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Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details)

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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] Ìý Ìý Ìý
Labor Agreement, Contract Term 4 years Ìý Ìý
401(k) contribution match Ìý $ 0.60 Ìý
Defined Benefit Plan, Accumulated Benefit Obligation Ìý 1,010,000,000.0 $ 896,800,000
Reserve for investment commitments Ìý 37,100,000 Ìý
Early Termination Fees for Pension Benefits Ìý 14,900,000 Ìý
Early Termination Fees for Other Postretirement Benefits Ìý $ 3,000,000.0 Ìý
Structured Finance [Member] Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Redemption request notice period, days Ìý 90 days Ìý
Real Estate [Member] Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Redemption request notice period, days Ìý 45 days Ìý
Withdrawal request notice period, days Ìý 95 days Ìý
Pension Plan [Member] Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Participant contributions Ìý $ 0 0
Other Postretirement Benefits Plan [Member] Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Participant contributions Ìý 5,800,000 $ 5,600,000
Prior To Age65 [Member] Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Annual limit on medical coverage for each participant Ìý $ 7,000 Ìý