 21,692 21,692                
Investments at fair value [4],[29] 21,716 21,716                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [7],[11],[28]         21,825          
Cost [7],[28]         21,798          
Investments at fair value [7],[28]         21,825          
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 291 291                
Cost [4],[5],[10] (1) (1)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 271 271                
Cost [4],[5],[10] (1) (1)                
Investments at fair value [4],[5],[10] 0 0                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10],[17] 301 301                
Cost [4],[5],[10],[17] 289 289                
Investments at fair value [4],[5],[10],[17] 298 298                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien - Undrawn 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,074 1,074                
Cost [4],[5],[10] (11) (11)                
Investments at fair value [4],[5],[10] (11) (11)                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien - Undrawn 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[10] 1,847 1,847                
Cost [4],[5],[10] 0 0                
Investments at fair value [4],[5],[10] (18) (18)                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 11,380 11,380                
Cost [4],[5],[17] 11,271 11,271                
Investments at fair value [4],[5],[17] 11,266 11,266                
Investment, Identifier [Axis]: eResearchTechnology, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount [4],[5],[9],[17] 1,889 1,889                
Cost [4],[5],[17] 1,876 1,876                
Investments at fair value [4],[5],[17] 1,871 1,871                
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Drawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 988 [4],[5],[9],[10] 988 [4],[5],[9],[10]     706 [7],[8],[11],[12]          
Cost 985 [4],[5],[10] 985 [4],[5],[10]     705 [7],[8],[12]          
Investments at fair value 964 [4],[5],[10] 964 [4],[5],[10]     701 [7],[8],[12]          
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 2,542 [4],[5],[9],[10] 2,542 [4],[5],[9],[10]     2,824 [7],[8],[11],[12]          
Cost (22) [4],[5],[10] (22) [4],[5],[10]     (25) [7],[8],[12]          
Investments at fair value (64) [4],[5],[10] (64) [4],[5],[10]     (21) [7],[8],[12]          
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 44,742 [4],[9],[13],[14] 44,742 [4],[9],[13],[14]     44,742 [7],[11],[15],[16]          
Cost 44,576 [4],[13],[14] 44,576 [4],[13],[14]     44,537 [7],[15],[16]          
Investments at fair value 43,623 [4],[13],[14] 43,623 [4],[13],[14]     44,406 [7],[15],[16]          
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                    
Investment Company, Nonconsolidated Subsidiary [Line Items]                    
Principal amount 7,366 [4],[9],[13],[14] 7,366 [4],[9],[13],[14]     7,366 [7],[11],[15],[16]          
Cost 7,329 [4],[13],[14] 7,329 [4],[13],[14]     7,321 [7],[15],[16]          
Investments at fair value $ 7,274 [4],[13],[14] $ 7,274 [4],[13],[14]     $ 7,311 [7],[15],[16]          
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[3] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[4] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[5] Investment is held by New Mountain Finance Corporation
[6] The Company holds ordinary shares in AAC Lender Holdings, LLC and two first lien term loans, a first lien revolver and subordinated notes in American Achievement Corporation, a partially-owned subsidiary of AAC Lender Holdings, LLC.
[7] The fair value of the Company's investment is determined using unobservable inputs that are significant to the overall fair value measurement. See Note 4. Fair Value, for details.
[8] Investment is held by New Mountain Finance Corporation
[9] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[10] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolvers or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[11] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[12] Par value amounts represent the drawn or undrawn (as indicated in type of investment) portion of revolving credit facilities or delayed draws. Cost amounts represent the cash received at settlement date net of the impact of paydowns and cash paid for drawn revolvers or delayed draws.
[13] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent, and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian.. See Note 7. Borrowings, for details.
[14] Investment is held by New Mountain Finance Holdings, L.L.C.
[15] Investment is pledged as collateral for the Holdings Credit Facility, a revolving credit facility among the Company, as the Collateral Manager, New Mountain Finance Holdings, L.L.C. as the Borrower, Wells Fargo Securities, LLC, as the Administrative Agent, and Wells Fargo Bank, National Association, as the Lender and Collateral Custodian.. See Note 7. Borrowings, for details.
[16] Investment is held by New Mountain Finance Holdings, L.L.C.
[17] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower, Sumitomo Mitsui Banking Corporation, as administrative agent, sole lead arranger, and sole book runner, and the lenders party thereto. See Note 7. Borrowings, for details.
