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Pensions and other postretirement benefit plans - Schedule of Reconciliation of Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in plan assets      
Fair value of plan assets at beginning of period $ 1,785,367    
Actual return on plan assets     $ (381,700)
Fair value of plan assets at end of period 1,661,378 $ 1,785,367  
Pension benefits      
Change in benefit obligations      
Projected benefit obligation at beginning of period 1,658,045 1,642,180  
Service cost 998 1,366 1,754
Interest cost 81,500 84,449 71,733
Change in prior service cost 0 0  
Actuarial (gain) loss (101,025) 21,769  
Foreign currency translation (8,174) 33,973  
Benefits and expenses paid (127,368) (125,692)  
Curtailment 119 0  
Settlement 964 0  
Projected benefit obligation at end of period 1,503,131 1,658,045 1,642,180
Change in plan assets      
Fair value of plan assets at beginning of period 1,783,898 1,720,810  
Actual return on plan assets 5,620 150,371  
Employer contributions 7,949 1,441  
Settlement (964) 0  
Benefits paid (127,368) (125,692)  
Foreign currency translation (9,433) 36,968  
Fair value of plan assets at end of period 1,659,702 1,783,898 1,720,810
Reconciliation of funded status      
Funded status at end of period 156,571 125,853  
Unrecognized actuarial loss (gain) 76,547 90,813  
Unrecognized prior service cost 1,491 1,581  
Net prepaid (accrued) benefit cost 234,609 218,247  
Balance sheet presentation      
Other assets 160,343 131,881  
Accounts payable and accrued liabilities 277 282  
Pension and other postretirement benefit obligations 3,495 5,746  
Accumulated other comprehensive (loss) income (78,038) (92,394)  
Net prepaid (accrued) benefit cost 234,609 218,247  
Postretirement benefits      
Change in benefit obligations      
Projected benefit obligation at beginning of period 41,719 47,043  
Service cost 35 40 77
Interest cost 2,120 2,334 1,770
Change in prior service cost 0 (3,307)  
Actuarial (gain) loss (286) 109  
Foreign currency translation 0 0  
Benefits and expenses paid (4,581) (4,500)  
Curtailment 0 0  
Settlement 0 0  
Projected benefit obligation at end of period 39,007 41,719 47,043
Change in plan assets      
Fair value of plan assets at beginning of period 0 0  
Actual return on plan assets 0 0  
Employer contributions 4,581 4,500  
Settlement 0 0  
Benefits paid (4,581) (4,500)  
Foreign currency translation 0 0  
Fair value of plan assets at end of period 0 0 $ 0
Reconciliation of funded status      
Funded status at end of period (39,007) (41,719)  
Unrecognized actuarial loss (gain) (11,929) (13,555)  
Unrecognized prior service cost (2,169) (2,738)  
Net prepaid (accrued) benefit cost (53,105) (58,012)  
Balance sheet presentation      
Other assets 0 0  
Accounts payable and accrued liabilities 4,682 4,804  
Pension and other postretirement benefit obligations 34,325 36,915  
Accumulated other comprehensive (loss) income 14,098 16,293  
Net prepaid (accrued) benefit cost $ (53,105) $ (58,012)