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Pensions and Other Postretirement Benefits - Benefit Assumptions (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Return on assets in plans | 8.00% |  |
Funded Plan | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.23% | 5.56% | 2.97%
Future salary increases | 4.44% | 4.44% | 4.44%
Funded Plan | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.11% | 5.45% | 2.72%
Unfunded Plan | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Future salary increases | 4.44% | 4.44% | 4.44%
Discount rate - service cost | 5.75% | 3.25% | 3.14%
Discount rate - interest cost | 5.40% | 2.45% | 1.95%
Return on assets in plans | 8.00% | 8.00% | 8.00%
Unfunded Plan | Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate - service cost | 5.56% | 3.01% | 2.71%
Discount rate - interest cost | 5.23% | 2.13% | 1.57%
Return on assets in plans | 7.75% | 7.75% | 7.75%
Health care trend rate | 7.00% | 6.50% | 6.00%

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- Definition Defined Benefit Plan Assumed Health Care Cost Trend Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate For Interest Cost + References No definition available. + Details
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- Definition Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate For Service Cost + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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