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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Global Investment Solutions      
Segment Reporting Information [Line Items]      
Unfunded commitment, fair market value of interest $ 12.7    
Total Reportable Segments      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees 2,237.3 $ 1,794.8 $ 1,616.1
Total Reportable Segments | Global Investment Solutions      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees 222.9 228.9 193.1
Adjustments      
Segment Reporting Information [Line Items]      
Adjustments (207.2) (127.3) (130.1)
Fund management fees      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees 2,030.1 1,667.5 1,486.0
Fund management fees | Total Reportable Segments      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees 1,996.9 1,654.6 1,523.3
Fund management fees | Total Reportable Segments | Global Investment Solutions      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees 222.9 228.4 193.0
Fund management fees | Adjustments      
Segment Reporting Information [Line Items]      
Fund management fees and incentive fees $ (26.6) $ (24.0) $ (27.6)