INCOME TAXES - Interest Expense and Accrued Interest Payable on Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Other Interest Expense/(Income)	$ 0.0	$ (0.2)	$ 0.1
Accrued Interest Expense	$ 1.8	$ 1.8