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Pension benefits - Weighted-Average Asset Allocation of Funds Related to Defined Benefit Plan (Details)	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation of funds related to defined benefit plan (as percent)	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation of funds related to defined benefit plan (as percent)	7.20%	13.60%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation of funds related to defined benefit plan (as percent)	68.20%	58.40%
Real estate
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation of funds related to defined benefit plan (as percent)	13.60%	11.00%
Money market
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation of funds related to defined benefit plan (as percent)	10.60%	16.50%
Other
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocation of funds related to defined benefit plan (as percent)	0.40%	0.50%

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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