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Pension and other post-employment benefits - Schedule of Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Change in plan assets    
Non-current assets (note 11) $ 84,490 $ 48,477
Pension benefits    
Change in projected benefit obligation    
Projected benefit obligation, beginning of year 647,092 627,668
Plan settlements 0 (3,226)
Service cost 13,625 11,725
Interest cost 33,260 33,633
Actuarial loss (gain) (32,568) 20,085
Contributions from retirees 0 0
Medicare Part D 0 0
Benefits paid (45,343) (42,740)
Foreign exchange (100) (53)
Projected benefit obligation, end of year 615,966 647,092
Change in plan assets    
Fair value of plan assets, beginning of year 610,209 568,982
Actual return on plan assets 33,371 65,235
Employer contributions 22,600 21,956
Plan settlements (98) (3,226)
Contributions from retirees 0 0
Medicare Part D subsidy receipts 0 0
Benefits paid (45,343) (42,740)
Foreign exchange 0 2
Fair value of plan assets, end of year 620,739 610,209
Funded (unfunded) status 4,773 (36,883)
Non-current assets (note 11) 32,608 12,598
Current liabilities (1,647) (1,416)
Non-current liabilities (26,188) (48,065)
Net amount recognized   (36,883)
Net amount recognized 4,773  
OPEB    
Change in projected benefit obligation    
Projected benefit obligation, beginning of year 209,498 217,330
Plan settlements 0 0
Service cost 2,901 3,253
Interest cost 11,052 11,510
Actuarial loss (gain) (11,106) (10,913)
Contributions from retirees 2,018 2,189
Medicare Part D 314 355
Benefits paid (13,596) (14,226)
Foreign exchange 0 0
Projected benefit obligation, end of year 201,081 209,498
Change in plan assets    
Fair value of plan assets, beginning of year 193,782 172,167
Actual return on plan assets 16,379 22,620
Employer contributions 2,801 10,677
Plan settlements 0 0
Contributions from retirees 2,018 2,189
Medicare Part D subsidy receipts 314 355
Benefits paid (13,596) (14,226)
Foreign exchange 0 0
Fair value of plan assets, end of year 201,698 193,782
Funded (unfunded) status 617 (15,716)
Non-current assets (note 11) 51,882 35,879
Current liabilities (3,896) (3,164)
Non-current liabilities (47,369) (48,431)
Net amount recognized   $ (15,716)
Net amount recognized $ 617