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Investments - Interest and Other Income of Consolidated Funds (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]    
Interest income from investments $ 40.5 $ 27.7
Other income 2.4 1.2
Total $ 42.9 $ 28.9