RETIREMENT PLANS - Rate Assumptions (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension benefits
Weighted-average rates assumed in the actuarial calculations for the pension plan
Discount rate for benefit obligation (as percent)	2.90%	2.60%	4.20%
Discount rate for benefit cost (as percent)	2.60%	3.50%	4.50%
Annual salary increase (as a percent)			6.50%
Expected long-term return on plan assets (as a percent)	5.30%	5.10%	6.10%
Postretirement benefits
Weighted-average rates assumed in the actuarial calculations for the pension plan
Discount rate for benefit obligation (as percent)	2.80%	2.50%	3.50%
Discount rate for benefit cost (as percent)	2.50%	3.50%	4.50%
Postretirement benefits | Medical benefit plan
Health care cost trend rates
Trend rate	6.00%
Ultimate rate	4.00%
Postretirement benefits | Dental benefit plan
Health care cost trend rates
Trend rate	4.00%
Ultimate rate	4.00%