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Analysis of cash flows - Share repurchases and buybacks (Detail) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Analysis of cash flows [Abstract]
Purchase of shares by employee benefit trust	£ (43.2)	£ (49.5)
Purchase of treasury shares	(637.3)	(248.1)
Share repurchases and buy-backs	£ (680.5)	£ (297.6)

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
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-URIDate 2022-03-24

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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.

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- Definition

Purchase of shares by employee benefit trust.

+ References

No definition available.

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