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Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Investment income (loss) $ 2,254.4 $ 44.8 $ 1,898.0
Performance revenues related compensation expense 1,361.5 1,103.7 719.9
Performance allocations      
Segment Reporting Information [Line Items]      
Investment income (loss) 2,015.7 (88.6) 1,327.5
Performance revenues related compensation expense 1,361.5 1,103.7 719.9
Net performance revenues 654.2 (1,192.3) 607.6
Performance allocations | Adjustments      
Segment Reporting Information [Line Items]      
Investment income (loss) (939.8) 1,026.9 653.2
Performance revenues related compensation expense (651.7) (696.4) 262.3
Net performance revenues (288.1) 1,723.3 390.9
Performance allocations | Total Reportable Segments | Global Segments      
Segment Reporting Information [Line Items]      
Investment income (loss) 1,075.9 938.3 1,980.7
Performance revenues related compensation expense 709.8 407.3 982.2
Net performance revenues 366.1 531.0 998.5
Principal investment income      
Segment Reporting Information [Line Items]      
Investment income (loss) 238.7 133.4 570.5
Principal investment income | Adjustments      
Segment Reporting Information [Line Items]      
Investment income (loss) (137.7) (44.6) (419.9)
Principal investment income | Total Reportable Segments | Global Segments      
Segment Reporting Information [Line Items]      
Investment income (loss) $ 101.0 $ 88.8 $ 150.6