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Retirement benefit obligations - Assumptions Used for RIPS (Details) - UK RIPS - Weighted average | Feb. 24, 2022 | Dec. 31, 2021
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Disclosure of defined benefit plans |  |
Discount rate (as a percent) | 2.60% | 2.00%
Future pension increases (as a percent) | 3.60% | 3.30%
RPI inflation (as a percent) | 3.70% | 3.40%
CPI inflation (as a percent) | 3.00% | 2.70%

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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 [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + 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 [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_144&doctype=Standard -URIDate 2023-03-23 + 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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- Definition The expected rate of Consumer Price Index inflation that is 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 expected rate of Retail Price Index inflation that is 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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