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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Performance revenues $ (519.0) $ 1,831.5 $ 334.8 $ 2,033.9
Performance revenues related compensation expense (324.6) 1,151.0 290.4 1,222.4
Performance revenues        
Segment Reporting Information [Line Items]        
Performance revenues (606.7) 1,785.5 255.0 1,826.7
Performance revenues related compensation expense (324.6) 1,151.0 290.4 1,222.4
Net performance revenues (282.1) 634.5 (35.4) 604.3
Performance revenues | Adjustments        
Segment Reporting Information [Line Items]        
Performance revenues 668.4 (1,509.6) 421.6 (996.5)
Performance revenues related compensation expense 367.2 (965.7) 152.0 (680.5)
Net performance revenues 301.2 (543.9) 269.6 (316.0)
Performance revenues | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Performance revenues 61.7 275.9 676.6 830.2
Performance revenues related compensation expense 42.6 185.3 442.4 541.9
Net performance revenues 19.1 90.6 234.2 288.3
Principal investment income (loss)        
Segment Reporting Information [Line Items]        
Performance revenues 87.7 46.0 79.8 207.2
Principal investment income (loss) | Adjustments        
Segment Reporting Information [Line Items]        
Performance revenues (38.2) (36.9) 33.2 (137.8)
Principal investment income (loss) | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Performance revenues $ 49.5 $ 9.1 $ 113.0 $ 69.4