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Pension and other post-retirement benefits - Benefit Obligations in Excess of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 413,041	$ 489,043
Fair value of plan assets	364,229	396,679
Projected benefit obligation	489,140	580,841
Fair value of plan assets	417,994	452,333
OPEB
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	198,463	274,649
Fair value of plan assets	139,368	162,592
Projected benefit obligation	198,463	274,649
Fair value of plan assets	$ 139,368	$ 162,592

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Amount of plan asset for defined benefit pension plan with projected 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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