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Finance and operating leases - Supplemental balance sheet information (Details)	Dec. 31, 2022	Dec. 31, 2021
Weighted-average remaining lease term (in years):
Finance leases	1 year 10 months 24 days	2 years 6 months
Operating leases	10 years 2 months 12 days	8 years 3 months 18 days
Weighted-average discount rate:
Finance leases	3.53%	3.22%
Operating leases	4.64%	4.68%

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Weighted average discount rate for finance lease calculated at point in time.

+ References

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-Publisher FASB
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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

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