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Investments - Schedule of Components of Investment Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net Investment Income [Line Items]        
Investment income (loss) $ (519.0) $ 1,831.5 $ 334.8 $ 2,033.9
Reversed unrealized income (30.0) 20.4 (66.5) (107.2)
Carlyle Secured Lending, Inc. Merger        
Net Investment Income [Line Items]        
Reversed unrealized income   48.5   48.5
Performance allocations        
Net Investment Income [Line Items]        
Investment income (loss) (606.7) 1,785.5 255.0 1,826.7
Realized        
Net Investment Income [Line Items]        
Investment income (loss) 49.4 266.4 499.0 804.0
Unrealized        
Net Investment Income [Line Items]        
Investment income (loss) (656.1) 1,519.1 (244.0) 1,022.7
Principal investment income (loss) from equity method investments (excluding performance allocations)        
Net Investment Income [Line Items]        
Investment income (loss) 68.0 103.5 60.7 207.1
Realized        
Net Investment Income [Line Items]        
Investment income (loss) 59.6 38.1 208.5 135.5
Unrealized        
Net Investment Income [Line Items]        
Investment income (loss) 8.4 65.4 (147.8) 71.6
Principal investment income (loss) from investments in CLOs and other investments        
Net Investment Income [Line Items]        
Investment income (loss) 19.7 (57.5) 19.1 0.1
Realized        
Net Investment Income [Line Items]        
Investment income (loss) 1.1 (4.7) 0.7 4.5
Unrealized        
Net Investment Income [Line Items]        
Investment income (loss) $ 18.6 $ (52.8) $ 18.4 (4.4)
Unrealized | Corporate Investment        
Net Investment Income [Line Items]        
Investment income (loss)       $ 5.3