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Interests in associates, joint ventures and other investments - Additional Information (Details) - GBP (£)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of principal associates and joint ventures [line items]
Interests in associates and joint ventures	£ 286,500,000	£ 305,100,000	£ 412,900,000
Kantar US
Disclosure of principal associates and joint ventures [line items]
Cumulative share of unrecognised losses	137,900,000	29,500,000
ROW Chain
Disclosure of principal associates and joint ventures [line items]
Cumulative share of unrecognised losses	30,100,000	33,800,000
Kantar
Disclosure of principal associates and joint ventures [line items]
Interests in associates and joint ventures	0	0	61,200,000
Imagina Spain
Disclosure of principal associates and joint ventures [line items]
Cumulative share of unrecognised losses			23,000,000.0
Market value of equity interests			£ 0
Associates and Other Investments
Disclosure of principal associates and joint ventures [line items]
Capital commitments contracted	£ 2,200,000	£ 3,200,000

X

- Definition

The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments]

+ References

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- Definition

The cumulative amount of the unrecognised share of losses of associates if the entity has stopped recognising its share of losses when applying the equity method. [Refer: Associates [member]; Unrecognised share of losses of associates]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph 22
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_22_c&doctype=Standard
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- Definition

The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates reported in separate financial statements]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph 21
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_21_b_iii&doctype=Standard
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- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-URIDate 2023-03-23

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Disclosure of principal associates and joint ventures.

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