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Employee benefit obligations - Assumptions and sensitivities (Details) | Dec. 31, 2024 | Dec. 31, 2023
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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%

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- Definition The discount rate used as the 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 The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; 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 The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; 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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