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Material accounting policies - Goodwill and intangible assets (Details)
12 Months Ended
Dec. 31, 2023
Software | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 3 years
Software | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 5 years
Customer contracts  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful life 10 years