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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Total Reportable Segments    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees $ 551.4 $ 514.9
Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Adjustments (50.6) (64.4)
Fund management fees    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees 500.8 450.5
Fund management fees | Total Reportable Segments    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees 506.2 454.2
Fund management fees | Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees $ (7.6) $ (6.4)