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Segment Reporting - Reconciliation of Fund Level Fee Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Adjustments $ (50.1) $ (33.8) $ (199.3) $ (145.2)
Fund management fees        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees 502.6 535.9 1,511.2 1,532.9
Fund management fees | Elimination of revenues of Consolidated Funds        
Segment Reporting Information [Line Items]        
Fund management fees and incentive fees $ (8.9) $ (6.2) $ (23.8) $ (19.1)