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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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