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Selected accounting policies - Schedule of useful lives of intangible assets (Details)
 12 Months Ended
Dec. 31, 2023
Currently marketed products | Bottom of range  
Disclosure of detailed information about intangible assets [line items]  
Finite-lived intangible asset, useful life (in years) 5 years
Currently marketed products | Top of range  
Disclosure of detailed information about intangible assets [line items]  
Finite-lived intangible asset, useful life (in years) 20 years
Marketing know-how  
Disclosure of detailed information about intangible assets [line items]  
Finite-lived intangible asset, useful life (in years) 25 years
Technologies | Bottom of range  
Disclosure of detailed information about intangible assets [line items]  
Finite-lived intangible asset, useful life (in years) 10 years
Technologies | Top of range  
Disclosure of detailed information about intangible assets [line items]  
Finite-lived intangible asset, useful life (in years) 20 years
Other (including software) | Bottom of range  
Disclosure of detailed information about intangible assets [line items]  
Finite-lived intangible asset, useful life (in years) 3 years
Other (including software) | Top of range  
Disclosure of detailed information about intangible assets [line items]  
Finite-lived intangible asset, useful life (in years) 10 years