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Accrued Performance Fees - Performance Fees (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Performance fees $ 285.6 $ 214.7 $ 1,510.8 $ 570.8
Corporate Private Equity        
Segment Reporting Information [Line Items]        
Performance fees 159.6 186.5 1,147.4 283.0
Real Assets        
Segment Reporting Information [Line Items]        
Performance fees 74.5 (19.1) 214.0 198.6
Global Market Strategies        
Segment Reporting Information [Line Items]        
Performance fees 17.2 17.8 50.8 26.8
Investment Solutions        
Segment Reporting Information [Line Items]        
Performance fees $ 34.3 $ 29.5 $ 98.6 $ 62.4