PENSION AND POST-RETIREMENT BENEFITS - Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	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)	3.01%	4.13%
Expected long-term return on plan assets (as a percent)	5.50%	6.00%
International Plans
Defined Benefit Plan Disclosure [Line Items]
Rate of future compensation increases (as a percent)	2.02%	2.02%
International Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	1.81%	2.52%
Expected long-term return on plan assets (as a percent)	3.39%	4.86%