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Trade and Other Payables Amounts Falling Due After More than One Year - Summary of Contingent Consideration (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Disclosure Of Fair Value Of Contingent Consideration [Abstract] |  |  |
At the beginning of the period | £ 630.7 | £ 976.5 | £ 976.5
Earnouts paid | (38.0) | (61.7) | (199.1)
New acquisitions | 11.9 | 71.4 | 163.7
Revision of estimates taken to goodwill | (26.3) | (23.2) | (60.7)
Revaluation of payments due to vendors (note 7) | (29.7) | (69.4) | (208.6)
Exchange adjustments | (5.7) | (22.9) | (41.1)
At the end of the period | £ 542.9 | £ 870.7 | £ 630.7

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- Definition Disclosure Of Fair Value Of Contingent Consideration [Abstract]. + References No definition available. + Details
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- Definition Earnouts paid. + References No definition available. + Details
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- Definition Increase (decrease) through business combinations, contingent consideration. + References No definition available. + Details
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- Definition Revaluation of payments due to vendors, Increase decrease in payables + References No definition available. + Details
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- Definition Revision of estimates taken to goodwill. + References No definition available. + Details
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Namespace Prefix: | wpp_
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Balance Type: | debit
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