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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ 587.5 $ 606.4 $ 1,158.9 $ 1,157.8
Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Adjustments (53.1) (98.6) (100.9) (149.2)
Fund management fees        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 534.4 507.8 1,058.0 1,008.6
Fund management fees | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 525.5 515.0 1,041.1 1,021.2
Fund management fees | Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ (6.4) $ (7.3) $ (13.0) $ (14.9)