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Related party transactions - Additional Information (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Associates | Kantar
Disclosure of transactions between related parties [line items]
Revenue from sale of goods, related party transactions	£ 20.9	£ 42.7
United States | Compas
Disclosure of transactions between related parties [line items]
Revenue from sale of goods, related party transactions	£ 233.0	159.7
United States | Compas | Previously Reported
Disclosure of transactions between related parties [line items]
Revenue from sale of goods, related party transactions		£ 88.3

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.

+ Details

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X

- Definition

The amount of revenue arising from the sale of goods in related party transactions. [Refer: Revenue; Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2023-01-01
-Paragraph 21
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2023-en-r&anchor=para_21_a&doctype=Standard
-URIDate 2023-03-23

+ Details

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- Details

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- Details

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- Details

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- Details

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