Fair Value of Financial Instruments - Changes in Fair Value of Investments Using Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 808,801
Purchases or originations	2,283,282	$ 808,259
Repayments / redemptions	(80,115)
Paid-in-kind interest	11,144
Net change in unrealized gains (losses)	$ 61,552	$ (228)
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
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 amortization of discount on securities	$ 11,801	$ 770
Balance, End of Period	3,096,465	808,801
First-lien Debt Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	800,995
Purchases or originations	2,053,661	800,453
Repayments / redemptions	(80,115)
Paid-in-kind interest	4,694
Net change in unrealized gains (losses)	58,158	(228)
Net amortization of discount on securities	11,412	770
Balance, End of Period	2,848,805	800,995
Second-lien Debt Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases or originations	77,776
Net change in unrealized gains (losses)	1,196
Net amortization of discount on securities	119
Balance, End of Period	79,091
Mezzanine Debt Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Purchases or originations	97,000
Paid-in-kind interest	6,450
Net change in unrealized gains (losses)	2,198
Net amortization of discount on securities	270
Balance, End of Period	105,918
Equity and Other Investments
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	7,806
Purchases or originations	54,845	7,806
Balance, End of Period	$ 62,651	$ 7,806