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Investments - Components of Accrued Giveback Obligations (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Accrued giveback obligations $ (17.5) $ (22.2)
Corporate Private Equity    
Segment Reporting Information [Line Items]    
Accrued giveback obligations (0.6) (5.0)
Real Assets    
Segment Reporting Information [Line Items]    
Accrued giveback obligations $ (16.9) $ (17.2)