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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]      
United States $ 55.8 $ 42.6 $ 27.7
Foreign 61.0 58.9 65.7
Income from continuing operations before income taxes and income from equity affiliates $ 116.8 $ 101.5 $ 93.4