[18] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower, Sumitomo Mitsui Banking Corporation, as administrative agent, sole lead arranger, and sole book runner, and the lenders party thereto. See Note 7. Borrowings, for details
[19] Investment is held by New Mountain Finance SBIC, L.P.
[20] Investment is held by New Mountain Finance SBIC, L.P.
[21] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, two first lien delayed draws and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of September 30, 2025, the Company's stated value of it's equity investment, plus unpaid compounded dividends, was $20,249.
[22] The Company holds investments in ACI Parent Inc. and a wholly-owned subsidiary of ACI Parent Inc. The Company holds a first lien term loan, two first lien delayed draws and a first lien revolver in ACI Group Holdings, Inc. and preferred equity in ACI Parent Inc.
[23] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of September 30, 2025, 15.1% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[24] Indicates assets that the Company deems to be “non-qualifying assets” under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70.0% of the Company’s total assets at the time of acquisition of any additional non-qualifying assets. As of December 31, 2024, 14.6% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[25] Investment is held by NMF Ancora Holdings, Inc.
[26] Investment is held by NMF Ancora Holdings, Inc.
[27] The Company holds preferred equity in Bamboo Health Intermediate Holdings, Inc.(fka Appriss Health Intermediate Holdings, Inc.) and holds a first lien term loan and a first lien revolver in Bamboo Health Holdings, LLC (fka Appriss Health, LLC), a wholly-owned subsidiary of Bamboo Health Intermediate Holdings, Inc.
[28] Investment is held by New Mountain Finance SBIC II, L.P.
[29] Investment is held by New Mountain Finance SBIC II, L.P.
[30] The Company's preferred equity investment in Dealer Tire Holdings, LLC is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of September 30, 2025, the Company's stated value of it's share, plus unpaid compounded dividends, was $84,739.
[31] The Company holds investments in two wholly-owned subsidiaries of Diamond Parent Holdings Corp. The Company holds two first lien term loans, a first lien delayed draw and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer, Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of September 30, 2025, the Company's stated value of it's equity investment, plus unpaid compounded dividends, was $15,827.
[32] The Company holds investments in two wholly-owned subsidiaries of Diamond Parent Holdings Corp. The Company holds two first lien term loans, a first lien delayed draw and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc.
[33] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of September 30, 2025 and December 31, 2024, along with transactions during the nine months ended September 30, 2025 in which the issuer was a non-controlled/affiliated investment, is as follows:
Portfolio CompanyFair Value at December 31, 2024Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at September 30, 2025Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC$19,156 $— $— $(820)$18,336 $— $994 $— $— 
Sierra Hamilton Holdings Corporation2,000 — — — 2,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC91,620 5,465 — (22,735)74,350 — 3,171 2,279 188 
Total Non-Controlled/Affiliated Investments$112,776 $5,465 $— $(23,555)$94,686 $— $4,165 $2,279 $188 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[34] Denotes investments in which the Company is an “Affiliated Person”, as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), due to owning or holding the power to vote 5.0% or more of the outstanding voting securities of the investment but not controlling the company. Fair value as of December 31, 2024 and December 31, 2023 along with transactions during the year ended December 31, 2024 in which the issuer was a non-controlled/affiliated investment is as follows:
Portfolio CompanyFair Value at December 31, 2023Gross
Additions (A)		Gross
Redemptions
(B)		Net Change In Unrealized Appreciation (Depreciation)Fair Value at December 31, 2024Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.) / Eagle Infrastructure Super HoldCo, LLC$17,873 $— $(50)$1,333 $19,156 $— $1,432 $— $— 
Sierra Hamilton Holdings Corporation2,000 — — — 2,000 — — — — 
TVG-Edmentum Holdings, LLC / Edmentum Ultimate Holdings, LLC113,786 16,409 — (38,575)91,620 — 3,659 5,843 250 
Total Non-Controlled/Affiliated Investments$133,659 $16,409 $(50)$(37,242)$112,776 $— $5,091 $5,843 $250 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, payment-in-kind (“PIK”) interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross reductions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[35] The Company holds preferred equity in Eclipse Topco, Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Eclipse Buyer, Inc., a wholly-owned subsidiary of Eclipse Topco, Inc. The Company's preferred equity investment is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of September 30, 2025, the Company's stated value of it's equity investment, plus unpaid compounded dividends, was $2,094.
