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BENEFIT PLANS - WEIGHTED AVERAGE ASSUMPTIONS USED TO DETERMINE NET PERIODIC BENEFIT COST TREND RATES (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Interest crediting rate 1.30% 1.30% 1.50%
Discount rate 1.00% 1.80% 1.60%
Expected return on plan assets 2.30% 2.90% 2.90%
Rate of compensation increase 2.50% 2.50% 2.50%