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Investments - Narrative (Details)
€ in Thousands, £ in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
GBP (£)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
GBP (£)
Sep. 30, 2023
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
May 03, 2013
USD ($)
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   $ 3,101,924 $ 3,038,208                  
Fair value   3,091,024 3,011,322                  
Reversal of previously recorded PIK interest   (36,870) (33,594) $ (17,326)                
Investment, Identifier [Axis]: AAC Lender Holdings, LLC, Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [1],[2],[3] 0 [4],[5],[6]                  
Fair value   0 [1],[2],[3] 0 [4],[5],[6]                  
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     13,865                  
Fair value [5],[6]     13,420                  
Principal amount [5],[6],[7]     14,011                  
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     5,437                  
Fair value [5],[8]     5,263                  
Principal amount [5],[7],[8]     5,495                  
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[10]     22,772                  
Fair value [5],[9],[10]     22,965                  
Principal amount [5],[7],[9],[10]     22,965                  
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8],[9]     7,388                  
Fair value [5],[8],[9]     7,450                  
Principal amount [5],[7],[8],[9]     7,450                  
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     20,278                  
Fair value [5],[11]     20,426                  
Principal amount [5],[7],[11]     20,426                  
Investment, Identifier [Axis]: AAH Topco, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     9,628                  
Fair value [5],[8]     9,698                  
Principal amount [5],[7],[8]     9,698                  
Investment, Identifier [Axis]: AAH Topco, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (37) [2],[3],[12] (37) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   3,659 [2],[3],[12],[13] 3,659 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   22,583                    
Fair value [2],[14],[15]   22,734                    
Principal amount [2],[13],[14],[15]   22,733                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   20,104                    
Fair value [2],[3],[16]   20,218                    
Principal amount [2],[3],[13],[16]   20,218                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   9,545                    
Fair value [2],[17]   9,599                    
Principal amount [2],[13],[17]   9,599                    
Investment, Identifier [Axis]: AAH Topco, LLC, First lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   7,327                    
Fair value [2],[17]   7,375                    
Principal amount [2],[13],[17]   7,375                    
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   15,598                    
Fair value [2],[3],[16]   15,366                    
Principal amount [2],[3],[13],[16]   15,733                    
Investment, Identifier [Axis]: AAH Topco, LLC, Subordinated 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   6,117                    
Fair value [2],[17]   6,027                    
Principal amount [2],[13],[17]   6,170                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     1,384                  
Fair value [5],[6],[9]     1,364                  
Principal amount [5],[6],[7],[9]     1,397                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     350                  
Fair value [5],[6],[9]     345                  
Principal amount [5],[6],[7],[9]     353                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     21,868                  
Fair value [5],[10]     21,498                  
Principal amount [5],[7],[10]     22,025                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     3,871                  
Fair value [5],[6]     3,810                  
Principal amount [5],[6],[7]     3,904                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   233                    
Fair value [2],[3],[12]   228                    
Principal amount [2],[3],[12],[13]   235                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[18]   (21)                    
Fair value [2],[3],[12],[18]   (62)                    
Principal amount [2],[3],[12],[13],[18]   2,118                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (20)                  
Fair value [5],[6],[9]     (48)                  
Principal amount [5],[6],[7],[9]     2,001                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     0                  
Fair value [5],[6],[9]     (70)                  
Principal amount [5],[6],[7],[9]     2,909                  
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   21,782                    
Fair value [2],[14],[15]   21,266                    
Principal amount [2],[13],[14],[15]   21,910                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   4,170                    
Fair value [2],[3],[16]   4,082                    
Principal amount [2],[3],[13],[16]   4,206                    
Investment, Identifier [Axis]: ACI Group Holdings, Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   3,858                    
Fair value [2],[3],[16]   3,769                    
Principal amount [2],[3],[13],[16]   3,884                    
Investment, Identifier [Axis]: ACI Parent Inc., Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   18,444 [2],[3],[18] 16,414 [5],[6],[19]                  
Fair value   16,419 [2],[3],[18] 15,040 [5],[6],[19]                  
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   3,048                    
Fair value [2],[3],[16]   3,062                    
Principal amount [2],[3],[13],[16]   3,062                    
Investment, Identifier [Axis]: AI Altius US Bidco, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   3,077                    
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16],[20]   4,656                    
Fair value [2],[3],[16],[20]   4,698                    
Principal amount [2],[3],[13],[16],[20]   4,698                    
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,048                    
Investment, Identifier [Axis]: Adelaide Borrower, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (7)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   667                    
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     13,433                  
Fair value [5],[11]     13,444                  
Principal amount [5],[7],[11]     13,444                  
Investment, Identifier [Axis]: Alegeus Technologies Holdings Corp., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   8,406                    
Fair value [2],[3],[16]   8,404                    
Principal amount [2],[3],[13],[16]   8,510                    
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[15]   1,348                    
Fair value [2],[15]   1,348                    
Investment, Identifier [Axis]: Ambrosia Holdco Corp., Ordinary shares 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   1,300                    
Fair value [2],[3]   1,300                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     697                  
Fair value [5],[6],[9]     700                  
Principal amount [5],[6],[7],[9]     700                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     19,089                  
Fair value [5],[10]     19,159                  
Principal amount [5],[7],[10]     19,159                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     5,308                  
Fair value [5],[10]     5,331                  
Principal amount [5],[7],[10]     5,331                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (10)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,969                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (10)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     1,969                  
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   18,908                    
Fair value [2],[14],[15]   18,964                    
Principal amount [2],[13],[14],[15]   18,964                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   5,259                    
Fair value [2],[14],[15]   5,277                    
Principal amount [2],[13],[14],[15]   5,277                    
Investment, Identifier [Axis]: AmeriVet Partners Management, Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   690                    
Fair value [2],[3],[16]   693                    
Principal amount [2],[3],[13],[16]   693                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10],[21]     29,842                  
Fair value [5],[10],[21]     20,586                  
Principal amount [5],[7],[10],[21]     29,879                  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[21]     1,527                  
Fair value [5],[6],[21]     0                  
Principal amount [5],[6],[7],[21]     1,527                  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.) Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[21]     0                  
Fair value [5],[6],[21]     0                  
Principal amount [5],[6],[7],[21]     5,230                  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Principal amount   31,406                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   2,652                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [4],[5],[6],[9]     0                  
Fair value [4],[5],[6],[9]     0                  
Principal amount [4],[5],[6],[7],[9]     2,652                  
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[15],[22]   29,843                    
Fair value [2],[15],[22]   17,999                    
Principal amount [2],[13],[15],[22]   29,879                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[22]   1,527                    
Fair value [2],[3],[22]   0                    
Principal amount [2],[3],[13],[22]   1,527                    
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 basis   31,370                    
Fair value   17,999                    
Unearned interest income   5,004                    
Investment, Identifier [Axis]: American Achievement Corporation (aka AAC Holding Corp.), Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[22]   0                    
Fair value [2],[3],[22]   0                    
Principal amount [2],[3],[13],[22]   5,230                    
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]                        
Cost basis [5],[10]     10,535                  
Fair value [5],[10]     10,618                  
Principal amount [5],[7],[10]     10,618                  
Investment, Identifier [Axis]: Anaplan, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   10,548                    
Fair value [2],[3],[16]   10,618                    
Principal amount [2],[3],[13],[16]   10,618                    
Investment, Identifier [Axis]: Ancora Acquisition LLC, Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   83 [2],[23] 83 [5],[24]                  
Fair value   0 [2],[23] 0 [5],[24]                  
Investment, Identifier [Axis]: Appriss Health Intermediate Holdings, Inc., Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     2,992                  
Fair value [5],[6]     2,863                  
Investment, Identifier [Axis]: Appriss Health, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11],[25]     6,150                  
Fair value [5],[11],[25]     6,188                  
Principal amount [5],[7],[11],[25]     6,188                  
Investment, Identifier [Axis]: Appriss Health, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9],[25]     (4)                  
Fair value [5],[6],[9],[25]     0                  
Principal amount [5],[6],[7],[9],[25]     417                  
Investment, Identifier [Axis]: Associations, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     1,246                  
Fair value [5],[6],[9]     1,252                  
Principal amount [5],[6],[7],[9]     1,252                  
Investment, Identifier [Axis]: Associations, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     33,604                  
Fair value [5],[10]     33,701                  
Principal amount [5],[7],[10]     33,701                  
Investment, Identifier [Axis]: Associations, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     9,007                  
Fair value [5],[10]     9,037                  
Principal amount [5],[7],[10]     9,037                  
Investment, Identifier [Axis]: Associations, Inc. First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     9,006                  
Fair value [5],[11]     9,036                  
Principal amount [5],[7],[11]     9,036                  
Investment, Identifier [Axis]: Associations, Inc. First Lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     5,439                  
Fair value [5],[11]     5,457                  
Principal amount [5],[7],[11]     5,457                  
Investment, Identifier [Axis]: Associations, Inc. First Lien 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     4,327                  
Fair value [5],[11]     4,341                  
Principal amount [5],[7],[11]     4,341                  
Investment, Identifier [Axis]: Associations, Inc. First Lien 6                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     4,102                  
Fair value [5],[10]     4,121                  
Principal amount [5],[7],[10]     4,121                  
Investment, Identifier [Axis]: Associations, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   49,409                    
Fair value [2],[3],[16]   49,430                    
Principal amount [2],[3],[13],[16]   49,430                    
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   641                    
Fair value [2],[3],[12]   641                    
Principal amount [2],[3],[12],[13]   641                    
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (2)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   3,200                    
Investment, Identifier [Axis]: Associations, Inc., First lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   1,538                    
Fair value [2],[3],[12]   1,539                    
Principal amount [2],[3],[12],[13]   1,539                    
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (11)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     2,291                  
Investment, Identifier [Axis]: Associations, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (1)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,539                    
Investment, Identifier [Axis]: Associations, Inc., Subordinated 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   7,942                    
Fair value [2],[3]   7,959                    
Principal amount [2],[3],[13]   7,959                    
Investment, Identifier [Axis]: Associations, Inc., Subordinated 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   3,033                    
Fair value [2],[3]   3,039                    
Principal amount [2],[3],[13]   3,039                    
Investment, Identifier [Axis]: Aston FinCo S.a r.l. / Aston US Finco, LLC, Second lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   34,335 [2],[3],[16],[20] 34,301 [5],[11],[26]                  
Fair value   34,459 [2],[3],[16],[20] 34,458 [5],[11],[26]                  
Principal amount   34,459 [2],[3],[13],[16],[20] 34,459 [5],[7],[11],[26]                  
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     3,407                  
Fair value [5],[10]     3,454                  
Principal amount [5],[7],[10]     3,454                  
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [10]     1,332                  
Fair value [10]     1,332                  
Principal amount [7],[10]     1,345                  
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[20]   (5)                    
Fair value [2],[3],[12],[20]   0                    
Principal amount [2],[3],[12],[13],[20]   320                    
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9],[26]     (5)                  
Fair value [5],[6],[9],[26]     0                  
Principal amount [5],[6],[7],[9],[26]     320                  
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   3,405                    
Fair value [2],[3],[16]   3,445                    
Principal amount [2],[3],[13],[16]   3,445                    
Investment, Identifier [Axis]: Atlas AU Bidco Pty Ltd, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   1,330                    
Fair value [2],[3],[16]   1,342                    
Principal amount [2],[3],[13],[16]   1,342                    
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.) First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     21,684                  
Fair value [5],[11]     21,473                  
Principal amount [5],[7],[11]     21,847                  
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.) First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     14,664                  
Fair value [5],[10]     14,522                  
Principal amount [5],[7],[10]     14,774                  
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   21,492                    
Fair value [2],[3],[16]   21,138                    
Principal amount [2],[3],[13],[16]   21,624                    
Investment, Identifier [Axis]: Auctane Inc. (fka Stamps.com Inc.), First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   14,534                    
Fair value [2],[14],[15]   14,295                    
Principal amount [2],[13],[14],[15]   14,624                    
Investment, Identifier [Axis]: Avalara, Inc First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     17,015                  
Fair value [5],[11]     17,198                  
