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Accounting policies - Additional Information (Detail) - GBP (£) £ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Transformation Plan [Member] |  |
Implementation of Configuration and Customisation Costs for Cloud Computing in a Saas Arrangement [Line Items] |  |
Capitalisation of costs associated with the implementation of software | £ 29.8 | £ 14.0

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- Definition Capitalisation of costs associate with implementation of software. + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Implementation of Configuration and Customisation Costs for Cloud Computing in a SaaS Arrangement. + References No definition available. + Details
Name: | wpp_ImplementationOfConfigurationAndCustomisationCostsForCloudComputingInASaasArrangementLineItems
Namespace Prefix: | wpp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | wpp_PlanNameAxis=wpp_TransformationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |