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EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS - Net Periodic Pension Cost Assumptions (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assumptions used in the determination of the net periodic pension cost:      
Discount rate 1.80% 2.70% 2.80%
Expected long-term return on plan assets 3.70% 4.60% 4.80%