NEW ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jan. 31, 2016	Mar. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
New accounting guidance, cumulative effect			$ (43.6)	$ 1.9	$ (29.3)
Accounting Standards Update 2016-16
New accounting guidance, cumulative effect		$ (43.6)
Revenue Standard Adoption
New accounting guidance, cumulative effect	$ (29.3)