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Summary of Significant Accounting Policies - Investments in Unconsolidated Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Investments $ 1,169.0 $ 1,107.0
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Investments 706.0 664.2
Due from affiliates, net 0.1 1.8
Maximum Exposure to Loss 706.1 $ 666.0
Amount of variable interests in unconsolidated VIEs related to performance fees 38.0  
Amount of variable interests in unconsolidated VIEs related to management fees $ 22.7