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Goodwill, acquisitions and disposals - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Disclosure Of Goodwill [abstract] |  |
Increase (decrease) of goodwill in relation to subsidiary undertakings | £ 49.3 | £ (2.4)

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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 2018-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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