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Intangible assets - Movement of Goodwill (Detail) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [line items]
Beginning balance	£ 12,952.9	[1]	£ 13,214.3
Impairment losses for the year	183.9		27.1		£ 27.0
Ending balance	13,202.8		12,952.9	[1]	13,214.3
Cost [member]
Disclosure of reconciliation of changes in goodwill [line items]
Beginning balance	13,675.3		13,939.4
Additions	154.4		301.0
Revision of earnout estimates	(68.3)		(60.7)
Exchange adjustments	368.1		(504.4)
Ending balance	14,129.5		13,675.3		13,939.4
Accumulated impairment losses and write-downs [member]
Disclosure of reconciliation of changes in goodwill [line items]
Beginning balance	722.4		725.1
Impairment losses for the year	183.9		27.1
Exchange adjustments	20.4		(29.8)
Ending balance	£ 926.7		£ 722.4		£ 725.1
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.

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]]

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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]]

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

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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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Revision of earn-out estimates goodwill.

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