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Trade and other receivables - Additional Information (Detail) - GBP (£) £ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Allowance for bad and doubtful debts as a percentage of gross trade accounts receivables	2.50%	1.60%	1.60%
Trade receivables [member]
Disclosure of detailed information about financial instruments [line items]
Bad debt expenses	£ 29.2	£ 12.3	£ 25.8
Overdue for more than 1 year [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of the asset aged or overdue for creating additional provison for losses	100.00%
Overdue for 6 months or more and for less than 1 year [member]
Disclosure of detailed information about financial instruments [line items]
Percentage of the asset aged or overdue for creating additional provison for losses	50.00%

X

- Definition

The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2019-03-27

+ Details

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X

- 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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X

- Definition

Allowance for bad and doubtful debts percentage.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Percentage of the asset overdue or aged for creating additional provisions.

+ References

No definition available.

+ Details

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Namespace Prefix:	wpp_
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X

- Details

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X

- Details

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- Details

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