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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Total Reportable Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ 569.7 $ 440.1 $ 1,678.1 $ 1,277.4
Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Adjustments (33.8) (32.6) (145.2) (94.5)
Fund management fees        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 535.9 407.5 1,532.9 1,182.9
Fund management fees | Total Reportable Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 514.1 405.7 1,484.5 1,187.9
Fund management fees | Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ (6.2) $ (6.8) $ (19.1) $ (18.6)