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Investments - Components of Investment Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net Investment Income [Line Items]    
Investment income (loss) $ 159.8 $ (83.9)
Performance allocations    
Net Investment Income [Line Items]    
Investment income (loss) 222.9 (157.0)
Realized    
Net Investment Income [Line Items]    
Investment income (loss) 332.9 389.7
Unrealized    
Net Investment Income [Line Items]    
Investment income (loss) (110.0) (546.7)
Principal investment income (loss) from equity method investments    
Net Investment Income [Line Items]    
Investment income (loss) (62.7) 47.1
Realized    
Net Investment Income [Line Items]    
Investment income (loss) (29.4) 53.7
Unrealized    
Net Investment Income [Line Items]    
Investment income (loss) (33.3) (6.6)
Principal investment income (loss) from investments in CLOs and other investments    
Net Investment Income [Line Items]    
Investment income (loss) (0.4) 26.0
Realized    
Net Investment Income [Line Items]    
Investment income (loss) (2.0) 2.2
Unrealized    
Net Investment Income [Line Items]    
Investment income (loss) $ 1.6 $ 23.8