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Investment Portfolio - Schedule of Operations Information for COPJV (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Total investment income $ 400.0 $ 434.0
Expenses    
Professional services 3.0 3.0
Credit Opportunities Partners JV, LLC    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Total investment income 82.2 90.6
Expenses    
Interest expense 28.3 32.4
Custodian and accounting fees 0.4 0.4
Administrative services 2.3 2.4
Professional services 0.1 0.1
Other 0.2 0.2
Total expenses 31.3 35.5
Net investment income 50.9 55.1
Net realized and unrealized gain (loss) 1.1 (2.6)
Net increase in net assets resulting from operations $ 52.0 $ 52.5