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Investments - Components of Investment Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net Investment Income [Line Items]    
Investment income (loss) $ (83.9) $ 172.5
Performance allocations - realized    
Net Investment Income [Line Items]    
Investment income (loss) 389.7 179.6
Performance allocations - unrealized    
Net Investment Income [Line Items]    
Investment income (loss) (546.7) (18.8)
Performance allocations    
Net Investment Income [Line Items]    
Investment income (loss) (157.0) 160.8
Principal investment income (loss) from equity method investments (excluding performance allocations) - realized    
Net Investment Income [Line Items]    
Investment income (loss) 53.7 38.5
Principal investment income (loss) from equity method investments (excluding performance allocations) - unrealized    
Net Investment Income [Line Items]    
Investment income (loss) (6.6) (30.2)
Principal investment income (loss) from equity method investments    
Net Investment Income [Line Items]    
Investment income (loss) 47.1 8.3
Principal investment income (loss) from investments in CLOs and other investments - realized    
Net Investment Income [Line Items]    
Investment income (loss) 2.2 (1.1)
Principal investment income (loss) from investments in CLOs and other investments - unrealized    
Net Investment Income [Line Items]    
Investment income (loss) 23.8 4.5
Principal investment income (loss) from investments in CLOs and other investments - unrealized | Corporate Investment    
Net Investment Income [Line Items]    
Investment income (loss)   13.3
Principal investment income (loss) from investments in CLOs and other investments    
Net Investment Income [Line Items]    
Investment income (loss) $ 26.0 $ 3.4