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Accrued Performance Fees - Components of Accrued Performance Fees (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Accrued performance fees $ 3,498.6 $ 2,481.1
Corporate Private Equity    
Segment Reporting Information [Line Items]    
Accrued performance fees 2,130.9 1,375.4
Real Assets    
Segment Reporting Information [Line Items]    
Accrued performance fees 624.3 483.4
Global Market Strategies    
Segment Reporting Information [Line Items]    
Accrued performance fees 84.9 68.6
Investment Solutions    
Segment Reporting Information [Line Items]    
Accrued performance fees $ 658.5 $ 553.7