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Employee benefits - Accumulated benefit obligation in excess of plan assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 851,471	$ 914,353
Accumulated benefit obligation	851,471	914,353
Fair value of plan assets	860,484	878,785
OPEB Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	159,958	179,210
Accumulated benefit obligation	159,958	179,210
Fair value of plan assets	$ 0	$ 0

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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+ References

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