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Income Taxes - Components of Income Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 637.3 $ 756.5 $ 688.1
International 76.3 310.6 286.5
Total $ 713.6 $ 1,067.1 $ 974.6