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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Total Reportable Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ 606.4 $ 593.5 $ 1,157.8 $ 1,108.4
Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Adjustments (98.6) (47.0) (149.2) (111.4)
Fund management fees        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 507.8 546.5 1,008.6 997.0
Fund management fees | Total Reportable Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 515.0 516.2 1,021.2 970.4
Fund management fees | Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ (7.3) $ (6.5) $ (14.9) $ (12.9)