[36] The Company holds preferred equity in Eclipse Topco, Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Eclipse Buyer, Inc., a wholly-owned subsidiary of Eclipse Topco, Inc.
[37] The Company holds ordinary shares and Class B-1 and Class B-2 of preferred equity in TVG-Edmentum Holdings, LLC and subordinated notes in Edmentum Ultimate Holdings, LLC, a wholly-owned subsidiary of TVG-Edmentum Holdings, LLC. As of September 30, 2025, the Company's stated value of the Company's Class B-1 and Class B-2 preferred equity investments, plus unpaid compounded dividends, was $48,080 and $29,707, respectively.
[38] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and three first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[39] The Company holds ordinary shares in FS WhiteWater Holdings, LLC, and a first lien term loan, a first lien revolver, and five first lien delayed draws in FS WhiteWater Borrower, LLC, a partially-owned subsidiary of FS WhiteWater Holdings, LLC.
[40] The Company holds an LP Interest in Firebird Co-Invest L.P. and holds a first lien term loan, a first lien delayed and a first lien revolver in Firebird Acquisition Corp, Inc., a wholly-owned subsidiary of Firebird Co-Invest L.P. .
[41] The Company's common equity investment in HBWM Holdings, LLC. is entitled to receive cumulative return that are calculated using the unreturned original investment plus any unpaid capitalized dividends. As of September 30, 2025, the Company's unreturned original investment, plus any unpaid compounded dividends, was $4,767.
[42] Investment is held by NMF HB, Inc.
[43] Investment is held by NMF HB, Inc.
[44] The Company's preferred equity investment in Knockout Intermediate Holdings I, Inc. is entitled to receive cumulative preferred dividends that are calculated using the stated value of the Company's equity investment plus the aggregate unpaid compounded dividends as of the date of determination. As of September 30, 2025, the Company's stated value of it's share, plus unpaid compounded dividends, was $12,400.
[45] The Company holds preferred equity in Knockout Intermediate Holdings I Inc. and a first lien term loan, a first lien revolver and two first lien delayed draws in Kaseya, Inc., a wholly-owned subsidiary of Knockout Intermediate Holdings I Inc.
[46] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a second lien Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp. The second lien Tranche A Term Loan is entitled to receive 20% of the interest earned on the first lien Tranche A Term Loan, which accrues interest at a rate of SOFR + 5.00%, and 20% of the interest earned on the first lien Tranche B Term Loan, which accrues interest at a rate of SOFR + 6.00%.
[47] Denotes investments in which the Company "controls", as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of September 30, 2025 and December 31, 2024, along with transactions during the nine months ended September 30, 2025 in which the issuer was a controlled investment, is as follows:
Portfolio Company (1)Fair Value at December 31, 2024Gross Additions (A)Gross Redemptions (B)Net Change In Unrealized Appreciation (Depreciation)Fair Value at September 30, 2025Net Realized Gains (Losses)Interest IncomeDividend IncomeOther Income
National HME, Inc./NHME Holdings Corp.$3,000 $— $— $— $3,000 $— $— $— $— 
New Benevis Topco, LLC / New Benevis Holdco, Inc.140,102 13,606 — (1,916)151,792 — 10,489 — 1,383 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.63,076 6,159 — (5,901)63,334 — 4,260 — 375 
NM NL Holdings, L.P.104,512 — — 1,366 105,878 — — 6,564 — 
NM GP Holdco, LLC322 — — 71 393 — — 33 — 
NM YI LLC9,960 — — (1,287)8,673 — — 674 — 
NMFC Senior Loan Program III LLC160,000 — — — 160,000 — — 17,000 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 11,521 — 
UniTek Global Services, Inc.107,524 69,314 (60,582)(46,166)70,090 38,898 516 7,781 820 
Total Controlled Investments$700,896 $89,079 $(60,582)$(53,833)$675,560 $38,898 $15,265 $43,573 $2,578 
(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[48] The Company holds ordinary shares and warrants in NHME Holdings Corp., as well as a second lien Tranche A Term Loan in National HME, Inc., a wholly-owned subsidiary of NHME Holdings Corp. The second lien Tranche A Term Loan is entitled to receive 20% of the interest earned on the first lien Tranche A Term Loan, which accrues interest at a rate of SOFR + 5.00%, and 20% of the interest earned on the first lien Tranche B Term Loan, which accrues interest at a rate of SOFR + 6.00%.
