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Investments - Components of Investment Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment [Line Items]      
Investment income (loss) $ 809.2 $ 2,290.6 $ 875.9
Performance allocations - realized      
Investment [Line Items]      
Investment income (loss) 693.8 1,062.8 1,093.1
Performance allocations - unrealized      
Investment [Line Items]      
Investment income (loss) (70.9) 995.8 (377.7)
Performance allocations      
Investment [Line Items]      
Investment income (loss) 622.9 2,058.6 715.4
Principal investment income (loss) from equity method investments - realized      
Investment [Line Items]      
Investment income (loss) 122.9 68.1 110.4
Principal investment income (loss) from equity method investments - unrealized      
Investment [Line Items]      
Investment income (loss) 66.4 158.3 40.2
Principal investment income (loss) from equity method investments      
Investment [Line Items]      
Investment income (loss) 189.3 226.4 150.6
Principal investment income (loss) from investments in CLOs and other investments - realized      
Investment [Line Items]      
Investment income (loss) 1.5 2.3 2.2
Principal investment income (loss) from investments in CLOs and other investments- unrealized      
Investment [Line Items]      
Investment income (loss) (4.5) 3.3 7.4
Principal investment income (loss) from investments in CLOs and other investments      
Investment [Line Items]      
Investment income (loss) (3.0) 5.6 9.6
Other investment income - realized      
Investment [Line Items]      
Investment income (loss) $ 0.0 $ 0.0 $ 0.3