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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Change in plan assets      
Fair value of plan assets at beginning of period $ 1,661,378    
Fair value of plan assets at end of period 1,495,213 $ 1,661,378  
Pension benefits      
Change in benefit obligations      
Projected benefit obligation at beginning of period 1,503,131 1,658,045  
Service cost 860 998 $ 1,366
Interest cost 80,834 81,500 84,449
Actuarial loss (gain) 23,908 (101,025)  
Foreign currency translation 41,031 (8,174)  
Benefits paid (115,042) (127,368)  
Curtailment 0 119  
Settlement (212,186) (964)  
Projected benefit obligation at end of period 1,322,536 1,503,131 1,658,045
Change in plan assets      
Fair value of plan assets at beginning of period 1,659,702 1,783,898  
Actual return on plan assets 112,229 5,620  
Employer contributions 1,691 7,949  
Settlement (212,186) (964)  
Benefits paid (115,042) (127,368)  
Foreign currency translation 47,294 (9,433)  
Fair value of plan assets at end of period 1,493,688 1,659,702 1,783,898
Balance sheet presentation      
Other assets 173,362 160,343  
Accounts payable and accrued liabilities 271 277  
Pension and other postretirement benefit obligations 1,939 3,495  
Funded status at end of period 171,152 156,571  
Reconciliation of funded status      
Funded status at end of period 171,152 156,571  
Unrecognized actuarial loss (gain) 98,955 76,547  
Unrecognized prior service cost (benefit) 1,529 1,491  
Net prepaid (accrued) benefit cost (271,636) (234,609)  
Postretirement benefits      
Change in benefit obligations      
Projected benefit obligation at beginning of period 39,007 41,719  
Service cost 32 35 40
Interest cost 2,104 2,120 2,334
Actuarial loss (gain) (793) (286)  
Foreign currency translation 0 0  
Benefits paid (3,758) (4,581)  
Curtailment 0 0  
Settlement 0 0  
Projected benefit obligation at end of period 36,592 39,007 41,719
Change in plan assets      
Fair value of plan assets at beginning of period 0 0  
Actual return on plan assets 0 0  
Employer contributions 3,758 4,581  
Settlement 0 0  
Benefits paid (3,758) (4,581)  
Foreign currency translation 0 0  
Fair value of plan assets at end of period 0 0 $ 0
Balance sheet presentation      
Other assets 0 0  
Accounts payable and accrued liabilities 4,361 4,682  
Pension and other postretirement benefit obligations 32,231 34,325  
Funded status at end of period (36,592) (39,007)  
Reconciliation of funded status      
Funded status at end of period (36,592) (39,007)  
Unrecognized actuarial loss (gain) (11,049) (11,929)  
Unrecognized prior service cost (benefit) (1,599) (2,169)  
Net prepaid (accrued) benefit cost $ 49,240 $ 53,105