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Earnings/(loss) from associates - after interest and tax (Details) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Disclosure of associates [line items]
(Earnings)/loss from associates - after interest and tax	£ 1.0	£ (63.8)
Restructuring and transformation costs	£ 86.8	81.2
Kantar
Disclosure of associates [line items]
Amortisation and impairment of acquired intangible assets other than goodwill		46.7
Restructuring and transformation costs		£ 24.8

X

- 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.

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- Definition

The amount of expense relating to restructuring. Restructuring is a programme that is planned and controlled by management and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. Such programmes include: (a) the sale or termination of a line of business; (b) closure of business locations in a country or region or the relocation of activities from one country or region to another; (c) changes in management structure; and (d) fundamental reorganisations that have a material effect on the nature and focus of the entity's operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 98
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- Definition

The entity's share of the profit (loss) of associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2022-03-24
-Paragraph 85
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- Definition

Amortisation and impairment of acquired intangible assets other than goodwill.

+ References

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