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Income Taxes - Components of Income Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ 29.1 $ 60.0 $ 55.8
Foreign 68.2 36.9 61.0
Income from continuing operations before income taxes and income from equity affiliates $ 97.3 $ 96.9 $ 116.8