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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Pension Plans with Projected Benefit Obligations Greater than Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Savings Plans Pension Plans And Other Postretirement Employee Benefits [Abstract] |  |
Projected benefit obligations | $ 350,091 | $ 474,237
Fair value of plan assets | $ 265,546 | $ 398,468

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- Definition Savings Plans, Pension Plans and Other Postretirement Employee Benefits [Abstract] + References No definition available. + Details
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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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