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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]      
Income before income taxes, Domestic $ 474.0 $ 514.8 $ 502.1
Income before income taxes, Foreign 364.0 326.0 323.5
Income before income taxes $ 838.0 $ 840.8 $ 825.6