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Material accounting policies - Summary of amortization of intangible assets (Details)
 12 Months Ended
Dec. 31, 2025
Computer software [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Capitalised development expenditure [member] | Minimum [Member]  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Capitalised development expenditure [member] | Maximum [Member]  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 10 years
Other intangible assets [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Description of useful life, intangible assets other than goodwill contract periods