Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details)

v3.19.3.a.u2
PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
 12 Months Ended
Oct. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Labor Agreement, Contract Term 4 years    
401(k) contribution match   $ 0.60  
Defined Benefit Plan, Accumulated Benefit Obligation   1,010,000,000.0 $ 896,800,000
Reserve for investment commitments   37,100,000  
Early Termination Fees for Pension Benefits   14,900,000  
Early Termination Fees for Other Postretirement Benefits   $ 3,000,000.0  
Structured Finance [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Redemption request notice period, days   90 days  
Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Redemption request notice period, days   45 days  
Withdrawal request notice period, days   95 days  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Participant contributions   $ 0 0
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Participant contributions   5,800,000 $ 5,600,000
Prior To Age65 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Annual limit on medical coverage for each participant   $ 7,000