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Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Performance revenues $ 159.8 $ (83.9)
Performance revenues related compensation expense 171.4 (72.8)
Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Net performance revenues   142.0
Performance revenues    
Segment Reporting Information [Line Items]    
Performance revenues 222.9 (157.0)
Performance revenues related compensation expense 171.4 (72.8)
Net performance revenues 51.5 (84.2)
Performance revenues | Adjustments    
Segment Reporting Information [Line Items]    
Performance revenues 132.2 554.8
Performance revenues related compensation expense 56.3 328.6
Net performance revenues 75.9 226.2
Performance revenues | Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Performance revenues 355.1 397.8
Performance revenues related compensation expense 227.7 255.8
Net performance revenues 127.4 142.0
Principal investment income (loss)    
Segment Reporting Information [Line Items]    
Performance revenues (63.1) 73.1
Principal investment income (loss) | Adjustments    
Segment Reporting Information [Line Items]    
Performance revenues 93.1 (39.4)
Principal investment income (loss) | Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Performance revenues $ 30.0 $ 33.7