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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ 653.7 $ 590.2 $ 1,972.8 $ 1,749.1
Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Adjustments (70.4) (57.5) (183.0) (158.4)
Fund management fees        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 583.3 532.7 1,789.8 1,590.7
Fund management fees | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 573.9 526.5 1,689.0 1,567.6
Fund management fees | Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ (16.7) $ (6.4) $ (32.6) $ (19.4)