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Material accounting policies - Schedule of Intangible Assets with Indefinite Useful Life (Details)
 12 Months Ended
Dec. 31, 2023
Acquired patents, know-how and in-process research & development | Bottom of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 5 years
Acquired patents, know-how and in-process research & development | Top of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 20 years
ERP management reporting software system | Bottom of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 5 years
ERP management reporting software system | Top of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 10 years
Acquired customer contracts and relationships | Bottom of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 7 years
Acquired customer contracts and relationships | Top of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 10 years
Acquired non-compete agreements | Bottom of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 1 year
Acquired non-compete agreements | Top of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 3 years
Domain names  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 15 years
Acquired trademarks and service marks  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 15 years
Internally generated fuel cell intangible assets | Bottom of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 3 years
Internally generated fuel cell intangible assets | Top of range  
Disclosure of joint ventures [line items]  
Estimated useful life (in years) 5 years