Principal amount [5],[7],[11]     17,198                  
Investment, Identifier [Axis]: Avalara, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   17,045                    
Fair value [2],[3],[16]   17,198                    
Principal amount [2],[3],[13],[16]   17,198                    
Investment, Identifier [Axis]: Avalara, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (21) [2],[3],[12] (21) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   1,720 [2],[3],[12],[13] 1,720 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Bach Special Limited (Bach Preference Limited), Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   13,788 [3],[16],[20] 12,189 [5],[6],[26]                  
Fair value   13,867 [3],[16],[20] 11,742 [5],[6],[26]                  
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   13,591                    
Fair value [2],[3],[16]   13,585                    
Principal amount [2],[3],[13],[16]   13,687                    
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   (15)                    
Principal amount [2],[3],[12],[13]   2,065                    
Investment, Identifier [Axis]: Baker Tilly Advisory Group, LP, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (22)                    
Fair value [2],[3],[12]   (22)                    
Principal amount [2],[3],[12],[13]   2,894                    
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16],[27]   6,081                    
Fair value [2],[3],[16],[27]   6,109                    
Principal amount [2],[3],[13],[16],[27]   6,109                    
Investment, Identifier [Axis]: Bamboo Health Holdings, LLC (f/k/a Appriss Health, LLC), First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[27]   (4)                    
Fair value [2],[3],[12],[27]   0                    
Principal amount [2],[3],[12],[13],[27]   417                    
Investment, Identifier [Axis]: Bamboo Health Intermediate Holdings (fka Appriss Health Intermediate Holdings, Inc.), Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[27]   3,432                    
Fair value [2],[3],[27]   3,371                    
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   464                    
Fair value [2],[3],[12]   467                    
Principal amount [2],[3],[12],[13]   467                    
Investment, Identifier [Axis]: Beacon Pointe Harmony, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,685                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     20,071                  
Fair value [5],[28]     20,070                  
Principal amount [5],[7],[28]     20,171                  
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[12],[29]   1,318                    
Fair value [2],[12],[29]   1,319                    
Principal amount [2],[12],[13],[29]   1,319                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   520                    
Fair value [2],[3],[12]   516                    
Principal amount [2],[3],[12],[13]   516                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3],[12] 0 [5],[9],[28]                  
Fair value   0 [2],[3],[12] 0 [5],[9],[28]                  
Principal amount   376 [2],[3],[12],[13] 2,292 [5],[7],[9],[28]                  
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (6)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,594                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien - Undrawn 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[12],[29]   (7)                    
Fair value [2],[12],[29]   0                    
Principal amount [2],[12],[13],[29]   963                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   19,931                    
Fair value [2],[29]   20,019                    
Principal amount [2],[13],[29]   20,019                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   7,827                    
Fair value [2],[14],[15]   7,827                    
Principal amount [2],[13],[14],[15]   7,827                    
Investment, Identifier [Axis]: Brave Parent Holdings, Inc.n, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (6)                  
Fair value [5],[6],[9]     (6)                  
Principal amount [5],[6],[7],[9]     1,146                  
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     16,432                  
Fair value [5],[10]     16,487                  
Principal amount [5],[7],[10]     16,487                  
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     3,401                  
Fair value [5],[10]     3,407                  
Principal amount [5],[7],[10]     3,407                  
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     760                  
Fair value [5],[10]     763                  
Principal amount [5],[7],[10]     763                  
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     341                  
Fair value [5],[10]     342                  
Principal amount [5],[7],[10]     342                  
Investment, Identifier [Axis]: Bullhorn, Inc. First Lien 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     272                  
Fair value [5],[10]     273                  
Principal amount [5],[7],[10]     273                  
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (4)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   935                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   417                    
Fair value [2],[3],[12]   417                    
Principal amount [2],[3],[12],[13]   417                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (6)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     852                  
Investment, Identifier [Axis]: Bullhorn, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,847                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   13,170                    
Fair value [2],[14],[15]   13,206                    
Principal amount [2],[13],[14],[15]   13,206                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   8,452                    
Fair value [2],[3],[16]   8,462                    
Principal amount [2],[3],[13],[16]   8,462                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   3,394                    
Fair value [2],[14],[15]   3,398                    
Principal amount [2],[13],[14],[15]   3,398                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   758                    
Fair value [2],[14],[15]   761                    
Principal amount [2],[13],[14],[15]   761                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   340                    
Fair value [2],[14],[15]   341                    
Principal amount [2],[13],[14],[15]   341                    
Investment, Identifier [Axis]: Bullhorn, Inc., First lien 6                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   271                    
Fair value [2],[14],[15]   272                    
Principal amount [2],[13],[14],[15]   272                    
Investment, Identifier [Axis]: CB Buyer, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   3,293                    
Fair value [2],[14],[15]   3,292                    
Principal amount [2],[13],[14],[15]   3,308                    
Investment, Identifier [Axis]: CB Buyer, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (2)                    
Fair value [2],[3],[12]   (2)                    
Principal amount [2],[3],[12],[13]   364                    
Investment, Identifier [Axis]: CB Buyer, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   (5)                    
Principal amount [2],[3],[12],[13]   934                    
Investment, Identifier [Axis]: CFS Management, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     11,181                  
Fair value [5],[10]     9,775                  
Principal amount [5],[7],[10]     11,188                  
Investment, Identifier [Axis]: CFS Management, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     3,330                  
Fair value [5],[10]     2,912                  
Principal amount [5],[7],[10]     3,333                  
Investment, Identifier [Axis]: CFS Management, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   11,880                    
Fair value [2],[14],[15]   10,693                    
Principal amount [2],[13],[14],[15]   11,881                    
Investment, Identifier [Axis]: CFS Management, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   3,548                    
Fair value [2],[14],[15]   3,185                    
Principal amount [2],[13],[14],[15]   3,539                    
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   8,447                    
Fair value [2],[14],[15]   8,449                    
Principal amount [2],[13],[14],[15]   8,493                    
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16]   945                    
Fair value [2],[3],[12],[16]   950                    
Principal amount [2],[3],[12],[13],[16]   954                    
Investment, Identifier [Axis]: CG Group Holdings, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (3) [2],[3],[12] (3) [5],[6],[9]                  
Fair value   (1) [2],[3],[12] (10) [5],[6],[9]                  
Principal amount   226 [2],[3],[12],[13] 226 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: CG Group Holdings, LLC,First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     8,342                  
Fair value [5],[10]     8,039                  
Principal amount [5],[7],[10]     8,403                  
Investment, Identifier [Axis]: CG Group Holdings, LLC,First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     925                  
Fair value [5],[6],[9]     894                  
Principal amount [5],[6],[7],[9]     935                  
Investment, Identifier [Axis]: CHA Holdings, Inc. Second Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     6,985                  
Fair value [5],[8]     7,012                  
Principal amount [5],[7],[8]     7,012                  
Investment, Identifier [Axis]: CHA Holdings, Inc. Second Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     4,436                  
Fair value [5],[6]     4,454                  
Principal amount [5],[6],[7]     4,453                  
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. Second Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     18,237                  
Fair value [5],[6]     18,184                  
Principal amount [5],[6],[7]     18,266                  
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc. Second Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     7,488                  
Fair value [5],[11]     7,467                  
Principal amount [5],[7],[11]     7,500                  
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   6,484                    
Fair value [2],[14],[15]   6,483                    
Principal amount [2],[13],[14],[15]   6,516                    
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16]   486                    
Fair value [2],[3],[12],[16]   486                    
Principal amount [2],[3],[12],[13],[16]   489                    
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (3)                    
Fair value [2],[3],[12]   (3)                    
Principal amount [2],[3],[12],[13]   597                    
Investment, Identifier [Axis]: CRCI Longhorn Holdings, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   (8)                    
Principal amount [2],[3],[12],[13]   1,629                    
Investment, Identifier [Axis]: Calabrio, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [28]     12,290                  
Fair value [28]     12,224                  
Principal amount [7],[28]     12,347                  
Investment, Identifier [Axis]: Calabrio, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [6],[9]     843                  
Fair value [6],[9]     841                  
Principal amount [6],[7],[9]     850                  
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (6)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   850                    
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   633                    
Fair value [2],[3],[12]   637                    
Principal amount [2],[3],[12],[13]   637                    
Investment, Identifier [Axis]: Calabrio, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [6],[9]     (5)                  
Fair value [6],[9]     (6)                  
Principal amount [6],[7],[9]     637                  
Investment, Identifier [Axis]: Calabrio, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   12,244                    
Fair value [2],[29]   12,286                    
Principal amount [2],[13],[29]   12,286                    
Investment, Identifier [Axis]: Calabrio, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   1,562                    
Fair value [2],[29]   1,574                    
Principal amount [2],[13],[29]   1,574                    
Investment, Identifier [Axis]: Cardinal Parent, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [8]     11,798                  
Fair value [8]     10,919                  
Principal amount [7],[8]     11,852                  
Investment, Identifier [Axis]: Cardinal Parent, Inc. Second Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     9,698                  
Fair value [5],[8]     8,975                  
Principal amount [5],[7],[8]     9,767                  
Investment, Identifier [Axis]: Cardinal Parent, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [17]   11,689                    
Fair value [17]   11,249                    
Principal amount [13],[17]   11,730                    
Investment, Identifier [Axis]: Cardinal Parent, Inc., Second lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   9,709                    
Fair value [2],[17]   9,423                    
Principal amount [2],[13],[17]   9,767                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   35,399                    
Fair value [2],[14],[15]   35,797                    
Principal amount [2],[13],[14],[15]   35,797                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (50)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   3,980                    
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     47,581                  
Fair value [5],[6]     45,072                  
Principal amount [5],[6],[7]     47,838                  
Investment, Identifier [Axis]: CentralSquare Technologies, LLC, Second Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     7,459                  
Fair value [5],[11]     7,066                  
Principal amount [5],[7],[11]     7,500                  
Investment, Identifier [Axis]: Ciklum Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15],[20]   9,430                    
Fair value [2],[14],[15],[20]   9,536                    
Principal amount [2],[13],[14],[15],[20]   9,536                    
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   11,955                    
Investment, Identifier [Axis]: Ciklum Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (37)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   2,989                    
Investment, Identifier [Axis]: CommerceHub, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     3,564                  
Fair value [5],[6]     3,960                  
Principal amount [5],[6],[7]     3,960                  
Investment, Identifier [Axis]: CommerceHub, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   3,608                    
Fair value [2],[3],[16]   3,920                    
Principal amount [2],[3],[13],[16]   3,920                    
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     7,037                  
Fair value [5],[10]     6,899                  
Principal amount [5],[7],[10]     7,091                  
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (4)                  
Fair value [5],[6],[9]     (11)                  
Principal amount [5],[6],[7],[9]     425                  
Investment, Identifier [Axis]: Community Brands ParentCo, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     0                  
Fair value [5],[6],[9]     (23)                  
Principal amount [5],[6],[7],[9]     849                  
Investment, Identifier [Axis]: Compsych Investments Corp., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   1,162                    
Fair value [2],[14],[15]   1,162                    
Principal amount [2],[13],[14],[15]   1,164                    
Investment, Identifier [Axis]: Compsych Investments Corp., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   (1)                    
Principal amount [2],[3],[12],[13]   333                    
Investment, Identifier [Axis]: Convey Health Solutions, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     18,928                  
Fair value [5],[8]     16,768                  
Principal amount [5],[7],[8]     19,022                  
Investment, Identifier [Axis]: Convey Health Solutions, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     3,146                  
Fair value [5],[8]     2,800                  
Principal amount [5],[7],[8]     3,176                  
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   13,101                    
Fair value [2],[3],[16]   11,935                    
Principal amount [2],[3],[13],[16]   13,152                    
Investment, Identifier [Axis]: Convey Health Solutions, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   2,180                    
Fair value [2],[3],[16]   1,993                    
Principal amount [2],[3],[13],[16]   2,196                    
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   1,045                    
Fair value [2],[3],[16]   1,050                    
Principal amount [2],[3],[13],[16]   1,050                    
Investment, Identifier [Axis]: CoreTrust Purchasing Group LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (3)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   578                    
