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EMPLOYEE RETIREMENT PLANS - Assumptions - Tabular Disclosure (Details) - Defined-benefit pension plans
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assumptions      
Discount rate for obligations 1.70% 2.50% 3.80%
Expected return on plan assets 2.00% 3.00% 7.00%
Rate of compensation increase 0.00% 0.00% 0.00%
Discount rate for net periodic pension cost 2.50% 3.80% 3.30%