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Intangible assets - Rates of amortization (Details)
12 Months Ended
Dec. 31, 2024
Trademarks and patents  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Amortisation rate, intangible assets other than goodwill 20.00%
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
Amortisation rate, intangible assets other than goodwill 20.00%
Goodwill [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill
Amortisation rate, intangible assets other than goodwill
Client portfolio  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 7 years
Amortisation rate, intangible assets other than goodwill 15.00%
Workforce  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill
Amortisation rate, intangible assets other than goodwill
Know-how  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Amortisation rate, intangible assets other than goodwill 20.00%
Non Compete  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Amortisation rate, intangible assets other than goodwill 20.00%