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Pensions and other postretirement benefit plans - Schedule of Components of Net Periodic Pension and Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension benefits        
Defined Benefit Plan Disclosure        
Service cost - benefits earned during the period $ 248 $ 288 $ 744 $ 866
Interest cost on benefit obligations 20,919 20,501 62,143 61,092
Expected return on plan assets (23,550) (24,356) (69,854) (72,509)
Amortization of prior service cost (benefit) 18 18 53 52
Amortization of actuarial loss (gain) 628 735 1,825 2,160
Total benefit, net (1,737) (2,814) (5,089) (8,339)
Postretirement benefits        
Defined Benefit Plan Disclosure        
Service cost - benefits earned during the period 8 9 24 26
Interest cost on benefit obligations 527 530 1,579 1,590
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (benefit) (143) (143) (427) (427)
Amortization of actuarial loss (gain) (419) (478) (1,256) (1,434)
Total benefit, net $ (27) $ (82) $ (80) $ (245)