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Income Taxes Income Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. income (loss) $ (37.1) $ 90.0 $ 88.3
Non - U.S. income 377.1 209.0 184.4
Income before income taxes $ 340.0 $ 299.0 $ 272.7