Investment, Identifier [Axis]: Coupa Holdings, LLC First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     7,147                  
Fair value [5],[10]     7,303                  
Principal amount [5],[7],[10]     7,230                  
Investment, Identifier [Axis]: Coupa Holdings, LLC First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     7,147                  
Fair value [5],[11]     7,303                  
Principal amount [5],[7],[11]     7,230                  
Investment, Identifier [Axis]: Coupa Holdings, LLC First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     0                  
Fair value [5],[6],[9]     13                  
Principal amount [5],[6],[7],[9]     1,291                  
Investment, Identifier [Axis]: Coupa Holdings, LLC First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (12)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     989                  
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   14,243                    
Fair value [2],[3],[16]   14,388                    
Principal amount [2],[3],[13],[16]   14,388                    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,291                    
Investment, Identifier [Axis]: Coupa Holdings, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (12)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   989                    
Investment, Identifier [Axis]: Coyote Buyer, LLC First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [28]     13,625                  
Fair value [28]     13,653                  
Principal amount [7],[28]     13,653                  
Investment, Identifier [Axis]: Coyote Buyer, LLC First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [28]     2,445                  
Fair value [28]     2,457                  
Principal amount [7],[28]     2,457                  
Investment, Identifier [Axis]: Coyote Buyer, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [6],[9]     (5)                  
Fair value [6],[9]     0                  
Principal amount [6],[7],[9]     1,013                  
Investment, Identifier [Axis]: Cube Industrials Buyer, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     4,450                  
Fair value [5],[6]     4,450                  
Principal amount [5],[6],[7]     4,483                  
Investment, Identifier [Axis]: Cube Industrials Buyer, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (4)                  
Fair value [5],[6],[9]     (4)                  
Principal amount [5],[6],[7],[9]     517                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     1,815                  
Fair value [5],[10]     1,768                  
Principal amount [5],[7],[10]     1,823                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     1,007                  
Fair value [5],[6],[9]     992                  
Principal amount [5],[6],[7],[9]     1,021                  
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   1,798                    
Fair value [2],[14],[15]   1,758                    
Principal amount [2],[13],[14],[15]   1,804                    
Investment, Identifier [Axis]: DCA Investment Holding, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   1,000                    
Fair value [2],[3],[16]   987                    
Principal amount [2],[3],[13],[16]   1,011                    
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc. Second Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [6]     20,275                  
Fair value [6]     18,333                  
Principal amount [6],[7]     20,313                  
Investment, Identifier [Axis]: DG Investment Intermediate Holdings 2, Inc., Second lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [3],[16]   20,280                    
Fair value [3],[16]   20,281                    
Principal amount [3],[13],[16]   20,313                    
Investment, Identifier [Axis]: DOCS, MSO, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     18,572                  
Fair value [5],[11]     18,238                  
Principal amount [5],[7],[11]     18,572                  
Investment, Identifier [Axis]: DOCS, MSO, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     6,955                  
Fair value [5],[8]     6,830                  
Principal amount [5],[7],[8]     6,955                  
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3],[12] 0 [5],[6],[9]                  
Fair value   (13) [2],[3],[12] (43) [5],[6],[9]                  
Principal amount   2,405 [2],[3],[12],[13] 2,405 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   18,337                    
Fair value [2],[3],[16]   18,236                    
Principal amount [2],[3],[13],[16]   18,337                    
Investment, Identifier [Axis]: DOCS, MSO, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   6,867                    
Fair value [2],[17]   6,829                    
Principal amount [2],[13],[17]   6,867                    
Investment, Identifier [Axis]: DOXA Insurance Holdings LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   3,046                    
Investment, Identifier [Axis]: DS Admiral Bidco, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     7,377                  
Fair value [5],[10]     7,564                  
Principal amount [5],[7],[10]     7,472                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     65                  
Fair value [5],[6],[9]     66                  
Principal amount [5],[6],[7],[9]     66                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     65                  
Fair value [5],[6],[9]     66                  
Principal amount [5],[6],[7],[9]     66                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     12,914                  
Fair value [5],[11]     13,011                  
Principal amount [5],[7],[11]     13,011                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     1,088                  
Fair value [5],[10]     1,096                  
Principal amount [5],[7],[10]     1,096                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (10)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   986                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     0                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     459                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (9)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     920                  
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   12,799                    
Fair value [2],[3],[16]   12,878                    
Principal amount [2],[3],[13],[16]   12,878                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   1,078                    
Fair value [2],[14],[15]   1,085                    
Principal amount [2],[13],[14],[15]   1,085                    
Investment, Identifier [Axis]: Daxko Acquisition Corporation, First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   64                    
Fair value [2],[3]   65                    
Principal amount [2],[3],[13]   65                    
Investment, Identifier [Axis]: Dealer Tire Holdings, LLC, Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   75,927 [2],[3],[16] 70,383 [5],[6]                  
Fair value   79,222 [2],[3],[16] 74,768 [5],[6]                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     2,597                  
Fair value [5],[6],[9]     2,576                  
Principal amount [5],[6],[7],[9]     2,623                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     37,204                  
Fair value [5],[10]     36,791                  
Principal amount [5],[7],[10]     37,477                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     3,915                  
Fair value [5],[6]     3,873                  
Principal amount [5],[6],[7]     3,945                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16]   2,997                    
Fair value [2],[3],[12],[16]   2,987                    
Principal amount [2],[3],[12],[13],[16]   3,027                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (4)                  
Fair value [5],[6],[9]     (7)                  
Principal amount [5],[6],[7],[9]     404                  
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   36,871                    
Fair value [2],[14],[15]   36,604                    
Principal amount [2],[13],[14],[15]   37,094                    
Investment, Identifier [Axis]: Deca Dental Holdings LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   3,880                    
Fair value [2],[3],[16]   3,853                    
Principal amount [2],[3],[13],[16]   3,905                    
Investment, Identifier [Axis]: Diligent Corporation , First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9],[30]     (8)                  
Fair value [5],[6],[9],[30]     (33)                  
Principal amount [5],[6],[7],[9],[30]     1,667                  
Investment, Identifier [Axis]: Diligent Corporation, First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     1,947                  
Fair value [5],[6],[9]     1,919                  
Principal amount [5],[6],[7],[9]     1,957                  
Investment, Identifier [Axis]: Diligent Corporation, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     17,369                  
Fair value [5],[10]     16,998                  
Principal amount [5],[7],[10]     17,404                  
Investment, Identifier [Axis]: Diligent Corporation, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     5,755                  
Fair value [5],[6]     5,654                  
Principal amount [5],[6],[7]     5,768                  
Investment, Identifier [Axis]: Diligent Corporation, First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     5,667                  
Fair value [5],[10]     5,546                  
Principal amount [5],[7],[10]     5,679                  
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (8)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   2,265                    
Investment, Identifier [Axis]: Diligent Corporation, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (13)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   3,398                    
Investment, Identifier [Axis]: Diligent Corporation, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   19,753                    
Fair value [2],[14],[15]   19,821                    
Principal amount [2],[13],[14],[15]   19,821                    
Investment, Identifier [Axis]: Diligent Corporation, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   3,386                    
Fair value [2],[3],[16]   3,398                    
Principal amount [2],[3],[13],[16]   3,398                    
Investment, Identifier [Axis]: Diligent Preferred Issuer, Inc., Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   14,162 [2],[3],[31] 12,771 [5],[6],[30]                  
Fair value   13,609 [2],[3],[31] 12,162 [5],[6],[30]                  
Investment, Identifier [Axis]: EAB Global, Inc. Second Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     14,695                  
Fair value [5],[10]     14,868                  
Principal amount [5],[7],[10]     14,868                  
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   10,628 [2],[14],[15] 10,676 [5],[10]                  
Fair value   10,628 [2],[14],[15] 10,676 [5],[10]                  
Principal amount   10,628 [2],[13],[14],[15] 10,676 [5],[7],[10]                  
Investment, Identifier [Axis]: Eagle Infrastructure Services, LLC (fka FR Arsenal Holdings II Corp.), First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   340 [2],[3] 342 [5],[6]                  
Fair value   340 [2],[3] 342 [5],[6]                  
Principal amount   340 [2],[3],[13] 342 [5],[6],[7]                  
Investment, Identifier [Axis]: Eagle Infrastructure Super HoldCo, LLC, Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   4,104 [2],[3] 4,102 [5],[6]                  
Fair value   8,188 [2],[3] 6,855 [5],[6]                  
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17],[32]   7,078                    
Fair value [2],[17],[32]   7,078                    
Principal amount [2],[13],[17],[32]   7,113                    
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[12],[17]   0                    
Fair value [2],[12],[17]   (6)                    
Principal amount [2],[12],[13],[17]   1,206                    
Investment, Identifier [Axis]: Eclipse Buyer Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (21)                    
Fair value [2],[3],[12]   (21)                    
Principal amount [2],[3],[12],[13]   4,190                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   145                    
Fair value [2],[3]   305                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Preferred shares 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   2,900                    
Fair value [2],[3]   2,900                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc. (fka Transcendia Holdings, Inc.), Preferred shares 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[22]   2,565                    
Fair value [2],[3],[22]   2,702                    
Investment, Identifier [Axis]: Eclipse Topco Holdings, Inc., Junior preferred shares, Non-accrual status                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   2,565                    
Fair value   2,702                    
Unearned interest income   256                    
Investment, Identifier [Axis]: Eclipse Topco, Inc., Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17],[32]   1,952                    
Fair value [2],[17],[32]   1,952                    
Investment, Identifier [Axis]: Edmentum Ultimate Holdings, LLC, Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   22,223 [2],[3] 18,544 [5],[6]                  
Fair value   22,290 [2],[3] 18,635 [5],[6]                  
Principal amount   22,290 [2],[3],[13] 18,635 [5],[6],[7]                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     4,462                  
Fair value [5],[6],[9]     4,466                  
Principal amount [5],[6],[7],[9]     4,503                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     312                  
Fair value [5],[6],[9]     310                  
Principal amount [5],[6],[7],[9]     315                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     10,217                  
Fair value [5],[28]     10,125                  
Principal amount [5],[7],[28]     10,290                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     3,427                  
Fair value [5],[28]     3,398                  
Principal amount [5],[7],[28]     3,454                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     3,407                  
Fair value [5],[28]     3,378                  
Principal amount [5],[7],[28]     3,432                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[33]   (14)                    
Fair value [2],[3],[12],[33]   0                    
Principal amount [2],[3],[12],[13],[33]   1,400                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     0                  
Fair value [5],[6],[9]     (10)                  
Principal amount [5],[6],[7],[9]     1,229                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (11)                  
Fair value [5],[6],[9]     (17)                  
Principal amount [5],[6],[7],[9]     1,085                  
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   10,127                    
Fair value [2],[29]   10,185                    
Principal amount [2],[13],[29]   10,185                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   5,636                    
Fair value [2],[3],[16]   5,677                    
Principal amount [2],[3],[13],[16]   5,677                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   3,398                    
Fair value [2],[29]   3,419                    
Principal amount [2],[13],[29]   3,419                    
Investment, Identifier [Axis]: FS WhiteWater Borrower, LLC, First lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   3,378                    
Fair value [2],[29]   3,397                    
Principal amount [2],[13],[29]   3,397                    
Investment, Identifier [Axis]: FS WhiteWater Holdings, LLC, Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   5,000 [2],[29],[33] 5,000 [5],[28],[34]                  
Fair value   4,618 [2],[29],[33] 4,454 [5],[28],[34]                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     996                  
Fair value [5],[6],[9]     1,006                  
Principal amount [5],[6],[7],[9]     1,006                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     33,444                  
Fair value [5],[10]     33,698                  
Principal amount [5],[7],[10]     33,698                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     344                  
Fair value [5],[6]     347                  
Principal amount [5],[6],[7]     347                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3],[12] 0 [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   3,312 [2],[3],[12],[13] 4,557 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (21) [2],[3],[12] (11) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   2,095 [2],[3],[12],[13] 1,090 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   33,163                    
Fair value [2],[14],[15]   33,356                    
Principal amount [2],[13],[14],[15]   33,356                    
Investment, Identifier [Axis]: Foreside Financial Group, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   4,041                    
Fair value [2],[3],[16]   4,075                    
Principal amount [2],[3],[13],[16]   4,075                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     142                  
Fair value [5],[6],[9]     142                  
Principal amount [5],[6],[7],[9]     143                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     137                  
Fair value [5],[6],[9]     138                  
Principal amount [5],[6],[7],[9]     138                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     17,219                  
Fair value [5],[10]     17,243                  
Principal amount [5],[7],[10]     17,353                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     10,017                  
Fair value [5],[11]     10,028                  
Principal amount [5],[7],[11]     10,092                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     1,168                  
Fair value [5],[6]     1,171                  
Principal amount [5],[6],[7]     1,178                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First Lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     80                  
Fair value [5],[6]     80                  
Principal amount [5],[6],[7]     80                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   990                    
Fair value [2],[3],[12]   1,001                    
Principal amount [2],[3],[12],[13]   1,001                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   343                    
Fair value [2],[3],[12]   342                    
Principal amount [2],[3],[12],[13]   342                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3],[12] (27) [5],[6],[9]                  
Fair value   0 [2],[3],[12] (17) [5],[6],[9]                  
Principal amount   3,360 [2],[3],[12],[13] 2,718 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (19) [2],[3],[12] 0 [5],[6],[9]                  
Fair value   0 [2],[3],[12] (28) [5],[6],[9]                  
Principal amount   1,859 [2],[3],[12],[13] 4,435 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   17,066                    
Fair value [2],[14],[15]   17,176                    
Principal amount [2],[13],[14],[15]   17,176                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   11,946                    
Fair value [2],[3],[16]   12,020                    
Principal amount [2],[3],[13],[16]   12,020                    
Investment, Identifier [Axis]: Fortis Solutions Group, LLC, First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   79                    
Fair value [2],[3]   80                    
Principal amount [2],[3],[13]   80                    
Investment, Identifier [Axis]: Foundational Education Group, Inc. Second Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     22,412                  
Fair value [5],[28]     22,100                  
Principal amount [5],[7],[28]     22,500                  
Investment, Identifier [Axis]: Foundational Education Group, Inc. Second Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     6,989                  
Fair value [5],[10]     6,884                  
Principal amount [5],[7],[10]     7,009                  
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   22,423                    
Fair value [2],[29]   22,500                    
Principal amount [2],[13],[29]   22,500                    
Investment, Identifier [Axis]: Foundational Education Group, Inc., Second lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   6,992                    
Fair value [2],[14],[15]   7,009                    
Principal amount [2],[13],[14],[15]   7,009                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[10]     446                  
Fair value [5],[9],[10]     451                  
Principal amount [5],[7],[9],[10]     451                  
Investment, Identifier [Axis]: GC Waves Holdings, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     40,008                  
Fair value [5],[10]     40,270                  
Principal amount [5],[7],[10]     40,270                  
Investment, Identifier [Axis]: GC Waves Holdings, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     21,591                  
Fair value [5],[28]     21,666                  
Principal amount [5],[7],[28]     21,666                  
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (30) [2],[3],[12] (30) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   3,951 [2],[3],[12],[13] 3,951 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   40,084                    
Fair value [2],[14],[15]   40,312                    
Principal amount [2],[13],[14],[15]   40,312                    
Investment, Identifier [Axis]: GC Waves Holdings, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   21,386                    
Fair value [2],[29]   21,448                    
Principal amount [2],[13],[29]   21,448                    
Investment, Identifier [Axis]: GEDC Equity, LLC, Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     190                  
Fair value [5],[6]     150                  
Investment, Identifier [Axis]: GEDC Equity, LLC, Participation Interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   190                    
Fair value [2],[3]   50                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     33,947                  
Fair value [5],[10]     34,023                  
Principal amount [5],[7],[10]     34,023                  
Investment, Identifier [Axis]: GS Acquisitionco, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     21,476                  
Fair value [5],[28]     21,521                  
Principal amount [5],[7],[28]     21,521                  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   319                    
Fair value [2],[3],[12]   319                    
Principal amount [2],[3],[12],[13]   319                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (23)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     3,730                  
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,120                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (26)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   4,821                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   34,663                    
Fair value [2],[14],[15]   34,719                    
Principal amount [2],[13],[14],[15]   34,719                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   21,263                    
Fair value [2],[29]   21,297                    
Principal amount [2],[13],[29]   21,297                    
Investment, Identifier [Axis]: GS Acquisitionco, Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   2,902                    
Fair value [2],[3],[16]   2,909                    
Principal amount [2],[3],[13],[16]   2,909                    
Investment, Identifier [Axis]: Galway Borrower LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   1,779                    
Fair value [2],[3],[12]   1,788                    
Principal amount [2],[3],[12],[13]   1,806                    
Investment, Identifier [Axis]: Galway Borrower LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   1,083                    
Fair value [2],[14],[15]   1,080                    
Principal amount [2],[13],[14],[15]   1,090                    
Investment, Identifier [Axis]: Granicus, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     575                  
Fair value [5],[6],[9]     579                  
Principal amount [5],[6],[7],[9]     579                  
Investment, Identifier [Axis]: Granicus, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     15,396                  
Fair value [5],[8]     15,463                  
Principal amount [5],[7],[8]     15,463                  
Investment, Identifier [Axis]: Granicus, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     5,954                  
Fair value [5],[11]     5,981                  
Principal amount [5],[7],[11]     5,981                  
Investment, Identifier [Axis]: Granicus, Inc. First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     5,874                  
Fair value [5],[10]     5,899                  
Principal amount [5],[7],[10]     5,899                  
Investment, Identifier [Axis]: Granicus, Inc. First Lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     4,511                  
Fair value [5],[10]     4,542                  
Principal amount [5],[7],[10]     4,542                  
Investment, Identifier [Axis]: Granicus, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (14)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     1,834                  
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   17,858                    
Fair value [2],[14],[15]   17,856                    
Principal amount [2],[13],[14],[15]   17,901                    
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   445                    
Fair value [2],[3],[12]   446                    
Principal amount [2],[3],[12],[13]   448                    
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (4)                    
Fair value [2],[3],[12]   (4)                    
Principal amount [2],[3],[12],[13]   1,682                    
Investment, Identifier [Axis]: GraphPAD Software, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (10)                    
Fair value [2],[3],[12]   (10)                    
Principal amount [2],[3],[12],[13]   4,038                    
Investment, Identifier [Axis]: Greenway Health, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [11]     6,254                  
Fair value [11]     6,254                  
Principal amount [7],[11]     6,349                  
Investment, Identifier [Axis]: Greenway Health, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   6,221                    
Fair value [2],[3],[16]   6,302                    
Principal amount [2],[3],[13],[16]   6,302                    
Investment, Identifier [Axis]: Groundworks, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     19,245                  
Fair value [5],[8]     19,330                  
Principal amount [5],[7],[8]     19,517                  
Investment, Identifier [Axis]: Groundworks, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [17]   18,734                    
Fair value [17]   19,034                    
Principal amount [13],[17]   18,908                    
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [12],[17]   552                    
Fair value [12],[17]   560                    
Principal amount [12],[13],[17]   557                    
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [12],[17]   (15)                    
Fair value [12],[17]   20                    
Principal amount [12],[13],[17]   2,938                    
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8],[9]     0                  
Fair value [5],[8],[9]     (9)                  
Principal amount [5],[7],[8],[9]     891                  
Investment, Identifier [Axis]: Groundworks, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (16)                  
Fair value [5],[6],[9]     (10)                  
Principal amount [5],[6],[7],[9]     1,076                  
Investment, Identifier [Axis]: HB Wealth Management, LLC, Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[35]     4,777                  
Fair value [5],[35]     5,125                  
Investment, Identifier [Axis]: HBWM Holdings, LLC, Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[36]   4,717                    
Fair value [2],[36]   9,532                    
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc. Second Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     22,429                  
Fair value [5],[28]     21,059                  
Principal amount [5],[7],[28]     22,500                  
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc. Second Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     4,184                  
Fair value [5],[10]     3,938                  
Principal amount [5],[7],[10]     4,208                  
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [29]   22,441                    
Fair value [29]   14,513                    
Principal amount [13],[29]   22,500                    
Investment, Identifier [Axis]: HS Purchaser, LLC / Help/Systems Holdings, Inc., Second lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [14],[15]   4,188                    
Fair value [14],[15]   2,714                    
Principal amount [13],[14],[15]   4,208                    
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[37]     0                  
Fair value [5],[37]     3,323                  
Investment, Identifier [Axis]: Haven Midstream Holdings LLC, Profit Interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[38]     0                  
Fair value [5],[38]     96                  
Investment, Identifier [Axis]: Haven Midstream LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     0                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     8,000                  
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     5,070                  
Fair value [5],[11]     5,069                  
Principal amount [5],[7],[11]     5,120                  
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   5,025                    
Fair value [2],[3],[16]   5,069                    
Principal amount [2],[3],[13],[16]   5,069                    
Investment, Identifier [Axis]: Healthspan Buyer, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (12) [2],[3],[12] (12) [5],[6],[9]                  
Fair value   0 [2],[3],[12] (12) [5],[6],[9]                  
Principal amount   1,229 [2],[3],[12],[13] 1,229 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   3,808                    
Fair value [2],[3],[16]   3,808                    
Principal amount [2],[3],[13],[16]   3,808                    
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   2,302                    
Fair value [2],[3],[12]   2,313                    
Principal amount [2],[3],[12],[13]   2,313                    
Investment, Identifier [Axis]: Higginbotham Insurance Agency, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   5,676                    
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [11]     6,430                  
Fair value [11]     6,704                  
Principal amount [7],[11]     6,822                  
Investment, Identifier [Axis]: Houghton Mifflin Harcourt Company, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [3],[16]   14,108                    
Fair value [3],[16]   14,291                    
Principal amount [3],[13],[16]   14,484                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     28,625                  
Fair value [5],[10]     28,839                  
Principal amount [5],[7],[10]     28,839                  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     4,197                  
Fair value [5],[10]     4,214                  
Principal amount [5],[7],[10]     4,214                  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (38) [2],[3],[12] (23) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   3,780 [2],[3],[12],[13] 2,298 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   32,611                    
Fair value [2],[14],[15]   32,799                    
Principal amount [2],[13],[14],[15]   32,799                    
Investment, Identifier [Axis]: IG Investments Holdings, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   2,540                    
Fair value [2],[3],[16]   2,542                    
Principal amount [2],[3],[13],[16]   2,542                    
Investment, Identifier [Axis]: IMO Investor Holdings, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     12,739                  
Fair value [5],[10]     12,742                  
Principal amount [5],[7],[10]     12,844                  
Investment, Identifier [Axis]: IMO Investor Holdings, Inc. First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     1,128                  
Fair value [5],[6],[9]     1,130                  
Principal amount [5],[6],[7],[9]     1,139                  
Investment, Identifier [Axis]: IMO Investor Holdings, Inc. First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     61                  
Fair value [5],[6],[9]     61                  
Principal amount [5],[6],[7],[9]     62                  
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (15)                  
Fair value [5],[6],[9]     (12)                  
Principal amount [5],[6],[7],[9]     1,487                  
Investment, Identifier [Axis]: IMO Investor Holdings, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     0                  
Fair value [5],[6],[9]     (16)                  
Principal amount [5],[6],[7],[9]     1,951                  
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   8,619                    
Fair value [2],[3],[16]   8,696                    
Principal amount [2],[3],[13],[16]   8,696                    
Investment, Identifier [Axis]: Icefall Parent, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (8)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   828                    
Investment, Identifier [Axis]: Idera, Inc. Secnd Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     22,273                  
Fair value [5],[8]     22,500                  
Principal amount [5],[7],[8]     22,500                  
Investment, Identifier [Axis]: Idera, Inc. Secnd Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     2,989                  
Fair value [5],[6]     3,000                  
Principal amount [5],[6],[7]     3,000                  
Investment, Identifier [Axis]: Idera, Inc., Second lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   14,961                    
Fair value [2],[17]   15,091                    
Principal amount [2],[13],[17]   15,091                    
Investment, Identifier [Axis]: Idera, Inc., Second lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   2,006                    
Fair value [2],[3],[16]   2,012                    
Principal amount [2],[3],[13],[16]   2,012                    
Investment, Identifier [Axis]: Infogain Corporation, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     18,605                  
Fair value [5],[10]     18,707                  
Principal amount [5],[7],[10]     18,707                  
Investment, Identifier [Axis]: Infogain Corporation, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     7,781                  
Fair value [5],[11]     7,844                  
Principal amount [5],[7],[11]     7,844                  
Investment, Identifier [Axis]: Infogain Corporation, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (29) [2],[3],[12] (29) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   3,827 [2],[3],[12],[13] 3,827 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Infogain Corporation, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   18,291                    
Fair value [2],[14],[15]   18,372                    
Principal amount [2],[13],[14],[15]   18,372                    
Investment, Identifier [Axis]: Infogain Corporation, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   7,713                    
Fair value [2],[3],[16]   7,764                    
Principal amount [2],[3],[13],[16]   7,764                    
Investment, Identifier [Axis]: Infogain Corporation, Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   16,795 [2],[3] 17,060 [5],[6]                  
Fair value   16,953 [2],[3] 17,245 [5],[6]                  
Principal amount   16,953 [2],[3],[13] 17,245 [5],[6],[7]                  
Investment, Identifier [Axis]: Integro Parent Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     4,085                  
Fair value [5],[10]     4,086                  
Principal amount [5],[7],[10]     4,086                  
Investment, Identifier [Axis]: Integro Parent Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     805                  
Fair value [5],[6]     807                  
Principal amount [5],[6],[7]     807                  
Investment, Identifier [Axis]: Integro Parent Inc., Second lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   6,405 [2],[3],[16],[20] 12,888 [5],[6]                  
Fair value   6,331 [2],[3],[16],[20] 13,231 [5],[6]                  
Principal amount   7,091 [2],[3],[13],[16],[20] 13,657 [5],[6],[7]                  
Investment, Identifier [Axis]: Ivy Hill Middle Market Credit Fund, Ltd, Structured Finance Obligations                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [3],[20]   3,232                    
Fair value [3],[20]   3,232                    
Investment, Identifier [Axis]: KAMC Holdings, Inc, Second Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     18,673                  
Fair value [5],[10]     17,079                  
Principal amount [5],[7],[10]     18,750                  
Investment, Identifier [Axis]: KAMC Holdings, Inc, Second Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     18,673                  
Fair value [5],[11]     17,079                  
Principal amount [5],[7],[11]     18,750                  
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[10]     1,150                  
Fair value [5],[9],[10]     1,138                  
Principal amount [5],[7],[9],[10]     1,160                  
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     19                  
Fair value [5],[6],[9]     19                  
Principal amount [5],[6],[7],[9]     19                  
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     6,846                  
Fair value [5],[11]     6,763                  
Principal amount [5],[7],[11]     6,898                  
Investment, Identifier [Axis]: KPSKY Acquisition Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     784                  
Fair value [5],[10]     774                  
Principal amount [5],[7],[10]     790                  
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   19                    
Fair value [2],[3],[12]   18                    
Principal amount [2],[3],[12],[13]   19                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3],[12] 0 [5],[6],[9]                  
Fair value   (47) [2],[3],[12] (16) [5],[6],[9]                  
Principal amount   1,568 [2],[3],[12],[13] 1,568 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   6,785                    
Fair value [2],[3],[16]   6,570                    
Principal amount [2],[3],[13],[16]   6,827                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   1,140                    
Fair value [2],[3],[16]   1,106                    
Principal amount [2],[3],[13],[16]   1,149                    
Investment, Identifier [Axis]: KPSKY Acquisition Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   777                    
Fair value [2],[3],[16]   752                    
Principal amount [2],[3],[13],[16]   782                    
Investment, Identifier [Axis]: Kaseya Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     63,237                  
Fair value [5],[10]     63,633                  
Principal amount [5],[7],[10]     63,633                  
Investment, Identifier [Axis]: Kaseya Inc. First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     966                  
Fair value [5],[6],[9]     973                  
Principal amount [5],[6],[7],[9]     973                  
Investment, Identifier [Axis]: Kaseya Inc. First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     235                  
Fair value [5],[6],[9]     237                  
Principal amount [5],[6],[7],[9]     237                  
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16]   966                    
Fair value [2],[3],[12],[16]   973                    
Principal amount [2],[3],[12],[13],[16]   973                    
Investment, Identifier [Axis]: Kaseya Inc., First lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   746                    
Fair value [2],[3],[12]   751                    
Principal amount [2],[3],[12],[13]   751                    
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3],[12] 0 [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   2,865 [2],[3],[12],[13] 3,616 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Kaseya Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (22) [2],[3],[12] (22) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   2,888 [2],[3],[12],[13] 2,888 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Kaseya Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   63,786                    
Fair value [2],[14],[15]   64,124                    
Principal amount [2],[13],[14],[15]   64,124                    
Investment, Identifier [Axis]: Kaseya Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   237                    
Fair value [2],[3],[16]   238                    
Principal amount [2],[3],[13],[16]   238                    
Investment, Identifier [Axis]: Kele Holdco, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     14,767                  
Fair value [5],[28]     14,796                  
Principal amount [5],[7],[28]     14,796                  
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (9)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     1,799                  
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (9)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,799                    
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   14,617                    
Fair value [2],[29]   14,635                    
Principal amount [2],[13],[29]   14,635                    
Investment, Identifier [Axis]: Kele Holdco, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   2,254                    
Fair value [2],[29]   2,268                    
Principal amount [2],[13],[29]   2,268                    
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   3,477                    
Fair value [2],[14],[15]   3,509                    
Principal amount [2],[13],[14],[15]   3,509                    
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   161                    
Fair value [2],[3],[12]   162                    
Principal amount [2],[3],[12],[13]   162                    
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,398                    
Investment, Identifier [Axis]: Kene Acquisition, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (5)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   468                    
Investment, Identifier [Axis]: Knockout Intermediate Holdings I Inc., Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   20,819 [2],[3],[39] 16,837 [5],[6],[40]                  
Fair value   21,010 [2],[3],[39] 17,019 [5],[6],[40]                  
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   6,065                    
Fair value [2],[29]   6,062                    
Principal amount [2],[13],[29]   6,124                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   71                    
Fair value [2],[3],[12]   71                    
Principal amount [2],[3],[12],[13]   72                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[12],[29]   0                    
Fair value [2],[12],[29]   (4)                    
Principal amount [2],[12],[13],[29]   358                    
Investment, Identifier [Axis]: Legends Hospitality Holding Company, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (6)                    
Fair value [2],[3],[12]   (6)                    
Principal amount [2],[3],[12],[13]   644                    
Investment, Identifier [Axis]: Logrhythm, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   4,138                    
Fair value [2],[3],[16]   4,196                    
Principal amount [2],[3],[13],[16]   4,196                    
Investment, Identifier [Axis]: Logrhythm, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (6)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   420                    
Investment, Identifier [Axis]: MED Parentco, LP, Second Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     20,769                  
Fair value [5],[11]     20,119                  
Principal amount [5],[7],[11]     20,857                  
Investment, Identifier [Axis]: MRI Software LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     21,610                  
Fair value [5],[28]     21,598                  
Principal amount [5],[7],[28]     21,655                  
Investment, Identifier [Axis]: MRI Software LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     7,655                  
Fair value [5],[6]     7,650                  
Principal amount [5],[6],[7]     7,670                  
Investment, Identifier [Axis]: MRI Software LLC, First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     4,561                  
Fair value [5],[10]     4,557                  
Principal amount [5],[7],[10]     4,568                  
Investment, Identifier [Axis]: MRI Software LLC, First Lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     3,133                  
Fair value [5],[10]     3,132                  
Principal amount [5],[7],[10]     3,140                  
Investment, Identifier [Axis]: MRI Software LLC, First Lien 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     799                  
Fair value [5],[10]     800                  
Principal amount [5],[7],[10]     801                  
Investment, Identifier [Axis]: MRI Software LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   111                    
Fair value [2],[3],[12]   111                    
Principal amount [2],[3],[12],[13]   111                    
Investment, Identifier [Axis]: MRI Software LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (9) [2],[3],[12] (10) [5],[6],[9]                  
Fair value   0 [2],[3],[12] (5) [5],[6],[9]                  
Principal amount   1,891 [2],[3],[12],[13] 2,002 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: MRI Software LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   21,398                    
Fair value [2],[29]   21,430                    
Principal amount [2],[13],[29]   21,430                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   7,580                    
Fair value [2],[3],[16]   7,591                    
Principal amount [2],[3],[13],[16]   7,591                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   4,516                    
Fair value [2],[14],[15]   4,521                    
Principal amount [2],[13],[14],[15]   4,521                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   3,103                    
Fair value [2],[14],[15]   3,107                    
Principal amount [2],[13],[14],[15]   3,107                    
Investment, Identifier [Axis]: MRI Software LLC, First lien 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   792                    
Fair value [2],[3],[16]   793                    
Principal amount [2],[3],[13],[16]   793                    
Investment, Identifier [Axis]: Michael Baker International, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [3],[16]   4,869                    
Fair value [3],[16]   4,910                    
Principal amount [3],[13],[16]   4,892                    
Investment, Identifier [Axis]: Model N, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   44,008                    
Fair value [2],[14],[15]   43,997                    
Principal amount [2],[13],[14],[15]   44,218                    
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (24)                    
Fair value [2],[3],[12]   (24)                    
Principal amount [2],[3],[12],[13]   4,825                    
Investment, Identifier [Axis]: Model N, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   (45)                    
Principal amount [2],[3],[12],[13]   9,047                    
Investment, Identifier [Axis]: NC Topco, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   5,825                    
Fair value [2],[14],[15]   5,824                    
Principal amount [2],[13],[14],[15]   5,853                    
Investment, Identifier [Axis]: NC Topco, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (3)                    
Fair value [2],[3],[12]   (3)                    
Principal amount [2],[3],[12],[13]   669                    
Investment, Identifier [Axis]: NC Topco, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   (8)                    
Principal amount [2],[3],[12],[13]   1,672                    
Investment, Identifier [Axis]: NHME Holdings Corp., Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   4,000 [2],[3],[41] 4,000 [5],[6],[42]                  
Fair value   0 [2],[3],[41] 0 [5],[6],[42]                  
Investment, Identifier [Axis]: NHME Holdings Corp., Warrants                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   1,000 [2],[3],[41] 1,000 [5],[6],[42]                  
Fair value   0 [2],[3],[41] 0 [5],[6],[42]                  
Investment, Identifier [Axis]: NM APP Canada Corp., Membership interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[26],[43]     0                  
Fair value [5],[26],[43]     7                  
Investment, Identifier [Axis]: NM CLFX LP, Membership interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[43]     12,278                  
Fair value [5],[43]     11,731                  
Investment, Identifier [Axis]: NM GP Holdco, LLC, Membership interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   850 [2],[20],[44] 861 [5],[26],[43]                  
Fair value   322 [2],[20],[44] 1,048 [5],[26],[43]                  
Investment, Identifier [Axis]: NM NL Holdings, L.P., Membership interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   74,248 [2],[20],[44] 76,371 [5],[26],[43]                  
Fair value   104,512 [2],[20],[44] 96,071 [5],[26],[43]                  
Investment, Identifier [Axis]: NM YI, LLC, Membership interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   6,272 [2],[44] 6,272 [5],[43]                  
Fair value   9,960 [2],[44] 9,550 [5],[43]                  
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     4,992                  
Fair value [5],[6],[9]     4,979                  
Principal amount [5],[6],[7],[9]     5,012                  
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis     19,067                  
Fair value     19,133                  
Principal amount [7]     19,259                  
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     4,864                  
Fair value [5],[10]     4,881                  
Principal amount [5],[7],[10]     4,913                  
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   19,106                    
Fair value   19,259                    
Principal amount [13]   19,259                    
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   4,996                    
Fair value [2],[3],[16]   5,012                    
Principal amount [2],[3],[13],[16]   5,012                    
Investment, Identifier [Axis]: NMC Crimson Holdings, Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   4,874                    
Fair value [2],[3],[16]   4,913                    
Principal amount [2],[3],[13],[16]   4,913                    
Investment, Identifier [Axis]: NMFC Senior Loan Program III LLC, Membership interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   160,000 [2],[3],[20] 140,000 [5],[6],[26]                  
Fair value   160,000 [2],[3],[20] 140,000 [5],[6],[26]                  
Investment, Identifier [Axis]: NMFC Senior Loan Program IV LLC, Membership interest                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   112,400 [2],[3],[20] 112,400 [5],[6],[26]                  
Fair value   112,400 [2],[3],[20] 112,400 [5],[6],[26]                  
Investment, Identifier [Axis]: National HME, Inc., Second lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   7,871 [2],[3],[41] 7,872 [5],[6],[21],[42]                  
Fair value   3,000 [2],[3],[41] 3,000 [5],[6],[21],[42]                  
Unearned interest income   2,058                    
Reversal of previously recorded PIK interest $ 11,236                      
Reversal of previously recorded other income $ 1,500                      
Principal amount   8,281 [2],[3],[13],[41] 8,281 [5],[6],[7],[21],[42]                  
Investment, Identifier [Axis]: Ncontracts, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [10]     8,268                  
Fair value [10]     8,267                  
Principal amount [7],[10]     8,372                  
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [6],[9]     0                  
Fair value [6],[9]     0                  
Principal amount [6],[7],[9]     773                  
Investment, Identifier [Axis]: Ncontracts, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [6],[9]     (10)                  
Fair value [6],[9]     (10)                  
Principal amount [6],[7],[9]     773                  
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, First lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16],[45]   1,089                    
Fair value [2],[3],[12],[16],[45]   1,097                    
Principal amount [2],[3],[12],[13],[16],[45]   1,097                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   406                    
Fair value [2],[3],[12]   405                    
Principal amount [2],[3],[12],[13]   392                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   3,501                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16],[45]   0                    
Fair value [2],[3],[12],[16],[45]   0                    
Principal amount [2],[3],[12],[13],[16],[45]   6,411                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16],[45]   (6)                    
Fair value [2],[3],[12],[16],[45]   0                    
Principal amount [2],[3],[12],[13],[16],[45]   804                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien - Undrawn 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (11)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,515                    
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16],[45]   17,776                    
Fair value [2],[3],[16],[45]   17,108                    
Principal amount | € [2],[3],[13],[16],[45]         € 16,523              
Investment, Identifier [Axis]: Nelipak Holding Company, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   8,961                    
Fair value [2],[14],[15]   9,023                    
Principal amount [2],[13],[14],[15]   9,023                    
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   46,068 [2],[15] 41,731 [5],[10]                  
Fair value   46,068 [2],[15] 41,731 [5],[10]                  
Principal amount   46,068 [2],[13],[15] 41,731 [5],[7],[10]                  
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   33,155 [2],[3],[16] 19,798 [5],[6]                  
Fair value   33,155 [2],[3],[16] 19,798 [5],[6]                  
Principal amount   33,155 [2],[3],[13],[16] 19,798 [5],[6],[7]                  
Investment, Identifier [Axis]: New Benevis Holdco, Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     10,239                  
Fair value [5],[11]     10,239                  
Principal amount [5],[7],[11]     10,239                  
Investment, Identifier [Axis]: New Benevis Holdco, Inc., Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   22,942 [2],[3] 19,801 [5],[6]                  
Fair value   19,051 [2],[3] 16,874 [5],[6]                  
Principal amount   23,814 [2],[3],[13] 21,092 [5],[6],[7]                  
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   27,154 [2],[15] 27,154 [5],[10]                  
Fair value   28,481 [2],[15] 31,838 [5],[10]                  
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   12,768 [2],[3] 6,662 [5],[11]                  
Fair value   13,347 [2],[3] 7,812 [5],[11]                  
Investment, Identifier [Axis]: New Benevis Topco, LLC, Ordinary shares 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     6,108                  
Fair value [5],[6]     7,109                  
Investment, Identifier [Axis]: New Permian Holdco, Inc., Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   11,155 [2],[3] 11,155 [5],[6]                  
Fair value   18,900 [2],[3] 26,000 [5],[6]                  
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   23,336 [2],[3],[16] 23,336 [5],[6]                  
Fair value   23,336 [2],[3],[16] 23,335 [5],[6]                  
Principal amount   23,336 [2],[3],[13],[16] 23,336 [5],[6],[7]                  
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   20,840 [2],[3],[12],[16] 13,835 [5],[6],[9]                  
Fair value   20,840 [2],[3],[12],[16] 13,835 [5],[6],[9]                  
Principal amount   20,840 [2],[3],[12],[13],[16] 13,835 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: New Permian Holdco, L.L.C., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3],[12] 0 [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   1,055 [2],[3],[12],[13] 8,060 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: New Trojan Parent, Inc. Second Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     26,663                  
Fair value [5],[10]     1,421                  
Principal amount [5],[7],[10]     26,762                  
Investment, Identifier [Axis]: Next Holdco, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     3,494                  
Fair value [5],[10]     3,494                  
Principal amount [5],[7],[10]     3,520                  
Investment, Identifier [Axis]: Next Holdco, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   3,471                    
Fair value [2],[14],[15]   3,494                    
Principal amount [2],[13],[14],[15]   3,494                    
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   903                    
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (3)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   339                    
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     0                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     903                  
Investment, Identifier [Axis]: Next Holdco, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (3)                  
Fair value [5],[6],[9]     (3)                  
Principal amount [5],[6],[7],[9]     339                  
Investment, Identifier [Axis]: Notorious Topco, LLC First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     858                  
Fair value [5],[6],[9]     803                  
Principal amount [5],[6],[7],[9]     867                  
Investment, Identifier [Axis]: Notorious Topco, LLC First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     59                  
Fair value [5],[6],[9]     55                  
Principal amount [5],[6],[7],[9]     59                  
Investment, Identifier [Axis]: Notorious Topco, LLC First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     9,896                  
Fair value [5],[11]     9,215                  
Principal amount [5],[7],[11]     9,950                  
Investment, Identifier [Axis]: Notorious Topco, LLC First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     9,769                  
Fair value [5],[11]     9,100                  
Principal amount [5],[7],[11]     9,825                  
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (7) [2],[3],[12] (6) [5],[6],[9]                  
Fair value   (71) [2],[3],[12] (61) [5],[6],[9]                  
Principal amount   880 [2],[3],[12],[13] 822 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   10,017                    
Fair value [2],[3],[16]   9,241                    
Principal amount [2],[3],[13],[16]   10,058                    
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   9,889                    
Fair value [2],[3],[16]   9,126                    
Principal amount [2],[3],[13],[16]   9,932                    
Investment, Identifier [Axis]: Notorious Topco, LLC, First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   870                    
Fair value [2],[3],[16]   805                    
Principal amount [2],[3],[13],[16]   877                    
Investment, Identifier [Axis]: OA Buyer, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     27,493                  
Fair value [5],[10]     27,707                  
Principal amount [5],[7],[10]     27,707                  
Investment, Identifier [Axis]: OA Buyer, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     1,740                  
Fair value [5],[10]     1,754                  
Principal amount [5],[7],[10]     1,754                  
Investment, Identifier [Axis]: OA Buyer, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (36) [2],[3],[12],[46] (36) [5],[6],[9],[47]                  
Fair value   0 [2],[3],[12],[46] 0 [5],[6],[9],[47]                  
Principal amount   3,600 [2],[3],[12],[13],[46] 3,600 [5],[6],[7],[9],[47]                  
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   31,442                    
Fair value [2],[14],[15]   31,513                    
Principal amount [2],[13],[14],[15]   31,513                    
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   27,248                    
Fair value [2],[14],[15]   27,425                    
Principal amount [2],[13],[14],[15]   27,425                    
Investment, Identifier [Axis]: OA Buyer, Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   1,724                    
Fair value [2],[14],[15]   1,736                    
Principal amount [2],[13],[14],[15]   1,736                    
Investment, Identifier [Axis]: OA Topco, L.P., Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   2,000 [2],[3],[46] 2,000 [5],[6],[47]                  
Fair value   7,646 [2],[3],[46] 3,343 [5],[6],[47]                  
Investment, Identifier [Axis]: OEC Holdco, LLC, Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[48],[49]     8,431                  
Fair value [5],[48],[49]     8,115                  
Investment, Identifier [Axis]: OEConnection LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   46,214                    
Fair value [2],[14],[15]   46,430                    
Principal amount [2],[13],[14],[15]   46,430                    
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   8,101                    
Investment, Identifier [Axis]: OEConnection LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (25)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   5,063                    
Investment, Identifier [Axis]: OEConnection LLC, Second Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     23,239                  
Fair value [5],[10]     23,406                  
Principal amount [5],[7],[10]     23,406                  
Investment, Identifier [Axis]: OEConnection LLC, Second Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     11,977                  
Fair value [5],[10]     12,044                  
Principal amount [5],[7],[10]     12,044                  
Investment, Identifier [Axis]: Oranje Holdco, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     7,357                  
Fair value [5],[11]     7,440                  
Principal amount [5],[7],[11]     7,440                  
Investment, Identifier [Axis]: Oranje Holdco, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     7,357                  
Fair value [5],[10]     7,440                  
Principal amount [5],[7],[10]     7,440                  
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (23) [2],[3],[12] (23) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   1,860 [2],[3],[12],[13] 1,860 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   7,370                    
Fair value [2],[14],[15]   7,440                    
Principal amount [2],[13],[14],[15]   7,440                    
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   7,369                    
Fair value [2],[3],[16]   7,440                    
Principal amount [2],[3],[13],[16]   7,440                    
Investment, Identifier [Axis]: Oranje Holdco, Inc., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   5,404                    
Fair value [2],[3],[16]   5,454                    
Principal amount [2],[3],[13],[16]   5,454                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   18,078                    
Fair value [2],[17]   18,161                    
Principal amount [2],[13],[17]   18,161                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[12],[17]   2,348                    
Fair value [2],[12],[17]   2,360                    
Principal amount [2],[12],[13],[17]   2,360                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[12],[17]   0                    
Fair value [2],[12],[17]   0                    
Principal amount [2],[12],[13],[17]   1,865                    
Investment, Identifier [Axis]: PDI TA Holdings, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (9)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,830                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     7,449                  
Fair value [5],[8]     7,514                  
Principal amount [5],[7],[8]     7,514                  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (5) [2],[3],[12] (5) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   486 [2],[3],[12],[13] 486 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   22,332                    
Fair value [2],[17]   22,388                    
Principal amount [2],[13],[17]   22,388                    
Investment, Identifier [Axis]: PPV Intermediate Holdings, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   8,258                    
Fair value [2],[14],[15]   8,258                    
Principal amount [2],[13],[14],[15]   8,258                    
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   14,500                    
Fair value [2],[3]   6,525                    
Principal amount   14,500 [2],[3],[13]                   $ 20,000
Investment, Identifier [Axis]: PPVA Black Elk (Equity) LLC, Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     14,500                  
Fair value [5],[6]     7,975                  
Principal amount [5],[6],[7]     14,500                  
Investment, Identifier [Axis]: PPVA Fund, L.P., Collateralized Financing                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [22],[50] 0 [21],[51]                  
Fair value   0 [22],[50] 0 [21],[51]                  
Principal amount   0 [13],[22],[50] 0 [7],[21],[51]                  
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   7,635                    
Fair value [2],[14],[15]   7,635                    
Principal amount [2],[13],[14],[15]   7,654                    
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16]   258                    
Fair value [2],[3],[12],[16]   258                    
Principal amount [2],[3],[12],[13],[16]   258                    
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (2)                    
Fair value [2],[3],[12]   (2)                    
Principal amount [2],[3],[12],[13]   643                    
Investment, Identifier [Axis]: Park Place Technologies, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (3)                    
Fair value [2],[3],[12]   (3)                    
Principal amount [2],[3],[12],[13]   1,201                    
Investment, Identifier [Axis]: Permian Trust, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[22]   0                    
Fair value [2],[3],[22]   0                    
Principal amount [2],[3],[13],[22]   3,409                    
Investment, Identifier [Axis]: Permian Trust, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[21],[52]     0                  
Fair value [5],[21],[52]     0                  
Principal amount [5],[7],[21],[52]     247                  
Investment, Identifier [Axis]: Permian Trust, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[21]     0                  
Fair value [5],[6],[21]     0                  
Principal amount [5],[6],[7],[21]     3,409                  
Investment, Identifier [Axis]: Permian Trust, Trust Claim                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[22],[53]   0                    
Fair value [2],[22],[53]   0                    
Principal amount [2],[13],[22],[53]   247                    
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [10]     28,148                  
Fair value [10]     28,439                  
Principal amount [7],[10]     28,430                  
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   27,895                    
Fair value [2],[14],[15]   28,145                    
Principal amount [2],[13],[14],[15]   28,145                    
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3],[12] 0 [6],[9]                  
Fair value   0 [2],[3],[12] 1 [6],[9]                  
Principal amount   3,708 [2],[3],[12],[13] 3,708 [6],[7],[9]                  
Investment, Identifier [Axis]: PetVet Care Centers, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (37) [2],[3],[12] (37) [6],[9]                  
Fair value   0 [2],[3],[12] 0 [6],[9]                  
Principal amount   3,708 [2],[3],[12],[13] 3,708 [6],[7],[9]                  
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     16,700                  
Fair value [5],[11]     16,802                  
Principal amount [5],[7],[11]     16,802                  
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     2,287                  
Fair value [5],[11]     2,303                  
Principal amount [5],[7],[11]     2,303                  
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (26) [2],[3],[12],[54] (24) [5],[6],[9],[55]                  
Fair value   0 [2],[3],[12],[54] 0 [5],[6],[9],[55]                  
Principal amount   3,284 [2],[3],[12],[13],[54] 2,446 [5],[6],[7],[9],[55]                  
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   22,997                    
Fair value [2],[3],[16]   23,089                    
Principal amount [2],[3],[13],[16]   23,089                    
Investment, Identifier [Axis]: Pioneer Buyer I, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   2,364                    
Fair value [2],[3],[16]   2,374                    
Principal amount [2],[3],[13],[16]   2,374                    
Investment, Identifier [Axis]: Pioneer Topco I, L.P., Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   2,000 [2],[54],[56] 2,000 [5],[55],[57]                  
Fair value   2,000 [2],[54],[56] 1,796 [5],[55],[57]                  
Investment, Identifier [Axis]: Planview Parent, Inc., Second lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [14],[15]   9,208                    
Fair value [14],[15]   9,208                    
Principal amount [13],[14],[15]   9,231                    
Investment, Identifier [Axis]: Power Grid Holdings, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     18,013                  
Fair value [5],[8]     18,011                  
Principal amount [5],[7],[8]     18,193                  
Investment, Identifier [Axis]: Power Grid Holdings, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     212                  
Fair value [5],[6],[9]     212                  
Principal amount [5],[6],[7],[9]     214                  
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   22,228                    
Fair value [2],[17]   22,387                    
Principal amount [2],[13],[17]   22,387                    
Investment, Identifier [Axis]: Power Grid Holdings, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (43) [2],[3],[12] (41) [5],[6],[9]                  
Fair value   0 [2],[3],[12] (41) [5],[6],[9]                  
Principal amount   4,289 [2],[3],[12],[13] 4,075 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   10,470                    
Fair value [2],[29]   10,519                    
Principal amount [2],[13],[29]   10,519                    
Investment, Identifier [Axis]: Project Accelerate Parent, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (8)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   1,510                    
Investment, Identifier [Axis]: Project Essential Super Parent, Inc., Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   15,929 [2],[3] 13,754 [5],[6]                  
Fair value   14,833 [2],[3] 12,382 [5],[6]                  
Investment, Identifier [Axis]: Project Power Buyer, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     3,513                  
Fair value [5],[10]     3,553                  
Principal amount [5],[7],[10]     3,553                  
Investment, Identifier [Axis]: Project Power Buyer, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (3)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     184                  
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     5,071                  
Fair value [5],[10]     5,109                  
Principal amount [5],[7],[10]     5,109                  
Investment, Identifier [Axis]: Pye-Barker Fire & Safety, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (16)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     1,161                  
Investment, Identifier [Axis]: Quartz Holding Company, Second Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     9,900                  
Fair value [5],[6]     10,000                  
Principal amount [5],[6],[7]     10,000                  
Investment, Identifier [Axis]: RLG Holdings, LLC, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [14],[15]   3,970                    
Fair value [14],[15]   3,934                    
Principal amount [13],[14],[15]   3,970                    
Investment, Identifier [Axis]: Recorded Future, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     24,147                  
Fair value [5],[11]     24,220                  
Principal amount [5],[7],[11]     24,220                  
Investment, Identifier [Axis]: Recorded Future, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     12,484                  
Fair value [5],[10]     12,524                  
Principal amount [5],[7],[10]     12,524                  
Investment, Identifier [Axis]: Recorded Future, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (20)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     2,981                  
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Trust Claim 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[15]   152                    
Fair value [2],[15]   152                    
Principal amount [2],[13],[15]   152                    
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Trust Claim 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   52                    
Fair value [2],[3]   52                    
Principal amount [2],[3],[13]   52                    
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Warrants 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[15]   182                    
Fair value [2],[15]   327                    
Investment, Identifier [Axis]: Reorganized Careismatic Brands, LLC, Warrants 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   62                    
Fair value [2],[3]   112                    
Investment, Identifier [Axis]: Riskonnect Parent, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   6,349                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     6,881                  
Fair value [5],[10]     6,904                  
Principal amount [5],[7],[10]     6,904                  
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     382                  
Fair value [5],[6],[9]     384                  
Principal amount [5],[6],[7],[9]     384                  
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (2)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   384                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   127                    
Fair value [2],[3],[12]   128                    
Principal amount [2],[3],[12],[13]   128                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (1)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     128                  
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   7,425                    
Fair value [2],[14],[15]   7,446                    
Principal amount [2],[13],[14],[15]   7,446                    
Investment, Identifier [Axis]: Safety Borrower Holdings LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   1,523                    
Fair value [2],[3],[16]   1,523                    
Principal amount [2],[3],[13],[16]   1,523                    
Investment, Identifier [Axis]: Sierra Enterprises, LLC                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   38,840                    
Fair value [2],[3],[16]   42,450                    
Principal amount [2],[3],[13],[16]   42,450                    
Investment, Identifier [Axis]: Sierra Enterprises, LLC, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [6]     20,370                  
Fair value [6]     22,055                  
Principal amount [6],[7]     23,780                  
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   11,501 [2],[15] 11,500 [5],[10]                  
Fair value   1,799 [2],[15] 1,799 [5],[10]                  
Investment, Identifier [Axis]: Sierra Hamilton Holdings Corporation, Ordinary shares 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   1,282 [2],[3] 1,282 [5],[6]                  
Fair value   201 [2],[3] 201 [5],[6]                  
Investment, Identifier [Axis]: Specialtycare, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     77                  
Fair value [5],[6],[9]     76                  
Principal amount [5],[6],[7],[9]     78                  
Investment, Identifier [Axis]: Specialtycare, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     10,253                  
Fair value [5],[10]     9,938                  
Principal amount [5],[7],[10]     10,352                  
Investment, Identifier [Axis]: Specialtycare, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     76                  
Fair value [5],[6]     76                  
Principal amount [5],[6],[7]     78                  
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12],[16]   319                    
Fair value [2],[3],[12],[16]   315                    
Principal amount [2],[3],[12],[13],[16]   324                    
Investment, Identifier [Axis]: Specialtycare, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (4) [2],[3],[12] (7) [5],[6],[9]                  
Fair value   (7) [2],[3],[12] (17) [5],[6],[9]                  
Principal amount   235 [2],[3],[12],[13] 481 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   10,167                    
Fair value [2],[14],[15]   9,953                    
Principal amount [2],[13],[14],[15]   10,247                    
Investment, Identifier [Axis]: Specialtycare, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   76                    
Fair value [2],[3],[16]   75                    
Principal amount [2],[3],[13],[16]   77                    
Investment, Identifier [Axis]: Sun Acquirer Corp. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     113                  
Fair value [5],[6],[9]     110                  
Principal amount [5],[6],[7],[9]     112                  
Investment, Identifier [Axis]: Sun Acquirer Corp. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     3,919                  
Fair value [5],[10]     3,878                  
Principal amount [5],[7],[10]     3,945                  
Investment, Identifier [Axis]: Sun Acquirer Corp. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     2,757                  
Fair value [5],[10]     2,740                  
Principal amount [5],[7],[10]     2,788                  
Investment, Identifier [Axis]: Sun Acquirer Corp., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (6)                  
Fair value [5],[6],[9]     (8)                  
Principal amount [5],[6],[7],[9]     447                  
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   16,363 [2],[17] 13,999 [5],[8]                  
Fair value   16,450 [2],[17] 13,807 [5],[8]                  
Investment, Identifier [Axis]: Symplr Software Intermediate Holdings, Inc., Preferred shares 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   5,641 [2],[3],[16] 4,826 [5],[6]                  
Fair value   5,671 [2],[3],[16] 4,759 [5],[6]                  
Investment, Identifier [Axis]: Syndigo LLC, Second Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     22,379                  
Fair value [5],[8]     22,500                  
Principal amount [5],[7],[8]     22,500                  
Investment, Identifier [Axis]: Syndigo LLC, Second Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     5,708                  
Fair value [5],[10]     5,697                  
Principal amount [5],[7],[10]     5,697                  
Investment, Identifier [Axis]: Syndigo LLC, Second lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   22,397                    
Fair value [2],[17]   22,500                    
Principal amount [2],[13],[17]   22,500                    
Investment, Identifier [Axis]: Syndigo LLC, Second lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   5,706                    
Fair value [2],[14],[15]   5,697                    
Principal amount [2],[13],[14],[15]   5,697                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     15,852                  
Fair value [5],[10]     9,736                  
Principal amount [5],[7],[10]     16,227                  
Investment, Identifier [Axis]: TMK Hawk Parent, Corp, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     15,190                  
Fair value [5],[11]     9,392                  
Principal amount [5],[7],[11]     15,651                  
Investment, Identifier [Axis]: TMK Hawk Parent, Corp, First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [10]     1,033                  
Fair value [10]     1,033                  
Principal amount [7],[10]     1,033                  
Investment, Identifier [Axis]: TMK Hawk Parent, Corp, First Lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [11]     996                  
Fair value [11]     996                  
Principal amount [7],[11]     996                  
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   2,695                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[15]   11,782                    
Fair value [2],[15]   10,402                    
Principal amount [2],[13],[15]   12,327                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   9,818                    
Fair value [2],[3],[16]   8,374                    
Principal amount [2],[3],[13],[16]   9,925                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   2,317                    
Fair value [2],[3],[16]   2,351                    
Principal amount [2],[3],[13],[16]   2,843                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[15]   302                    
Fair value [2],[15]   302                    
Principal amount [2],[13],[15]   302                    
Investment, Identifier [Axis]: TMK Hawk Parent, Corp., Subordinated 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   291                    
Fair value [2],[3]   291                    
Principal amount [2],[3],[13]   291                    
Investment, Identifier [Axis]: TRC Companies L.L.C. (fka Energize Holdco LLC) Second Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     7,918                  
Fair value [5],[10]     7,711                  
Principal amount [5],[7],[10]     7,950                  
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Ordinary shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   66,651 [2],[3] 61,449 [5],[6]                  
Fair value   59,978 [2],[3] 95,151 [5],[6]                  
Investment, Identifier [Axis]: TVG-Edmentum Holdings, LLC, Preferred shares                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   7,525                    
Fair value [2],[3]   9,352                    
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16],[20]   19,326                    
Fair value [2],[3],[16],[20]   19,321                    
Principal amount | £ [2],[3],[13],[16],[20]           £ 19,418            
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[58]     17,864                  
Fair value [5],[6],[58]     16,600                  
Principal amount     16,600         £ 13,039 [5],[6],[7],[58]        
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[58]     13,407                  
Fair value [5],[6],[58]     13,664                  
Principal amount | £ [5],[6],[7],[58]               £ 10,734        
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 2 and Tennessee Bidco Limited, First lien 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Principal amount     14,457                  
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     10,200                  
Fair value [5],[6]     10,312                  
Principal amount [5],[6],[7]     10,312                  
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     6,300                  
Fair value [5],[6]     6,373                  
Principal amount [5],[6],[7]     6,373                  
Investment, Identifier [Axis]: Tennessee Bidco Limited, First lien 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[58]     726                  
Fair value [5],[6],[58]     791                  
Principal amount | € [5],[6],[7],[58]             € 716          
Investment, Identifier [Axis]: TigerConnect, Inc. First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     29,644                  
Fair value [5],[11]     29,614                  
Principal amount [5],[7],[11]     29,868                  
Investment, Identifier [Axis]: TigerConnect, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[10]     1,354                  
Fair value [5],[9],[10]     1,343                  
Principal amount [5],[7],[9],[10]     1,354                  
Investment, Identifier [Axis]: TigerConnect, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   29,689                    
Fair value [2],[14],[15]   29,868                    
Principal amount [2],[13],[14],[15]   29,868                    
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[12],[15]   2,440                    
Fair value [2],[12],[15]   2,440                    
Principal amount [2],[12],[13],[15]   2,440                    
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[12],[15] 0 [5],[9],[10]                  
Fair value   0 [2],[12],[15] (8) [5],[9],[10]                  
Principal amount   1,301 [2],[12],[13],[15] 885 [5],[7],[9],[10]                  
Investment, Identifier [Axis]: TigerConnect, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (43) [2],[3],[12] (43) [5],[6],[9]                  
Fair value   0 [2],[3],[12] (36) [5],[6],[9]                  
Principal amount   4,267 [2],[3],[12],[13] 4,267 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Transcendia Holdings, Inc. Second Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     14,445                  
Fair value [5],[11]     7,250                  
Principal amount [5],[7],[11]     14,500                  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[10]     4,038                  
Fair value [5],[9],[10]     4,070                  
Principal amount [5],[7],[9],[10]     4,070                  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     15,283                  
Fair value [5],[10]     15,382                  
Principal amount [5],[7],[10]     15,382                  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[12],[14],[15] 0 [5],[9],[10]                  
Fair value   0 [2],[12],[14],[15] 0 [5],[9],[10]                  
Principal amount   785 [2],[12],[13],[14],[15] 1,182 [5],[7],[9],[10]                  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (15) [2],[3],[12] (15) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   1,501 [2],[3],[12],[13] 1,501 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   15,303                    
Fair value [2],[14],[15]   15,382                    
Principal amount [2],[13],[14],[15]   15,382                    
Investment, Identifier [Axis]: Trinity Air Consultants Holdings Corporation, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   4,438                    
Fair value [2],[14],[15]   4,467                    
Principal amount [2],[13],[14],[15]   4,467                    
