Pensions and other postretirement benefit plans - Schedule of Estimated Benefit Payments (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Pension benefits
Defined Benefit Plans and Other Postretirement Benefit Plans
2025	$ 134,982
2026	133,856
2027	133,474
2028	130,646
2029	128,982
Thereafter	554,288
Postretirement benefits
Defined Benefit Plans and Other Postretirement Benefit Plans
2025	4,815
2026	4,536
2027	4,269
2028	4,010
2029	3,764
Thereafter	$ 15,549

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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