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Goodwill and Acquisitions - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Disclosure Of Goodwill [Abstract] |  |
Increase (decrease) of goodwill in relation to subsidiary undertakings | £ (2.4) | £ 132.2

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- Definition The increase (decrease) in goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Disclosure Of Goodwill [Abstract] + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration