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Investments - Schedule of Equity Method Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Equity method investments $ 1,009.6 $ 950.9
Operating Segments | Corporate Private Equity    
Schedule of Investments [Line Items]    
Equity method investments 305.8 282.4
Operating Segments | Real Assets    
Schedule of Investments [Line Items]    
Equity method investments 659.7 622.8
Operating Segments | Global Market Strategies    
Schedule of Investments [Line Items]    
Equity method investments 16.0 20.1
Operating Segments | Investment Solutions    
Schedule of Investments [Line Items]    
Equity method investments $ 28.1 $ 25.6