BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Deferred Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Realization of deferred revenue	$ 34.6	$ 0.0
Other Noncurrent Liabilities [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract with Customer, Liability, Noncurrent	25.7	38.5
Contract With Customer, Liability, Period Increase (Decrease)	(25.7)	0.0
Contract with Customer, Liability, Noncurrent	0.0	38.5
Other Current Liabilities [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract with Customer, Liability, Current	22.1	21.0
Contract With Customer, Liability, Period Increase (Decrease)	(21.8)	(2.9)
Contract with Customer, Liability, Current	$ 0.3	$ 18.1