Investments at Fair Value - Summary of Investments at Fair Value (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 4,910,340	$ 3,037,826
Fair Value	5,006,147	3,099,151
Net Unrealized Gain (Loss)	95,807	61,325
First-lien Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,620,672	2,792,928
Fair Value	4,705,472	2,850,885
Net Unrealized Gain (Loss)	84,800	57,957
Second-lien Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	86,743	77,895
Fair Value	90,299	79,091
Net Unrealized Gain (Loss)	3,556	1,196
Mezzanine Debt Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	112,015	104,352
Fair Value	116,296	106,524
Net Unrealized Gain (Loss)	4,281	2,172
Equity and Other Investments
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	90,910	62,651
Fair Value	94,080	$ 62,651
Net Unrealized Gain (Loss)	$ 3,170