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Employee benefit plans - Weighted-Average Asset Allocations (Details) | Dec. 31, 2021 | Dec. 31, 2020
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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 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. + Details
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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 + Details
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