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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ 590.2 $ 552.7 $ 1,749.1 $ 1,710.5
Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Adjustments (57.5) (50.1) (158.4) (199.3)
Fund management fees        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 532.7 502.6 1,590.7 1,511.2
Fund management fees | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 526.5 518.1 1,567.6 1,539.3
Fund management fees | Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ (6.4) $ (8.9) $ (19.4) $ (23.8)