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Investments - Schedule of Equity Method Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Equity method investments $ 1,157.7 $ 950.9
Operating Segments | Corporate Private Equity    
Schedule of Investments [Line Items]    
Equity method investments 370.3 282.4
Operating Segments | Real Assets    
Schedule of Investments [Line Items]    
Equity method investments 729.7 622.8
Operating Segments | Global Market Strategies    
Schedule of Investments [Line Items]    
Equity method investments 19.7 20.1
Operating Segments | Investment Solutions    
Schedule of Investments [Line Items]    
Equity method investments $ 38.0 $ 25.6