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Retirement plans - Schedule of Pension Costs (Income) (Details) - Retirement Plans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation	$ 5,444	$ 5,686	$ 16,332	$ 17,058
Expected return on plan assets	(5,179)	(5,517)	(15,539)	(16,550)
Amortization of prior service cost (credit)	(59)	23	(176)	68
Amortization of actuarial loss	1,478	1,475	4,433	4,425
Expense for company-sponsored retirement plans	$ 1,684	$ 1,667	$ 5,050	$ 5,001

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