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Ordinary dividends - Additional Information (Detail) - £ / shares | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Interim period amount [member] |  |
Disclosure of Dividends [line items] |  |
Amounts recognised as distributions to equity holders, per share | £ 10.0 | £ 22.7
Dividend payable date | Nov. 06, 2020 |
Previous period final amount [member] |  |
Disclosure of Dividends [line items] |  |
Proposed final dividend, per share | £ 37.3 |

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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2019-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2019-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of Dividends [line items] + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Dividend payable date. + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Suspended dividends that were due to be proposed or declared. + References No definition available. + Details
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Namespace Prefix: | wpp_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |