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Intangible Assets - Movement of Goodwill (Detail) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of changes in goodwill [abstract]
Beginning balance	£ 8,453.4	£ 7,612.3
Goodwill impairment	63.6	37.9	£ 1.8
Ending balance	8,388.9	8,453.4	7,612.3
Cost
Reconciliation of changes in goodwill [abstract]
Beginning balance	12,144.6	10,991.0
Additions	319.1	262.6
Disposals	0.0	0.0
Exchange adjustments	(484.5)	891.0
Ending balance	11,979.2	12,144.6	10,991.0
Accumulated impairment losses and write-downs
Reconciliation of changes in goodwill [abstract]
Beginning balance	(3,691.2)	(3,378.7)
Goodwill impairment	63.6	37.9	1.8
Exchange adjustments	(164.5)	274.6
Ending balance	£ (3,590.3)	£ (3,691.2)	£ (3,378.7)

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

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- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

+ References

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- Definition

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

+ References

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- 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]

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Goodwill disposals .

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