BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Transaction Gains (Losses) Resulting from Remeasurement) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Foreign Currency Transaction Gain (Loss), before Tax	$ (2.7)	$ 0.8	$ 3.3
Transaction Gains and Losses Resulting from Remeasurement [Member]
Foreign Currency Transaction Gain (Loss), before Tax	11.4	(16.8)	16.3
Cash and Cash Equivalents [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(2.5)	(1.0)	1.5
Intercompany loan [Member]
Foreign Currency Transaction Gain (Loss), before Tax	$ 16.6	$ (16.6)	$ 11.5