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Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Performance revenues $ 694.0 $ 286.3 $ 853.8 $ 202.4
Performance revenues related compensation expense 443.6 144.2 615.0 71.4
Performance revenues        
Segment Reporting Information [Line Items]        
Performance revenues 638.8 198.2 861.7 41.2
Performance revenues related compensation expense 443.6 144.2 615.0 71.4
Net performance revenues 195.2 54.0 246.7 (30.2)
Performance revenues | Adjustments        
Segment Reporting Information [Line Items]        
Performance revenues (379.0) (41.7) (246.8) 513.1
Performance revenues related compensation expense (271.5) (43.4) (215.2) 285.2
Net performance revenues (107.5) 1.7 (31.6) 227.9
Performance revenues | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Performance revenues 259.8 156.5 614.9 554.3
Performance revenues related compensation expense 172.1 100.8 399.8 356.6
Net performance revenues 87.7 55.7 215.1 197.7
Principal investment income (loss)        
Segment Reporting Information [Line Items]        
Performance revenues 55.2 88.1 (7.9) 161.2
Principal investment income (loss) | Adjustments        
Segment Reporting Information [Line Items]        
Performance revenues (21.7) (61.5) 71.4 (100.9)
Principal investment income (loss) | Total Reportable Segments | Global Segments        
Segment Reporting Information [Line Items]        
Performance revenues $ 33.5 $ 26.6 $ 63.5 $ 60.3