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Employee benefit obligations - Average life expectancy (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Germany    
Disclosure of defined benefit plans [line items]    
Life expectancy, current pensioners 23 years 22 years
Life expectancy, future pensioners 25 years 25 years
U.K    
Disclosure of defined benefit plans [line items]    
Life expectancy, current pensioners 21 years 22 years
Life expectancy, future pensioners 23 years 23 years
U.S.    
Disclosure of defined benefit plans [line items]    
Life expectancy, current pensioners 21 years 21 years
Life expectancy, future pensioners 23 years 22 years