PENSION AND POST-RETIREMENT BENEFITS - Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.47%	3.92%
Expected long-term return on plan assets	6.00%	6.50%
Rate of future compensation increases	3.50%	3.50%
International Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.19%	2.24%
Expected long-term return on plan assets	4.95%	4.81%
Rate of future compensation increases	1.75%	2.01%