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Employee benefit plans - Schedule of Pension Plan Weighted-Average Asset Allocations (Details) - Pension Benefits | Dec. 31, 2023 | Dec. 31, 2022
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Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 100.00% | 100.00%
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 4.40% | 4.70%
Equity securities |  |
Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 63.30% | 60.30%
Corporate bonds |  |
Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 18.10% | 19.50%
U.S. government securities |  |
Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 14.20% | 15.50%

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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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