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Financial instruments and risk management - Foreign currency sensitivity (Details) - Foreign currency - Fair value - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
USD |  |  |
Financial instruments and risk management |  |  |
Percentage of reasonably possible increase in exchange rate |  |  | 5.00%
Percentage of reasonably possible decrease in exchange rate |  |  | (5.00%)
Effect on profit before tax from reasonably possible increase in exchange rate |  | $ (80,919) |
Effect on profit before tax from reasonably possible decrease in exchange rate |  | $ 80,919 |
Denominated in Mexican pesos |  |  |
Financial instruments and risk management |  |  |
Percentage of reasonably possible increase in exchange rate | 5.00% | 5.00% |
Percentage of reasonably possible decrease in exchange rate | (5.00%) | (5.00%) |
Effect on profit before tax from reasonably possible increase in exchange rate | $ (10,436) | $ (18,528) |
Effect on profit before tax from reasonably possible decrease in exchange rate | $ 10,436 | $ 18,528 |

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