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Accrued Performance Fees - Components of Accrued Performance Fees (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Accrued performance fees $ 3,016.7 $ 2,481.1
Corporate Private Equity    
Segment Reporting Information [Line Items]    
Accrued performance fees 1,830.8 1,375.4
Real Assets    
Segment Reporting Information [Line Items]    
Accrued performance fees 528.0 483.4
Global Market Strategies    
Segment Reporting Information [Line Items]    
Accrued performance fees 83.3 68.6
Investment Solutions    
Segment Reporting Information [Line Items]    
Accrued performance fees $ 574.6 $ 553.7