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Trade and other receivables - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Trade and other receivables [abstract] |  |  |
Bad debt expense recognised on trade accounts receivables | £ 21.8 | £ 8.3 | £ 19.0

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- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Provision for bad debt expense. + References No definition available. + Details
Name: | wpp_ProvisionForBadDebtExpense
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration