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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, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Investment income (loss) $ (83.9) $ 172.5
Performance revenues related compensation expense (72.8) 105.7
Net performance revenues (84.2) 55.1
Adjustments    
Segment Reporting Information [Line Items]    
Performance revenues related compensation expense 328.6 (10.1)
Net performance revenues 226.2 14.4
Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Performance revenues related compensation expense 255.8 95.6
Net performance revenues 142.0 69.5
Performance revenues    
Segment Reporting Information [Line Items]    
Investment income (loss) (157.0) 160.8
Performance revenues | Adjustments    
Segment Reporting Information [Line Items]    
Investment income (loss) 554.8 4.3
Performance revenues | Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Investment income (loss) 397.8 165.1
Principal investment income (loss)    
Segment Reporting Information [Line Items]    
Investment income (loss) 73.1 11.7
Principal investment income (loss) | Adjustments    
Segment Reporting Information [Line Items]    
Investment income (loss) (39.4) 12.1
Principal investment income (loss) | Total Reportable Segments | Global Segments    
Segment Reporting Information [Line Items]    
Investment income (loss) $ 33.7 $ 23.8