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Investments - Interest and Other Income 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]        
Interest income from investments $ 41.8 $ 40.0 $ 124.1 $ 101.6
Other income 2.9 3.0 8.5 6.2
Total $ 44.7 $ 43.0 $ 132.6 $ 107.8