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Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Investment income (loss) $ (17.7) $ 422.3 $ (99.2) $ 1,846.7
Performance revenues related compensation expense (53.9) 163.5 (40.4) 741.2
Net performance revenues (64.4) 134.6 (163.9) 605.0
Adjustments        
Segment Reporting Information [Line Items]        
Performance revenues related compensation expense 84.3 210.2 326.4 (0.2)
Net performance revenues 214.4 256.5 558.5 175.0
Total Reportable Segments        
Segment Reporting Information [Line Items]        
Net performance revenues 150.0 391.1   780.0
Performance allocations        
Segment Reporting Information [Line Items]        
Investment income (loss) (118.3) 298.1 (204.3) 1,346.2
Performance allocations | Adjustments        
Segment Reporting Information [Line Items]        
Investment income (loss) 298.7 466.7 884.9 174.8
Principal investment income        
Segment Reporting Information [Line Items]        
Investment income (loss) 100.6 124.2 105.1 500.5
Principal investment income | Adjustments        
Segment Reporting Information [Line Items]        
Investment income (loss) $ (77.2) $ (67.5) $ (35.8) $ (373.7)