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Pension and other post-employment benefits - Schedule of Fair Value of Investments by Asset Category (Details) - Level 1 $ in Thousands	Dec. 31, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan amount	$ 822,837
Defined benefit plan, percentage	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan amount	$ 396,341
Defined benefit plan, percentage	48.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan amount	$ 377,755
Defined benefit plan, percentage	46.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan amount	$ 48,741
Defined benefit plan, percentage	6.00%

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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.

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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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