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EMPLOYEE BENEFIT PLANS - Major Assumptions Used in Determining the Benefit Obligation and Net Cost for Pension Plans (Details) - Pension Plan
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, assumptions used calculating benefit obligation, discount rate 1.40% 2.00%  
Defined benefit plan, assumptions used calculation net periodic benefit cost, discount rate 2.00% 2.80% 2.50%
Defined benefit plan, assumptions used calculating net periodic benefit cost, discount rate, interest cost 1.80% 2.70% 2.40%
Defined benefit plan, assumptions used calculating net periodic benefit cost, discount rate, service cost 1.80% 3.20% 2.80%
Defined benefit plan, assumptions used calculation benefit obligation, salary scale 2.80% 3.40%  
Defined benefit plan, assumptions used calculating net periodic benefit cost, salary scale 3.30% 3.00% 3.00%
Defined benefit plan, assumptions used calculating net periodic benefit cost, expected long-term rate of return on plan assets 4.90% 5.60% 6.00%