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Analysis of cash flows - Share repurchases and buybacks (Detail) - GBP (£) £ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Analysis of cash flows [Abstract] |  |
Purchase of shares by employee benefit trust | £ (37.0) | £ (43.2)
Purchase of treasury shares | 0.0 | (637.3)
Share repurchases and buy-backs | £ (37.0) | £ (680.5)

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- Definition The cash outflow to acquire or redeem entity's shares. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 17 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_17_b&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Analysis of cash flows + References No definition available. + Details
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- Definition Payments for Shares Repurchased Into Treasury + References No definition available. + Details
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- Definition Purchase of shares by employee benefit trust. + References No definition available. + Details
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