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PENSION AND POST-RETIREMENT BENEFITS - Weighted-average Assumptions Used to Determine Projected Benefit Obligation for Current Year (Details)
Dec. 31, 2017
Dec. 31, 2016
United States    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.47% 3.92%
Rate of future compensation increases 3.50% 3.50%
Foreign Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 2.19% 2.66%
Rate of future compensation increases 1.75% 2.20%