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Pensions and other postretirement benefit plans - Schedule of Allocation of Plan Assets (Details) - Retirement Plans | Dec. 31, 2025 | Dec. 31, 2024
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Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target allocation | 100.00% |
Allocation of plan assets | 100.00% | 100.00%
Equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target allocation | 14.00% |
Allocation of plan assets | 10.00% | 21.00%
Debt securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target allocation | 69.00% |
Allocation of plan assets | 72.00% | 62.00%
Alternative investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target allocation | 17.00% |
Allocation of plan assets | 18.00% | 17.00%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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