INCOME TAXES - Income (Loss) from Continuing Operations 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	$ 80.5	$ 65.8	$ 62.8
Foreign	3.5	0.3	0.1
Income from continuing operations before income taxes	$ 84.0	$ 66.1	$ 62.9