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Employee benefit plans - Weighted-Average Asset Allocations (Details)	Dec. 31, 2024	Dec. 31, 2023
Retirement Plans | U.S.
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Retirement Plans | U.S. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	19.50%	22.20%
Retirement Plans | U.S. | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total	78.00%	76.60%
Retirement Plans | U.S. | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total	2.50%	1.20%
Retirement Plans | RTS
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Retirement Plans | RTS | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	22.20%	18.60%
Retirement Plans | RTS | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total	77.80%	81.20%
Retirement Plans | RTS | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total	0.00%	0.20%
Retirement Plans | U.K.
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Retirement Plans | U.K. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	21.00%	20.00%
Retirement Plans | U.K. | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total	77.10%	79.10%
Retirement Plans | U.K. | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total	1.90%	0.90%
Retirement Plans | Canada
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Retirement Plans | Canada | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	31.40%	29.40%
Retirement Plans | Canada | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total	68.60%	70.60%
Retirement Plans | Canada | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total	0.00%	0.00%
Retiree Health and Life Insurance Plans
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Retiree Health and Life Insurance Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	0.00%	0.00%
Retiree Health and Life Insurance Plans | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Retiree Health and Life Insurance Plans | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total	0.00%	0.00%

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- Definition

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

No definition available.

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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

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