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Financial instruments and risk management - Foreign currency sensitivity (Details) - Denominated in Mexican pesos - Foreign currency - Fair value - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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 $ (8,788) $ (10,436)
Effect on profit before tax from reasonably possible decrease in exchange rate $ 8,788 $ 10,436