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Employee benefit plans - Weighted-Average Asset Allocations (Details)	Dec. 31, 2021	Dec. 31, 2020
United States
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	100.00%	100.00%
U.K.
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	100.00%	100.00%
Canada
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	100.00%	100.00%
Retirement Plans | United States | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	23.50%	0.60%
Retirement Plans | United States | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	72.00%	92.20%
Retirement Plans | United States | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	4.50%	7.20%
Retirement Plans | U.K. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	32.80%	41.40%
Retirement Plans | U.K. | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	66.60%	58.10%
Retirement Plans | U.K. | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	0.60%	0.50%
Retirement Plans | Canada | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	33.60%	34.80%
Retirement Plans | Canada | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	66.40%	55.40%
Retirement Plans | Canada | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	0.00%	9.80%
Retiree Health and Life Insurance Plans
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	100.00%	100.00%
Retiree Health and Life Insurance Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	0.00%	0.00%
Retiree Health and Life Insurance Plans | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	100.00%	100.00%
Retiree Health and Life Insurance Plans | Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Total (percent)	0.00%	0.00%

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- Definition

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+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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