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Investments - Realized and Unrealized Gains (Losses) Earned from Investments of Consolidated Funds (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]        
Realized losses $ (3.3) $ 0.0 $ (9.1) $ (9.6)
Net change in unrealized gains 0.8 18.6 36.2 54.6
Total $ (2.5) $ 18.6 $ 27.1 $ 45.0