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INCOME TAXES - Income (Loss) from Continuing Operations 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 $ 62.8 $ 45.6 $ 6.7
Foreign 0.1 (0.1) (0.2)
Income from continuing operations before income taxes $ 62.9 $ 45.5 $ 6.5