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Accounting policies - Additional Information (Detail) - GBP (£) £ in Millions	Jun. 30, 2021	Dec. 31, 2020
Transformation Plan [Member]
Implementation of Configuration and Customisation Costs for Cloud Computing in a Saas Arrangement [Line Items]
Capitalisation of costs associated with the implementation of software	£ 29.8	£ 14.0

X

- Definition

Capitalisation of costs associate with implementation of software.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Implementation of Configuration and Customisation Costs for Cloud Computing in a SaaS Arrangement.

+ References

No definition available.

+ Details

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

X

- Details

Name:	wpp_PlanNameAxis=wpp_TransformationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: