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Fair Value of Investments - Schedule of Changes in the Fair Value of Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Total |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers into (out of) Level 3 |  | $ (11,467) |  |
Total | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | $ 14,349,099 | 16,995,613 | $ 15,572,144 | $ 12,567,261
Purchases of investments, net | 474,882 | 713,028 | 840,835 | 1,539,507
Payment-in-kind | 42,358 | 53,825 | 84,967 | 107,040
Proceeds from investments, net | (817,803) | (1,611,045) | (2,300,289) | (2,144,974)
Net amortization/accretion of discount/premium on investments | 15,527 | 39,750 | 33,396 | 57,566
Transfers between investment types | 0 |  | 0 |
Transfers into (out of) Level 3 | 19,478 |  | 25,228 | (22,493)
Transfers in from the OBDE Mergers |  |  |  | 3,997,087
Fair value, end of period | 13,947,677 | 16,120,811 | 13,947,677 | 16,120,811
Total | Level 3 | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (13,718) | 27,318 | (110,467) | (87,059)
Total | Level 3 | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossOnInvestments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (122,146) | (86,211) | (198,137) | 106,876
First-Lien Senior Secured |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers into (out of) Level 3 |  | (3,847) |  |
First-Lien Senior Secured | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 11,003,920 | 13,534,635 | 12,009,907 | 9,796,885
Purchases of investments, net | 454,452 | 478,573 | 804,632 | 1,202,373
Payment-in-kind | 15,911 | 16,011 | 32,258 | 40,649
Proceeds from investments, net | (532,518) | (1,379,333) | (1,819,971) | (1,883,856)
Net amortization/accretion of discount/premium on investments | 11,026 | 35,042 | 26,920 | 51,130
Transfers between investment types | 0 |  | (158) |
Transfers into (out of) Level 3 | (8,967) |  | (387) | (29,148)
Transfers in from the OBDE Mergers |  |  |  | 3,450,900
Fair value, end of period | 10,893,570 | 12,598,969 | 10,893,570 | 12,598,969
First-Lien Senior Secured | Level 3 | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (2,859) | 4,410 | (58,263) | (6,545)
First-Lien Senior Secured | Level 3 | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossOnInvestments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (47,395) | (86,522) | (101,368) | (23,419)
Second-Lien Senior Secured |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers into (out of) Level 3 |  | (7,620) |  |
Second-Lien Senior Secured | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 730,176 | 846,978 | 801,281 | 660,060
Purchases of investments, net | 0 | 148,500 | 1 | 141,009
Payment-in-kind | 2,030 | 8,974 | 4,047 | 15,504
Proceeds from investments, net | (24,953) | (122,716) | (41,676) | (129,182)
Net amortization/accretion of discount/premium on investments | 945 | 3,547 | 2,266 | 4,486
Transfers between investment types | 0 |  | 0 |
Transfers into (out of) Level 3 | 43,181 |  | 47,294 | 9,746
Transfers in from the OBDE Mergers |  |  |  | 177,535
Fair value, end of period | 674,223 | 863,667 | 674,223 | 863,667
Second-Lien Senior Secured | Level 3 | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (8,648) | 0 | (8,503) | (102,791)
Second-Lien Senior Secured | Level 3 | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossOnInvestments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (68,508) | (13,996) | (130,487) | 87,300
Unsecured |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers into (out of) Level 3 |  | 0 |  |
Unsecured | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 369,374 | 377,711 | 399,962 | 301,956
Purchases of investments, net | 0 | 0 | 0 | 0
Payment-in-kind | 10,220 | 10,918 | 21,853 | 23,469
Proceeds from investments, net | (2,044) | (24,233) | (41,400) | (33,743)
Net amortization/accretion of discount/premium on investments | 106 | 488 | 197 | 628
Transfers between investment types | 0 |  | 0 |
Transfers into (out of) Level 3 | 0 |  | 0 | 0
Transfers in from the OBDE Mergers |  |  |  | 66,164
Fair value, end of period | 377,224 | 374,693 | 377,224 | 374,693
Unsecured | Level 3 | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | 216 | 641 | 2,471 | (1,212)
Unsecured | Level 3 | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossOnInvestments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (648) | 9,168 | (5,859) | 17,431
Specialty Finance |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers into (out of) Level 3 |  | 0 |  |
Specialty Finance | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 159,598 | 121,603 | 157,297 | 90,735
Purchases of investments, net | 11,887 | 9,813 | 11,887 | 25,594
Payment-in-kind | 327 | 729 | 2,913 | 743
Proceeds from investments, net | (558) | 0 | (843) | 0
Net amortization/accretion of discount/premium on investments | 11 | 7 | 23 | 13
Transfers between investment types | 0 |  | 0 |
Transfers into (out of) Level 3 | 0 |  | 0 | 0
Transfers in from the OBDE Mergers |  |  |  | 14,779
Fair value, end of period | 171,254 | 132,173 | 171,254 | 132,173
Specialty Finance | Level 3 | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | 0 | 0 | 0 | 0
Specialty Finance | Level 3 | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossOnInvestments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (11) | 21 | (23) | 309
Preferred |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers into (out of) Level 3 |  | 0 |  |
Preferred | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 536,853 | 543,191 | 568,977 | 366,973
Purchases of investments, net | 0 | 2,909 | 976 | 46,930
Payment-in-kind | 13,583 | 16,928 | 23,331 | 26,153
Proceeds from investments, net | (255,892) | (4,982) | (292,441) | (15,358)
Net amortization/accretion of discount/premium on investments | 3,439 | 666 | 3,990 | 1,309
Transfers between investment types | 0 |  | 0 |
Transfers into (out of) Level 3 | 0 |  | 0 | 0
Transfers in from the OBDE Mergers |  |  |  | 128,882
Fair value, end of period | 262,536 | 553,787 | 262,536 | 553,787
Preferred | Level 3 | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (50) | 49 | (20,027) | 152
Preferred | Level 3 | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossOnInvestments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (35,397) | (4,974) | (22,270) | (1,254)
Common |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers into (out of) Level 3 |  | 0 |  |
Common | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 537,854 | 634,300 | 520,542 | 550,886
Purchases of investments, net | 3,154 | 4,401 | 15,222 | 4,386
Payment-in-kind | 287 | 265 | 565 | 522
Proceeds from investments, net | (353) | (77,386) | (1,416) | (77,371)
Net amortization/accretion of discount/premium on investments | 0 | 0 | 0 | 0
Transfers between investment types | 0 |  | 158 |
Transfers into (out of) Level 3 | (14,736) |  | (21,679) | (3,091)
Transfers in from the OBDE Mergers |  |  |  | 83,590
Fair value, end of period | 556,928 | 564,845 | 556,928 | 564,845
Common | Level 3 | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | (2,377) | 22,218 | (26,145) | 22,218
Common | Level 3 | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossOnInvestments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | 33,099 | (18,953) | 69,681 | (16,295)
Specialty Finance |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Transfers into (out of) Level 3 |  | 0 |  |
Specialty Finance | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 1,011,324 | 937,195 | 1,114,178 | 799,766
Purchases of investments, net | 5,389 | 68,832 | 8,117 | 119,215
Payment-in-kind | 0 | 0 | 0 | 0
Proceeds from investments, net | (1,485) | (2,395) | (102,542) | (5,464)
Net amortization/accretion of discount/premium on investments | 0 | 0 | 0 | 0
Transfers between investment types | 0 |  | 0 |
Transfers into (out of) Level 3 | 0 |  | 0 | 0
Transfers in from the OBDE Mergers |  |  |  | 75,237
Fair value, end of period | 1,011,942 | 1,032,677 | 1,011,942 | 1,032,677
Specialty Finance | Level 3 | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | 0 | 0 | 0 | 1,119
Specialty Finance | Level 3 | Income Statement Location [Axis]: us-gaap:UnrealizedGainLossOnInvestments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net change in unrealized gain (loss) / realized gains (losses) | $ (3,286) | $ 29,045 | $ (7,811) | $ 42,804

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