PENSION AND POST-RETIREMENT BENEFITS - Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.92%	4.15%	3.89%
Expected long-term return on plan assets	6.50%	7.00%	7.50%
Rate of future compensation increases	3.50%	3.50%	3.50%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.24%	3.68%	3.74%
Expected long-term return on plan assets	4.81%	6.00%	6.00%
Rate of future compensation increases	2.01%	2.22%	2.33%