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Investments - Schedule of Income (Loss) from Equity-Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Schedule of Investments [Line Items]    
Income (loss) from equity-method investments $ 45.4 $ (6.4)
Operating Segments | Corporate Private Equity    
Schedule of Investments [Line Items]    
Income (loss) from equity-method investments 7.6 (2.3)
Operating Segments | Real Assets    
Schedule of Investments [Line Items]    
Income (loss) from equity-method investments 35.0 1.8
Operating Segments | Global Market Strategies    
Schedule of Investments [Line Items]    
Income (loss) from equity-method investments 1.3 (4.9)
Operating Segments | Investment Solutions    
Schedule of Investments [Line Items]    
Income (loss) from equity-method investments $ 1.5 $ (1.0)