v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Performance revenues $ 113.9 $ 694.0 $ (502.8) $ 853.8
Performance revenues related compensation expense 93.6 443.6 (274.3) 615.0
Performance revenues        
Segment Reporting [Line Items]        
Performance revenues 44.7 638.8 (636.4) 861.7
Performance revenues related compensation expense 93.6 443.6 (274.3) 615.0
Net performance revenues (48.9) 195.2 (362.1) 246.7
Performance revenues | Adjustments        
Segment Reporting [Line Items]        
Performance revenues 270.1 (379.0) 1,013.0 (246.8)
Performance revenues related compensation expense 106.6 (271.5) 515.8 (215.2)
Net performance revenues 163.5 (107.5) 497.2 (31.6)
Performance revenues | Total Reportable Segments | Global Segments        
Segment Reporting [Line Items]        
Performance revenues 314.8 259.8 376.6 614.9
Performance revenues related compensation expense 200.2 172.1 241.5 399.8
Net performance revenues 114.6 87.7 135.1 215.1
Principal investment income (loss)        
Segment Reporting [Line Items]        
Performance revenues 69.2 55.2 133.6 (7.9)
Principal investment income (loss) | Adjustments        
Segment Reporting [Line Items]        
Performance revenues (46.6) (21.7) (82.8) 71.4
Principal investment income (loss) | Total Reportable Segments | Global Segments        
Segment Reporting [Line Items]        
Performance revenues $ 22.6 $ 33.5 $ 50.8 $ 63.5