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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees $ 642.9 $ 571.4
Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Adjustments (56.8) (47.8)
Fund management fees    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees 586.1 523.6
Fund management fees | Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees 525.5 515.6
Fund management fees | Elimination of revenues of Consolidated Funds    
Segment Reporting Information [Line Items]    
Fund management fees and incentive fees $ (8.3) $ (6.6)