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Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Performance revenues $ 1,831.5 $ (17.7) $ 2,033.9 $ (99.2)
Performance revenues related compensation expense 1,151.0 (53.9) 1,222.4 (40.4)
Net performance revenues 634.5 (64.4) 604.3 (163.9)
Adjustments        
Segment Reporting Information [Line Items]        
Performance revenues related compensation expense (965.7) 84.3 (680.5) 326.4
Net performance revenues (543.9) 214.4 (316.0) 558.5
Total Reportable Segments        
Segment Reporting Information [Line Items]        
Net performance revenues 90.6 150.0    
Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Performance revenues related compensation expense 185.3 30.4 541.9 286.0
Net performance revenues 90.6 150.0 288.3 394.6
Performance revenues        
Segment Reporting Information [Line Items]        
Performance revenues 1,785.5 (118.3) 1,826.7 (204.3)
Performance revenues | Adjustments        
Segment Reporting Information [Line Items]        
Performance revenues (1,509.6) 298.7 (996.5) 884.9
Performance revenues | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Performance revenues 275.9 180.4 830.2 680.6
Principal investment income (loss)        
Segment Reporting Information [Line Items]        
Performance revenues 46.0 100.6 207.2 105.1
Principal investment income (loss) | Adjustments        
Segment Reporting Information [Line Items]        
Performance revenues (36.9) (77.2) (137.8) (35.8)
Principal investment income (loss) | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Performance revenues $ 9.1 $ 23.4 $ 69.4 $ 69.3