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PENSION AND POSTRETIREMENT BENEFIT PLANS - Assumptions (Details)
2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits        
Benefit Obligation Assumptions        
Discount rate 2.42% 2.70% 2.42% 3.16%
Rate of compensation increase 4.00% 4.00% 4.00% 4.00%
Net Periodic Benefit Cost Assumptions        
Discount rate 2.70% 3.16%   4.22%
Assumed long-term rate of return on assets 5.42% 5.42%   6.50%
Rate of compensation increase 4.00% 4.00%   4.00%
Postretirement Benefits        
Benefit Obligation Assumptions        
Discount rate 2.92% 3.11% 2.92% 3.48%
Net Periodic Benefit Cost Assumptions        
Discount rate 3.11% 3.48%   4.57%
Assumed health care cost trend rates        
U.S. Consumer Price Index (CPI) increase     2.06% 1.86%
Postretirement Benefits | Union employees        
Assumed health care cost trend rates        
Projected healthcare cost rate in 2028     4.50%  
Projected ultimate health care cost trend rates after 2028     4.50%  
Postretirement Benefits | Union employees | Minimum        
Assumed health care cost trend rates        
Projected healthcare cost rate in 2020 6.50%   6.50%  
Postretirement Benefits | Union employees | Maximum        
Assumed health care cost trend rates        
Projected healthcare cost rate in 2020 7.00%   7.00%