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BENEFIT PLANS - WEIGHTED AVERAGE ASSUMPTIONS USED TO DETERMINE NET PERIODIC BENEFIT COST TREND RATES (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Discount rate 1.80% 1.60% 1.60%
Expected return on plan assets 2.90% 2.90% 2.90%
Rate of compensation increase 2.50% 2.50% 2.60%