EMPLOYEE BENEFIT PLANS - Assumptions Used in Calculations (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Assumptions used to determine benefit obligations at December 31:
Discount rate	3.06%	4.11%	3.48%
Rate of compensation increase	0.00%	0.00%	0.00%
Assumptions used to determine net periodic benefit cost for years ended December 31:
Discount rate (post-spin off), percent	4.11%	3.48%	4.01%
Expected long-term return on plan assets	5.72%	7.17%	7.17%
Rate of compensation increase	0.00%	0.00%	0.00%
Postretirement
Assumptions used to determine benefit obligations at December 31:
Discount rate	3.16%	4.18%	3.56%
Rate of compensation increase	4.50%	4.50%	4.50%
Assumptions used to determine net periodic benefit cost for years ended December 31:
Discount rate (post-spin off), percent	4.18%	3.56%	4.12%
Expected long-term return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	4.50%	4.50%	4.50%