BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Trade Receivables and Credit Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 0.2	$ 0.1
Bad debt expense	$ 0.5	$ 0.6	$ 0.7