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Employee benefit obligations - Weighted Average Assumptions Used For Actuarial Valuations (Details) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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United Kingdom |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 5.20% | 4.70% | 5.10%
Rate of increase in pensions in payment | 2.60% | 2.50% | 4.40%
Inflation | 3.20% | 3.10% | 3.00%
North America |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 5.40% | 4.90% | 5.20%
Western Continental Europe |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 3.30% | 3.40% | 4.10%
Rate of increase in salaries | 2.50% | 2.50% | 2.50%
Rate of increase in pensions in payment | 2.00% | 2.00% | 2.00%
Inflation | 2.00% | 2.00% | 2.00%
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Discount rate | 6.40% | 6.50% | 6.40%
Rate of increase in salaries | 6.20% | 6.20% | 5.70%
Inflation | 2.90% | 3.40% | 3.40%

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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 increases in pension 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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- 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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