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Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Investment income $ 1,029.8 $ 1,965.2
Performance revenues related compensation expense 370.7 866.6
Net performance revenues 339.5 919.5
Adjustments    
Segment Reporting Information [Line Items]    
Performance revenues related compensation expense (252.4) (774.2)
Net performance revenues (221.5) (843.5)
Total Reportable Segments    
Segment Reporting Information [Line Items]    
Performance revenues related compensation expense 118.3 92.4
Net performance revenues 118.0 76.0
Performance allocations    
Segment Reporting Information [Line Items]    
Investment income 710.2 1,786.1
Performance allocations | Adjustments    
Segment Reporting Information [Line Items]    
Investment income (473.9) (1,617.7)
Performance allocations | Total Reportable Segments    
Segment Reporting Information [Line Items]    
Investment income 236.3 168.4
Principal investment income    
Segment Reporting Information [Line Items]    
Investment income 319.6 179.1
Principal investment income | Adjustments    
Segment Reporting Information [Line Items]    
Investment income (293.3) (149.1)
Principal investment income | Total Reportable Segments    
Segment Reporting Information [Line Items]    
Investment income $ 26.3 $ 30.0