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Employee benefit plans - Schedule of Pension Plan Weighted-Average Asset Allocations (Details) - Pension Benefits | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 100.00% | 100.00%
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 4.80% | 6.80%
Equity securities |  |
Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 67.40% | 63.30%
Corporate Debt Securities |  |
Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 19.60% | 20.70%
U.S. Treasuries and Government agencies |  |
Defined Benefit Plan Disclosure |  |
Weighted-average asset allocations | 8.20% | 9.20%

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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