PENSION AND OTHER POSTRETIREMENT BENEFITS - Assumptions Used (Details)	Dec. 31, 2017	Dec. 31, 2016
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.50%	3.74%
Domestic | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.50%	3.75%
Foreign | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.30%	3.54%
Rate of compensation increase	3.02%	3.02%