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Goodwill and acquisitions (Detail) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Goodwill and acquisitions [Abstract]
(Decrease) increase in goodwill	£ (156.6)
Goodwill foreign currency translation difference	320.8
Goodwill impairment	52.9	£ 0.0
Additional recognition, goodwill	£ 217.1

X

- Definition

The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2022-03-24
-Paragraph B67
-Subparagraph d
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B67_d_ii&doctype=Appendix&subtype=B
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The increase (decrease) in goodwill. [Refer: Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2022-03-24
-Paragraph B67
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B
-URIDate 2022-03-24

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Period Type:	duration

X

- Definition

The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2022-03-24
-Paragraph B67
-Subparagraph d
-Clause v
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B
-URIDate 2022-03-24

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X

- Definition

The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2022-03-24
-Paragraph B67
-Subparagraph d
-Clause vi
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B67_d_vi&doctype=Appendix&subtype=B
-URIDate 2022-03-24

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X

- Definition

Goodwill and acquisitions

+ References

No definition available.

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