Borrowings - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt Disclosure [Abstract]
Asset coverage ratio	181.70%		181.70%		170.20%
Interest expense, payable	$ 276.3		$ 276.3		$ 47.7
Unused borrowing capacity fee payable	$ 6.5		$ 6.5		$ 2.6
Weighted average interest rate	4.17%	2.19%	3.27%	2.16%
Average amount outstanding	$ 27,552.4	$ 6,814.9	$ 22,342.7	$ 3,512.9