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Interests in associates, joint ventures and other investments - Summary of Aggregate Financial Performance of Associates and Joint Ventures (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of principal associates and joint ventures [line items]
Share of other comprehensive (loss)/ earnings of associate undertakings	£ (0.9)	£ 51.2	£ 13.5
Associates and Joint Ventures
Disclosure of principal associates and joint ventures [line items]
Share of results of associate undertakings	70.2	(60.4)	23.8
Share of other comprehensive (loss)/ earnings of associate undertakings	(0.9)	51.2	13.5
Share of total comprehensive earnings/(loss) of associate undertakings	£ 69.3	£ (9.2)	£ 37.3

X

- Definition

The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph B16
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B16_c&doctype=Appendix&subtype=B
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 91
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_a&doctype=Standard
-URIDate 2023-03-23

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- Definition

The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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- Definition

Disclosure Of Aggregate Investments In Associates Joint Ventures.

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- Definition

Share of comprehensive income of associates and joint ventures accounted for using equity method.

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