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Acquisitions - Additional Information (Detail) - GBP (£) £ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about business combination [abstract]
Goodwill that is expected to be deductible for tax purposes	£ 65.3	£ 63.9	£ 54.8

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- References

No definition available.

+ Details

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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 2018-01-01
-Paragraph B64
-Subparagraph k
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_k&doctype=Appendix&seq=2
-URIDate 2018-03-16

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