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Taxation - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disclosure Of Income Taxes [line items] |  |  |
Effective tax rate on reported (loss)/profit before taxation | (0.90%) | 26.70% | 28.00%

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- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2019-03-27 + Details
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Period Type: | duration

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- Definition Line items represent concepts included in income taxes. + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration