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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Total Reportable Segments    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees $ 514.9 $ 411.9
Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Adjustments (64.4) (30.9)
Fund management fees    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees 450.5 381.0
Fund management fees | Total Reportable Segments    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees 454.2 382.8
Fund management fees | Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees $ (6.4) $ (5.8)