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Leases - Additional Information (Detail) £ in Millions | Dec. 31, 2019 GBP (£)
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Text block [abstract] |
Future cash flows for leases not yet commenced to which lessee is committed | £ 558.0

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- Definition Future cash flows for leases not yet commenced to which lessee is committed. + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Text block [abstract] + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration