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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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