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Pension and other post-retirement benefits - Fair Value of Investments by Asset Category (Details) - Level 1 $ in Thousands	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2021	$ 841,240
Percentage	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
2021	$ 429,147
Percentage	51.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
2021	$ 350,834
Percentage	42.00%
Other
Defined Benefit Plan Disclosure [Line Items]
2021	$ 61,259
Percentage	7.00%

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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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.

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