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Share of results of associates - Additional Information (Detail) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Kantar [member]
Disclosure of associates [line items]
Share of exceptional losses of associates	£ 11.7	£ (51.4)

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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

No definition available.

+ Details

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- Definition

Share of exceptional gains (losses) of associates.

+ References

No definition available.

+ Details

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Namespace Prefix:	wpp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	wpp_ContinuingAndDiscontinuedOperationAxis=wpp_KantarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: