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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, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Investment income $ 172.5 $ 1,029.8
Performance revenues related compensation expense 105.7 370.7
Net performance revenues 55.1 339.5
Adjustments    
Segment Reporting Information [Line Items]    
Performance revenues related compensation expense (10.1) (252.4)
Net performance revenues 14.4 (221.5)
Total Reportable Segments    
Segment Reporting Information [Line Items]    
Performance revenues related compensation expense 95.6 118.3
Net performance revenues 69.5 118.0
Performance allocations    
Segment Reporting Information [Line Items]    
Investment income 160.8 710.2
Performance allocations | Adjustments    
Segment Reporting Information [Line Items]    
Investment income 4.3 (473.9)
Performance allocations | Total Reportable Segments    
Segment Reporting Information [Line Items]    
Investment income 165.1 236.3
Principal investment income    
Segment Reporting Information [Line Items]    
Investment income 11.7 319.6
Principal investment income | Adjustments    
Segment Reporting Information [Line Items]    
Investment income 12.1 (293.3)
Principal investment income | Total Reportable Segments    
Segment Reporting Information [Line Items]    
Investment income $ 23.8 $ 26.3