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Analysis of cash flows - Share repurchases and buybacks (Detail) - GBP (£) £ in Millions	6 Months Ended
	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)

X

- 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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Period Type:	duration

X

- Definition

Analysis of cash flows

+ References

No definition available.

+ Details

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X

- Definition

Payments for Shares Repurchased Into Treasury

+ References

No definition available.

+ Details

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X

- Definition

Purchase of shares by employee benefit trust.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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