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Investments - Schedule of Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]    
Equity method investments, excluding accrued performance fees $ 1,157.7 $ 950.9
Investments in CLOs and other 323.2 156.1
Total investments $ 1,480.9 $ 1,107.0