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Pensions and Other Post-retirement Benefits - Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assumptions used to determine benefit obligations, average discount rate | 5.35% | 4.75%
Assumptions used to determine benefit obligations, rate of compensation increase | 2.96% | 3.78%
Assumptions used to determine net periodic benefit cost, average discount rate, service cost | 5.02% | 5.23%
Assumptions used to determine net periodic benefit cost, average discount rate, interest cost | 4.64% | 4.91%
Assumptions used to determine net periodic benefit cost, expected return on plan assets | 7.23% | 6.86%
Assumptions used to determine net periodic benefit cost, rate of compensation increase | 3.78% | 4.61%
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assumptions used to determine benefit obligations, average discount rate | 5.49% | 4.88%
Assumptions used to determine benefit obligations, rate of compensation increase | 3.00% | 3.00%
Assumptions used to determine net periodic benefit cost, average discount rate, service cost | 4.96% | 5.15%
Assumptions used to determine net periodic benefit cost, average discount rate, interest cost | 4.85% | 5.09%
Assumptions used to determine net periodic benefit cost, expected return on plan assets | 0.00% | 0.00%
Assumptions used to determine net periodic benefit cost, rate of compensation increase | 3.00% | 3.00%

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- Definition Defined Benefit Plan, Assumption Used Calculating Net Periodic Benefit Cost, Discount Rate, 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 increase of compensation, used to determine benefit obligation 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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- Definition Weighted average rate for present value of future retirement benefits cash flows, 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 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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