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Investments - Schedule of Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]    
Equity method investments, excluding accrued performance fees $ 1,009.6 $ 950.9
Investments in CLOs and other 159.4 156.1
Total investments $ 1,169.0 $ 1,107.0