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Post-employment benefits - Summary of Sensitivity Analysis for Unfunded Plans (Details) - Unfunded - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Discount rates    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Sensitivity analysis, basis point increase 0.50%  
Sensitivity analysis, basis point decrease 0.50%  
Increase of 50 basis points $ (3) $ (2)
Decrease of 50 basis points $ 3 2
Expected rates of salary increases    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Sensitivity analysis, basis point increase 0.50%  
Sensitivity analysis, basis point decrease 0.50%  
Increase of 50 basis points $ 3 3
Decrease of 50 basis points $ (3) $ (2)