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Employee benefit obligations - Average life expectancy (Details) | 12 Months Ended
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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

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- Definition The life expectancy, current provision used as a significant actuarial assumption to determine the present value of a defined benefit obligation. + References No definition available. + Details
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- Definition The life expectancy after retirement used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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