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Income Taxes - Income (Loss) from Continuing Operations before Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
U.S. $ 100.6 $ 55.7 $ 57.7
Non-U.S. 11.0 5.3 (0.9)
Income before income taxes $ 111.6 $ 61.0 $ 56.8