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Income Taxes - Schedule of Income from Operations Before Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 234.2 $ 102.2 $ 146.4
Foreign (0.3) 0.3 1.0
Income from continuing operations before provision for income taxes $ 233.9 $ 102.5 $ 147.4