[49] Denotes investments in which the Company is in “Control”, as defined in the 1940 Act, due to owning or holding the power to vote more than 25.0% of the outstanding voting securities of the investment. Fair value as of December 31, 2024 and December 31, 2023 along with transactions during the year ended December 31, 2024 in which the issuer was a controlled investment, is as follows:
Portfolio CompanyFair Value at December 31, 2023Gross
Additions
(A)		Gross
Redemptions
(B)		Net Change In
Unrealized
Appreciation
(Depreciation)		Fair Value at December 31, 2024Net Realized Gains (Losses)Interest
Income		Dividend
Income		Other
Income
Haven Midstream LLC / Haven Midstream Holdings LLC / QID TRH Holdings LLC $3,419 $— $— $(3,419)$— $4,981 $— $— $41 
National HME, Inc./NHME Holdings Corp.3,000 — — — 3,000 — — — — 
New Benevis Topco, LLC / New Benevis Holdco, Inc.135,401 10,595 — (5,894)140,102 — 12,934 — 375 
New Permian Holdco, Inc. / New Permian Holdco, L.L.C.63,170 7,005 — (7,099)63,076 — 5,382 — 500 
NM APP CANADA CORP7 — — (7)— 31 — — — 
NM CLFX LP11,731 — (12,279)548 — (2,461)— 24 845 
NM NL Holdings, L.P.96,071 — (2,123)10,564 104,512 (548)— 8,116 181 
NM GP Holdco, LLC1,048 — (11)(715)322 (3)— 89 — 
NM YI LLC9,550 — — 410 9,960 — — 879 — 
NMFC Senior Loan Program III LLC140,000 20,000 — — 160,000 — — 23,304 — 
NMFC Senior Loan Program IV LLC112,400 — — — 112,400 — — 16,228 — 
UniTek Global Services, Inc.91,999 9,577 — 5,948 107,524 — 3,133 6,446 1,450 
Total Controlled Investments$667,796 $47,177 $(14,413)$336 $700,896 $2,000 $21,449 $55,086 $3,392 

(A)Gross additions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of discounts, reorganizations or restructurings and the movement of an existing portfolio company into this category from a different category.
(B)Gross redemptions include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, reorganizations or restructurings and the movement of an existing portfolio company out of this category into a different category.
[50] Investment is held by New Mountain Net Lease Corporation.
[51] Investment is held by New Mountain Net Lease Corporation.
[52] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of September 30, 2025, the par value U.S. dollar equivalent of the Viper Bidco, Inc. first lien term loans is $16,059 and the Nelipak Holding Company first lien term loan, undrawn delayed draw term loan, undrawn revolver and drawn revolver is $19,243, $7,522, $1,311 and $92, respectively. See Note 2. Summary of Significant Accounting Policies, for details
[53] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2024, the par value U.S. dollar equivalent of the Viper Bidco, Inc. first lien term loans is $15,057 and the Nelipak Holding Company first lien term loan, drawn revolver, undrawn delayed draw term loan and undrawn revolver is $17,109, $406 $6,638 and $833, respectively. See Note 2. Summary of Significant Accounting Policies, for details.
[54] The Company holds ordinary shares in OA Topco, L.P., and three first lien term loans and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[55] Investment is on non-accrual status as of September 30, 2025. See Note 3. Investments, for details.
[56] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $13,500 as of September 30, 2025. See Note 2. Summary of Significant Accounting Policies, for details.
[57] Investment is on non-accrual status. See Note 3. Investments, for details.
[58] The Company holds one security purchased under a collateralized agreement to resell on its Consolidated Statement of Assets and Liabilities with a cost basis of $30,000 and a fair value of $13,500 as of December 31, 2024. See Note 2. Summary of Significant Accounting Policies, for details.
[59] Investment is held by NMF Permian Holdings, LLC.
[60] Investment is held by NMF Permian Holdings, LLC.
[61] The Company holds ordinary shares in Pioneer Topco I, L.P., and two first lien term loans and a first lien revolver in Pioneer Buyer I, LLC, a wholly-owned subsidiary of Pioneer Topco I, L.P.
[62] The Company holds ordinary shares in Pioneer Topco I, L.P., and two first lien term loans and a first lien revolver in Pioneer Buyer I, LLC, a wholly-owned subsidiary of Pioneer Topco I, L.P.
[63] Investment is held by NMF Pioneer, Inc.
[64] Investment is held by NMF Pioneer, Inc.