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Acquisitions - Additional Information (Detail) - GBP (£) £ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about business combination [abstract] |  |
Goodwill that is expected to be deductible for tax purposes | £ 65.3 | £ 63.9

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- Definition The amount of goodwill in a business combination that is expected to be deductible for tax purposes. [Refer: Goodwill; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph k -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_k&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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