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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees $ 571.4 $ 551.4
Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Adjustments (47.8) (50.6)
Fund management fees    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees 523.6 500.8
Fund management fees | Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees 515.6 506.2
Fund management fees | Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees $ (6.6) $ (7.6)