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Significant accounting policies - Estimated useful life of intangible assets (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Software (mostly development costs)    
Disclosure of detailed information about intangible assets [line items]    
Estimated useful lives (in years) 5 years 5 years
Capitalised software development costs | Minimum [Member]    
Disclosure of detailed information about intangible assets [line items]    
Estimated useful lives (in years) 5 years 5 years
Capitalised software development costs | Maximum [Member]    
Disclosure of detailed information about intangible assets [line items]    
Estimated useful lives (in years) 8 years 8 years