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Investments - Schedule of Components of Investment Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net Investment Income [Line Items]        
Investment income (loss) $ 694.0 $ 286.3 $ 853.8 $ 202.4
Performance allocations        
Net Investment Income [Line Items]        
Investment income (loss) 638.8 198.2 861.7 41.2
Realized        
Net Investment Income [Line Items]        
Investment income (loss) 116.7 147.9 449.6 537.6
Unrealized        
Net Investment Income [Line Items]        
Investment income (loss) 522.1 50.3 412.1 (496.4)
Principal investment income (loss) from equity method investments (excluding performance allocations)        
Net Investment Income [Line Items]        
Investment income (loss) 55.4 56.5 (7.3) 103.6
Realized        
Net Investment Income [Line Items]        
Investment income (loss) 178.3 43.7 148.9 97.4
Unrealized        
Net Investment Income [Line Items]        
Investment income (loss) (122.9) 12.8 (156.2) 6.2
Principal investment income (loss) from investments in CLOs and other investments        
Net Investment Income [Line Items]        
Investment income (loss) (0.2) 31.6 (0.6) 57.6
Realized        
Net Investment Income [Line Items]        
Investment income (loss) 1.6 7.0 (0.4) 9.2
Unrealized        
Net Investment Income [Line Items]        
Investment income (loss) $ (1.8) $ 24.6 $ (0.2) $ 48.4