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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
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%

X

- 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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X

- 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

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