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Investment Portfolio - Operations Information for COPJV (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investment Company, Nonconsolidated Subsidiary [Line Items]
Total investment income	$ 348.0	$ 373.0	$ 398.0	$ 400.0	$ 407.0	$ 441.0	$ 439.0	$ 434.0	$ 1,519.0	$ 1,721.0	$ 1,830.0
Expenses
Professional services									10.0	10.0	12.0
Net investment income									676.0	836.0	$ 914.0
Credit Opportunities Partners JV, LLC
Investment Company, Nonconsolidated Subsidiary [Line Items]
Total investment income									400.0	349.2
Expenses
Interest expense									133.6	120.9
Custodian and accounting fees									1.5	1.6
Administrative services									11.1	9.3
Professional services									0.7	0.6
Other									2.6	1.0
Net expenses									149.5	133.4
Net investment income									250.5	215.8
Net realized and unrealized losses									(26.7)	(22.1)
Net increase in net assets resulting from operations									$ 223.8	$ 193.7

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