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Going concern and risk management policies - Additional Information (Detail) - GBP (£) £ in Millions	Jul. 09, 2019	Jun. 30, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]
Total committed facilities available		£ 7,838.2
Events After Reporting Period [member] | Kantar [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Proceeds from proposed sale	£ 3,100.0
Net proceeds to be retained from proposed sale	60.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

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- Definition

Approximate Consideration From Proposed Sale After Tax and Disposal Costs.

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- Definition

WPP intends to retain approximately 60% of net proceeds from proposed sale.

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