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Investments - Components of Investment Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net Investment Income [Line Items]    
Investment income (loss) $ 172.5 $ 1,029.8
Performance allocations - realized    
Net Investment Income [Line Items]    
Investment income (loss) 179.6 266.9
Performance allocations - unrealized    
Net Investment Income [Line Items]    
Investment income (loss) (18.8) 443.3
Performance allocations    
Net Investment Income [Line Items]    
Investment income (loss) 160.8 710.2
Principal investment income (loss) from equity method investments (excluding performance allocations) - realized    
Net Investment Income [Line Items]    
Investment income (loss) 38.5 32.8
Principal investment income (loss) from equity method investments (excluding performance allocations) - unrealized    
Net Investment Income [Line Items]    
Investment income (loss) (30.2) 295.3
Principal investment income (loss) from equity method investments (excluding performance allocations)    
Net Investment Income [Line Items]    
Investment income (loss) 8.3 328.1
Principal investment income (loss) from investments in CLOs and other investments - realized    
Net Investment Income [Line Items]    
Investment income (loss) (1.1) 2.3
Principal investment income (loss) from investments in CLOs and other investments - unrealized    
Net Investment Income [Line Items]    
Investment income (loss) 4.5 (10.8)
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) $ 3.4 $ (8.5)