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PENSION AND POST-RETIREMENT BENEFITS - Weighted-average Assumptions Used to Determine Projected Benefit Obligation for Current Year (Details)
Dec. 31, 2020
Dec. 31, 2019
UNITED STATES    
Defined Benefit Plan Disclosure [Line Items]    
Rate of future compensation increases (as a percent)   3.50%
UNITED STATES | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate (as a percent) 2.18% 3.01%
International Plans    
Defined Benefit Plan Disclosure [Line Items]    
Rate of future compensation increases (as a percent) 1.81% 2.02%
International Plans | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate (as a percent) 1.33% 1.81%