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Taxation - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Income Taxes [line items] |  |  |  |  |  |
Effective tax rate on profit before taxation | [1] | 22.60% | 25.10% | [2] | 4.40% | [2]
[1] | Profit before taxation has been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.
[2] | Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies. As a result Data Investment Management is now excluded from the segment analysis.

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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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Balance Type: | na
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_
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Balance Type: | na
Period Type: | duration