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Goodwill and Acquisitions - Additional Information (Detail) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disclosure Of Goodwill [Abstract]
Increase (decrease) of goodwill in relation to subsidiary undertakings	£ (2.4)	£ 132.2

X

- Definition

The increase (decrease) in goodwill. [Refer: Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2017-01-01
-Paragraph B67
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d&doctype=Appendix&seq=2
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ChangesInGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosure Of Goodwill [Abstract]

+ References

No definition available.

+ Details

Name:	wpp_DisclosureOfGoodwillAbstract
Namespace Prefix:	wpp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration