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Accrued Performance Fees - Components of Accrued Giveback Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Accrued giveback obligations $ (161.2) $ (160.8)
Corporate Private Equity    
Segment Reporting Information [Line Items]    
Accrued giveback obligations (4.1) (3.9)
Real Assets    
Segment Reporting Information [Line Items]    
Accrued giveback obligations $ (157.1) $ (156.9)