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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 |

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