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Investments - Schedule of Income (Loss) from Equity-Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Investments [Line Items]        
Income from equity investments $ 35.9 $ 65.9 $ 140.2 $ 116.3
Operating Segments | Corporate Private Equity        
Schedule of Investments [Line Items]        
Income from equity investments 8.8 13.5 38.4 32.0
Operating Segments | Real Assets        
Schedule of Investments [Line Items]        
Income from equity investments 24.1 52.5 95.7 89.9
Operating Segments | Global Market Strategies        
Schedule of Investments [Line Items]        
Income from equity investments 0.0 (0.5) 0.6 (5.5)
Operating Segments | Investment Solutions        
Schedule of Investments [Line Items]        
Income from equity investments $ 3.0 $ 0.4 $ 5.5 $ (0.1)