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Employee benefit obligations - Assumptions and sensitivities (Details)
Dec. 31, 2024
Dec. 31, 2023
Germany    
Disclosure of defined benefit plans [line items]    
Rates of inflation 2.00% 2.00%
Rates of increase in salaries 3.00% 3.20%
Discount rates 3.57% 3.45%
U.K    
Disclosure of defined benefit plans [line items]    
Rates of inflation 3.00% 2.95%
Rates of increase in salaries 2.60% 2.50%
Discount rates 5.55% 4.80%
U.S.    
Disclosure of defined benefit plans [line items]    
Rates of inflation 2.20% 2.20%
Rates of increase in salaries 3.00% 3.00%
Discount rates 5.87% 5.37%