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Post-employment benefits - Summary of Sensitivity Analysis for Funded Plans (Details) - Funded - 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 0.25%  
Sensitivity analysis, basis point decrease 0.25%  
Increase of 25 basis points $ (464) $ (426)
Decrease of 25 basis points $ 500 467
Expected rates of salary increases    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Sensitivity analysis, basis point increase 0.25%  
Sensitivity analysis, basis point decrease 0.25%  
Increase of 25 basis points $ 91 110
Decrease of 25 basis points $ (98) (107)
Interest rate    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Sensitivity analysis, basis point increase 0.25%  
Sensitivity analysis, basis point decrease 0.25%  
Increase of 25 basis points $ 160 150
Decrease of 25 basis points $ (157) (146)
Inflation    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Sensitivity analysis, basis point increase 0.25%  
Sensitivity analysis, basis point decrease 0.25%  
Increase of 25 basis points $ 91 102
Decrease of 25 basis points $ (90) (99)
Life expectancy    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Sensitivity analysis, period increase 1 year  
Sensitivity analysis, period decrease 1 year  
Increase of 25 basis points $ 92 71
Decrease of 25 basis points $ (92) $ (71)