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Investments - Components of Investment Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net Investment Income [Line Items]        
Investment income (loss) $ (17.7) $ 422.3 $ (99.2) $ 1,846.7
Performance allocations - realized        
Net Investment Income [Line Items]        
Investment income (loss) 49.1 770.5 614.8 1,579.0
Performance allocations - unrealized        
Net Investment Income [Line Items]        
Investment income (loss) (167.4) (472.4) (819.1) (232.8)
Performance allocations        
Net Investment Income [Line Items]        
Investment income (loss) (118.3) 298.1 (204.3) 1,346.2
Principal investment income (loss) from equity method investments (excluding performance allocations) - realized        
Net Investment Income [Line Items]        
Investment income (loss) 177.8 70.6 181.9 34.3
Principal investment income (loss) from equity method investments (excluding performance allocations) - unrealized        
Net Investment Income [Line Items]        
Investment income (loss) (85.2) 80.3 (94.9) 536.5
Principal investment income (loss) from equity method investments        
Net Investment Income [Line Items]        
Investment income (loss) 92.6 150.9 87.0 570.8
Principal investment income (loss) from investments in CLOs and other investments - realized        
Net Investment Income [Line Items]        
Investment income (loss) 0.5 6.2 0.4 9.4
Principal investment income (loss) from investments in CLOs and other investments - unrealized        
Net Investment Income [Line Items]        
Investment income (loss) 7.5 (32.9) 17.7 (79.7)
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) $ 8.0 $ (26.7) $ 18.1 $ (70.3)