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Employee benefit plans - Schedule of Pension Plan Weighted-Average Asset Allocations (Details) - Pension Benefits	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure
Weighted-average asset allocations	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure
Weighted-average asset allocations	1.40%	4.40%
Equity securities
Defined Benefit Plan Disclosure
Weighted-average asset allocations	50.90%	63.30%
Corporate bonds
Defined Benefit Plan Disclosure
Weighted-average asset allocations	29.00%	18.10%
U.S. government securities
Defined Benefit Plan Disclosure
Weighted-average asset allocations	18.70%	14.20%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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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

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