EMPLOYER SPONSORED BENEFIT PLANS - Assumptions Used in Determining the Year-End Benefit Obligation and Annual Net Cost (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Benefit Obligation
Discount rate (as a percent)	2.14%	3.37%
Expected return on plan assets (as a percent)	5.20%	5.06%
Net Cost
Discount rate (as a percent)	3.39%	3.88%	3.75%
Expected return on plan assets (as a percent)	5.20%	4.65%	5.79%