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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Total Reportable Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ 593.5 $ 425.4 $ 1,108.4 $ 837.3
Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Adjustments (47.0) (31.0) (111.4) (61.9)
Fund management fees        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 546.5 394.4 997.0 775.4
Fund management fees | Total Reportable Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 516.2 399.4 970.4 782.2
Fund management fees | Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ (6.5) $ (6.0) $ (12.9) $ (11.8)