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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fund management fees      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees $ 2,188.1 $ 2,043.2 $ 2,030.1
Total Reportable Segments | Global Segments      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees 2,403.8 2,305.8 2,237.3
Total Reportable Segments | Fund management fees      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees     1,996.9
Total Reportable Segments | Fund management fees | Global Segments      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees 2,107.5 2,064.4  
Adjustments      
Segment Reporting Information [Line Items]      
Adjustments (215.7) (262.6) (207.2)
Adjustments | Fund management fees      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees $ (30.2) $ (31.1) $ (26.6)