Income Taxes - Schedule of Changes in Net Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Net increase (decrease) in net assets resulting from operations	$ 3,484,528	$ 3,363,183	$ 663,070
Net change in unrealized (appreciation) depreciation	97,287	(615,705)	1,045,678
Realized gains (losses) for tax not included in book income	(479,261)	(188,075)	31,297
Non-deductible capital gains based incentive fees	0	0	(15,058)
Other non-deductible expenses and excise taxes	37,574	35,795	5,117
Realized losses for tax not recognized	612,779	489,701	220,696
Taxable/distributable income	$ 3,752,907	$ 3,084,899	$ 1,950,800