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Investment Portfolio - Schedule of Operations Information for COPJV (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Total investment income $ 304.0 $ 400.0
Expenses    
Professional services 2.0 3.0
Other general and administrative expenses 6.0 5.0
Credit Opportunities Partners JV, LLC    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Total investment income 108.8 82.2
Expenses    
Interest expense 38.8 28.3
Custodian and accounting fees 0.4 0.4
Administrative services 3.1 2.3
Professional services 0.1 0.1
Other general and administrative expenses 0.2 0.2
Total expenses 42.6 31.3
Net investment income 66.2 50.9
Net realized and unrealized gain (loss) (85.5) 1.1
Net increase in net assets resulting from operations $ (19.3) $ 52.0