Investment, Identifier [Axis]: USRP Holdings, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     11,152                  
Fair value [5],[10]     11,226                  
Principal amount [5],[7],[10]     11,226                  
Investment, Identifier [Axis]: USRP Holdings, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     1,451                  
Fair value [5],[6]     1,462                  
Principal amount [5],[6],[7]     1,462                  
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (9) [2],[3],[12] (9) [5],[6],[9]                  
Fair value   0 [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   893 [2],[3],[12],[13] 893 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   6,946                    
Fair value [2],[3],[16]   6,984                    
Principal amount [2],[3],[13],[16]   6,984                    
Investment, Identifier [Axis]: USRP Holdings, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   5,512                    
Fair value [2],[14],[15]   5,541                    
Principal amount [2],[13],[14],[15]   5,541                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Junior preferred shares, Non-accrual status                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   34,393                    
Fair value   0                    
Unearned dividend income   8,744                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   1,925 [2],[15] 1,925 [5],[10]                  
Fair value   0 [2],[15] 0 [5],[10]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Ordinary shares 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   532 [2],[3] 532 [5],[6]                  
Fair value   0 [2],[3] 0 [5],[6]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   22,803 [2],[3] 18,760 [5],[6]                  
Fair value   20,646 [2],[3] 16,348 [5],[6]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   13,553 [2],[3] 11,150 [5],[6]                  
Fair value   12,682 [2],[3] 10,119 [5],[6]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   19,795 [2],[3],[22] 19,795 [5],[6],[21]                  
Fair value   3,080 [2],[3],[22] 4,210 [5],[6],[21]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   26,946 [2],[15],[22] 26,946 [5],[10],[21]                  
Fair value   0 [2],[15],[22] 0 [5],[10],[21]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred shares 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   7,447 [2],[3],[22] 7,447 [5],[6],[21]                  
Fair value   0 [2],[3],[22] 0 [5],[6],[21]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   15,608 [2],[3] 13,438 [5],[6]                  
Fair value   15,459 [2],[3] 12,893 [5],[6]                  
Principal amount   15,608 [2],[3],[13] 13,438 [5],[6],[7]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Second lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   6,919 [2],[3] 5,957 [5],[6]                  
Fair value   6,853 [2],[3] 5,713 [5],[6]                  
Principal amount   6,919 [2],[3],[13] 5,957 [5],[6],[7]                  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Senior preferred shares, Non-accrual status                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   19,795                    
Fair value   3,080                    
Principal amount                   $ 19,795    
Unearned dividend income   6,749                    
Investment, Identifier [Axis]: UniTek Global Services, Inc., Warrants                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   0 [2],[3] 0 [5],[6]                  
Fair value   48,804 [2],[3] 42,716 [5],[6]                  
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16],[45]   15,181                    
Fair value [2],[3],[16],[45]   14,981                    
Principal amount [2],[3],[13],[16],[45]   12,030                    
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   0                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   4,150                    
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (17)                    
Fair value [2],[3],[12]   (17)                    
Principal amount [2],[3],[12],[13]   3,320                    
Investment, Identifier [Axis]: Viper Bidco. Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Principal amount   15,057                    
Investment, Identifier [Axis]: Virtusa Corporation, Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [6]     7,565                  
Fair value [6]     8,077                  
Principal amount [6],[7]     9,401                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[10]     13,307                  
Fair value [5],[9],[10]     13,336                  
Principal amount [5],[7],[9],[10]     13,336                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     18,715                  
Fair value [5],[10]     18,758                  
Principal amount [5],[7],[10]     18,758                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     1,232                  
Fair value [5],[10]     1,241                  
Principal amount [5],[7],[10]     1,241                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     826                  
Fair value [5],[10]     832                  
Principal amount [5],[7],[10]     832                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (6)                    
Fair value [2],[3],[12]   0                    
Principal amount [2],[3],[12],[13]   2,040                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[10]     0                  
Fair value [5],[9],[10]     0                  
Principal amount [5],[7],[9],[10]     2,396                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (6)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     2,040                  
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   15,565                    
Fair value [2],[14],[15]   15,593                    
Principal amount [2],[13],[14],[15]   15,593                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   11,887                    
Fair value [2],[3],[16]   11,908                    
Principal amount [2],[3],[13],[16]   11,908                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   6,644                    
Fair value [2],[14],[15]   6,659                    
Principal amount [2],[13],[14],[15]   6,659                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 4                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   1,221                    
Fair value [2],[3],[16]   1,228                    
Principal amount [2],[3],[13],[16]   1,228                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, First lien 5                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[16]   819                    
Fair value [2],[3],[16]   824                    
Principal amount [2],[3],[13],[16]   824                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subordinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3]   4,185                    
Fair value [2],[3]   4,231                    
Principal amount [2],[3],[13]   4,231                    
Investment, Identifier [Axis]: Wealth Enhancement Group, LLC, Subrdinated                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6]     3,464                  
Fair value [5],[6]     3,459                  
Principal amount [5],[6],[7]     3,513                  
Investment, Identifier [Axis]: Xactly Corporation, First Lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[8]     22,472                  
Fair value [5],[8]     22,500                  
Principal amount [5],[7],[8]     22,500                  
Investment, Identifier [Axis]: Xactly Corporation, First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[17]   22,483                    
Fair value [2],[17]   22,250                    
Principal amount [2],[13],[17]   22,500                    
Investment, Identifier [Axis]: Xactly Corporation, First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis   (10) [2],[3],[12] (10) [5],[6],[9]                  
Fair value   (11) [2],[3],[12] 0 [5],[6],[9]                  
Principal amount   992 [2],[3],[12],[13] 992 [5],[6],[7],[9]                  
Investment, Identifier [Axis]: YLG Holdings, Inc. First Lien - Drawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[28]     1,196                  
Fair value [5],[9],[28]     1,204                  
Principal amount [5],[7],[9],[28]     1,204                  
Investment, Identifier [Axis]: YLG Holdings, Inc. First Lien - Drawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[28]     80                  
Fair value [5],[9],[28]     80                  
Principal amount [5],[7],[9],[28]     80                  
Investment, Identifier [Axis]: YLG Holdings, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     17,646                  
Fair value [5],[28]     17,676                  
Principal amount [5],[7],[28]     17,677                  
Investment, Identifier [Axis]: YLG Holdings, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[28]     2,298                  
Fair value [5],[28]     2,301                  
Principal amount [5],[7],[28]     2,302                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[29]   21,798                    
Fair value [2],[29]   21,825                    
Principal amount [2],[13],[29]   21,825                    
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[28]     0                  
Fair value [5],[9],[28]     0                  
Principal amount [5],[7],[9],[28]     785                  
Investment, Identifier [Axis]: YLG Holdings, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (20)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     3,968                  
Investment, Identifier [Axis]: iCIMS, Inc. First Lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     467                  
Fair value [5],[6],[9]     471                  
Principal amount [5],[6],[7],[9]     471                  
Investment, Identifier [Axis]: iCIMS, Inc. First Lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[11]     30,569                  
Fair value [5],[11]     31,008                  
Principal amount [5],[7],[11]     30,783                  
Investment, Identifier [Axis]: iCIMS, Inc. First Lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     7,311                  
Fair value [5],[10]     7,440                  
Principal amount [5],[7],[10]     7,366                  
Investment, Identifier [Axis]: iCIMS, Inc. First Lien 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[10]     4,726                  
Fair value [5],[10]     4,807                  
Principal amount [5],[7],[10]     4,772                  
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Drawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   705                    
Fair value [2],[3],[12]   701                    
Principal amount [2],[3],[12],[13]   706                    
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[3],[12]   (25)                    
Fair value [2],[3],[12]   (21)                    
Principal amount [2],[3],[12],[13]   2,824                    
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[11]     0                  
Fair value [5],[9],[11]     0                  
Principal amount [5],[7],[9],[11]     6,293                  
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[9],[10]     0                  
Fair value [5],[9],[10]     0                  
Principal amount [5],[7],[9],[10]     976                  
Investment, Identifier [Axis]: iCIMS, Inc., First lien - Undrawn 3                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [5],[6],[9]     (21)                  
Fair value [5],[6],[9]     0                  
Principal amount [5],[6],[7],[9]     $ 2,347                  
Investment, Identifier [Axis]: iCIMS, Inc., First lien 1                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   44,537                    
Fair value [2],[14],[15]   44,406                    
Principal amount [2],[13],[14],[15]   44,742                    
Investment, Identifier [Axis]: iCIMS, Inc., First lien 2                        
Investment Company, Nonconsolidated Subsidiary [Line Items]                        
Cost basis [2],[14],[15]   7,321                    
Fair value [2],[14],[15]   7,311                    
Principal amount [2],[13],[14],[15]   $ 7,366                    
[1] 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.
[2] 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.
[3] Investment is held by New Mountain Finance Corporation
[4] 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.
[5] 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.
[6] Investment is pledged as collateral for the NMFC Credit Facility, a revolving credit facility among the Company as the Borrower and Goldman Sachs Bank USA as the Administrative Agent and the Collateral Agent and Goldman Sachs Bank USA, Morgan Stanley Bank, N.A., Stifel Bank & Trust and MUFG Union Bank, N.A. as Lenders. See Note 7. Borrowings, for details.
[7] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[8] Investment is held by New Mountain Finance SBIC, L.P.
[9] 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.
[10] 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. ("NMF Holdings") 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.
[11] Investment is pledged as collateral for the DB Credit Facility, a revolving credit facility among New Mountain Finance DB, L.L.C as the Borrower and Deutsche Bank AG, New York Branch as the Facility Agent. See Note 7. Borrowings, for details.
[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] Par amount is denominated in United States Dollar unless otherwise noted, which may include British Pound ("£") and/or Euro ("€").
[14] 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.
[15] Investment is held by New Mountain Finance Holdings, L.L.C.
[16] 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
[17] Investment is held by New Mountain Finance SBIC, L.P.
[18] 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.
[19] 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 preferred equity in ACI Parent Inc. is entitled to receive cumulative preferential dividends at a rate of 11.75% per annum.
[20] 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.
[21] Investment is on non-accrual status. See Note 3. Investments, for details.
[22] Investment is on non-accrual status. See Note 3. Investments, for details.
[23] Investment is held by NMF Ancora Holdings, Inc.
[24] Investment is held by NMF Ancora Holdings, Inc.
[25] The Company holds investments in two wholly-owned subsidiaries of Appriss Health Holdings, Inc. The company holds a first lien term loan and a first lien revolver in Appriss Health, LLC, and preferred equity in Appriss Health Intermediate Holdings, Inc. The preferred equity is entitled to receive preferential dividends at a rate of 11.0% per annum.
[26] 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, 2023, 14.8% of the Company’s total assets are represented by investments at fair value that are considered non-qualifying assets.
[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 holds investments in two wholly-owned subsidiary of Diamond Parent Holdings Corp. The Company holds three first lien term loans and a first lien revolver in Diligent Corporation and preferred equity in Diligent Preferred Issuer Inc. The preferred equity in Diligent Preferred Issuer Inc. is entitled to receive cumulative preferential dividends at a rate 10.5% per annum.
[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.
[32] 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.
[33] 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.
[34] 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.
[35] Investment is held by NMF HB, Inc.
[36] Investment is held by NMF HB, Inc.
[37] Investment is held by NMF TRM, LLC.
[38] Investment is held by NMF QID NGL Holdings, Inc.
[39] 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.
[40] The Company holds preferred equity in Knockout Intermediate Holdings I Inc. and a first lien term loan, a first lien revolver and a first lien delayed draw in Kaseya, Inc., a wholly-owned subsidiary of Knockout Intermediate Holdings I Inc. The preferred equity is entitled to received cumulative preferential dividends at a rate of 11.75% per annum.
[41] 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%.
[42] 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%.
[43] Investment is held by New Mountain Net Lease Corporation.
[44] Investment is held by New Mountain Net Lease Corporation.
[45] 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.
[46] 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.
[47] The Company holds ordinary shares in OA Topco, L.P., and two first lien term loans and a first lien revolver in OA Buyer, Inc., a wholly-owned subsidiary of OA Topco, L.P.
[48] Investment is held by NMF OEC, Inc.
[49] The Company holds preferred equity in OEC Holdco, LLC, and two second lien term loans in OEConnection LLC, a wholly-owned subsidiary of OEC Holdco, LLC. The preferred equity is entitled to receive preferential dividends of 11.0% per annum.
[50] 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.
[51] 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 $16,500 as of December 31, 2023. See Note 2. Summary of Significant Accounting Policies, for details.
[52] Investment is held by NMF Permian Holdings, LLC.
[53] Investment is held by NMF Permian Holdings, LLC.
[54] 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.
[55] 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.
[56] Investment is held by NMF Pioneer, Inc.
[57] Investment is held by NMF Pioneer, Inc.
[58] Investment is denominated in foreign currency and is translated into U.S. dollars as of the valuation date. As of December 31, 2023, the par value U.S. dollar equivalent of the first lien term loan, and drawn first lien term loan is $16,600 and $14,457, respectively. See Note 2. Summary of Significant Accounting Policies, for details.