Fair Value of Financial Instruments - Changes in Fair Value of Investments Using Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 3,096,465	$ 808,801
Purchases or originations	4,580,038	2,283,282
Repayments / redemptions	(313,253)	(80,115)
Sales proceeds	(428,082)
Paid-in-kind interest	33,624	11,144
Net change in unrealized gains (losses)	$ 101,406	$ 61,552
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Change In Unrealized Gains Losses On Investments And Foreign Currency Translation	Net Change In Unrealized Gains Losses On Investments And Foreign Currency Translation
Net realized gains (losses)	$ 4,567
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Realized Gains Losses on Investments and Foreign Currency Translation	Net Realized Gains Losses on Investments and Foreign Currency Translation
Net amortization of discount on securities	$ 24,810	$ 11,801
Balance, End of Period	7,099,575	3,096,465
First-lien Debt Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	2,848,805	800,995
Purchases or originations	4,492,641	2,053,661
Repayments / redemptions	(313,253)	(80,115)
Sales proceeds	(425,921)
Paid-in-kind interest	18,092	4,694
Net change in unrealized gains (losses)	80,053	58,158
Net realized gains (losses)	4,501
Net amortization of discount on securities	23,493	11,412
Balance, End of Period	6,728,411	2,848,805
Second-lien Debt Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	79,091
Purchases or originations	10,021	77,776
Sales proceeds	(2,161)
Paid-in-kind interest	1,213
Net change in unrealized gains (losses)	4,324	1,196
Net realized gains (losses)	66
Net amortization of discount on securities	915	119
Balance, End of Period	93,469	79,091
Mezzanine Debt Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	105,918
Purchases or originations		97,000
Paid-in-kind interest	14,319	6,450
Net change in unrealized gains (losses)	2,545	2,198
Net amortization of discount on securities	402	270
Balance, End of Period	123,184	105,918
Equity and Other Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	62,651	7,806
Purchases or originations	77,376	54,845
Net change in unrealized gains (losses)	14,484
Balance, End of Period	$ 154,511	$ 62,651