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Accrued Performance Fees - Performance Fees (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Performance fees $ 681.6 $ 145.2
Corporate Private Equity    
Segment Reporting Information [Line Items]    
Performance fees 568.0 27.5
Global Market Strategies    
Segment Reporting Information [Line Items]    
Performance fees 20.0 1.6
Real Assets    
Segment Reporting Information [Line Items]    
Performance fees 57.8 102.2
Investment Solutions    
Segment Reporting Information [Line Items]    
Performance fees $ 35.8 $ 13.9