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Investment Portfolio - Schedule of Operations Information for COPJV (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 398.0 $ 439.0 $ 798.0 $ 873.0
Expenses        
Professional services 2.0 2.0 5.0 5.0
Credit Opportunities Partners JV, LLC        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income 109.0 90.2 191.2 180.8
Expenses        
Interest expense 35.1 29.9 63.4 62.3
Custodian and accounting fees 0.3 0.4 0.7 0.8
Administrative services 2.8 2.3 5.1 4.7
Professional services 0.1 0.2 0.2 0.3
Other 1.6 0.4 1.8 0.6
Total expenses 39.9 33.2 71.2 68.7
Net investment income 69.1 57.0 120.0 112.1
Net realized and unrealized gain (loss) (34.2) (0.6) (33.1) (3.2)
Net increase in net assets resulting from operations $ 34.9 $ 56.4 $ 86.9 $ 108.9