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Investments - Realized and Unrealized Gains (Losses) Earned from Investments of Consolidated Funds (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]    
Realized losses $ (2.1) $ (6.2)
Net change in unrealized gains (losses) 37.3 (61.6)
Total $ 35.2 $ (67.8)