v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Performance revenues $ (507.3) $ (519.0) $ (1,010.1) $ 334.8
Performance revenues related compensation expense (334.5) (324.6) (608.8) 290.4
Performance revenues        
Segment Reporting [Line Items]        
Performance revenues (626.6) (606.7) (1,263.0) 255.0
Performance revenues related compensation expense (334.5) (324.6) (608.8) 290.4
Net performance revenues (292.1) (282.1) (654.2) (35.4)
Performance revenues | Adjustments        
Segment Reporting [Line Items]        
Performance revenues 912.6 668.4 1,925.6 421.6
Performance revenues related compensation expense 520.7 367.2 1,036.5 152.0
Net performance revenues 391.9 301.2 889.1 269.6
Performance revenues | Total Reportable Segments | Global Segments        
Segment Reporting [Line Items]        
Performance revenues 286.0 61.7 662.6 676.6
Performance revenues related compensation expense 186.2 42.6 427.7 442.4
Net performance revenues 99.8 19.1 234.9 234.2
Principal investment income (loss)        
Segment Reporting [Line Items]        
Performance revenues 119.3 87.7 252.9 79.8
Principal investment income (loss) | Adjustments        
Segment Reporting [Line Items]        
Performance revenues (55.2) (38.2) (138.0) 33.2
Principal investment income (loss) | Total Reportable Segments | Global Segments        
Segment Reporting [Line Items]        
Performance revenues $ 64.1 $ 49.5 $ 114.9 $ 113.0