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Assets held for sale and discontinued operations - Detailed Information About Amounts Of Discontinued Operations Included In Profit (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement [LineItems] |  |  |  |  |  |
Revenue | [1] | £ 13,234.1 | £ 13,046.7 | [2] | £ 13,146.4 | [2]
Costs of services |  | (10,825.1) | (10,559.1) |  | (10,481.6) |
Gross profit |  | 2,409.0 | 2,487.6 |  | 2,664.8 |
General and administrative costs |  | (1,113.1) | (1,249.7) |  | (1,086.9) |
Operating profit |  | 1,295.9 | 1,237.9 |  | 1,577.9 |
Share of results of associates |  | 14.7 | 30.5 | [2] | 98.0 | [2]
Profit before interest and taxation |  | 1,310.6 | 1,268.4 |  | 1,675.9 |
Finance income |  | 99.0 | 98.9 |  | 89.0 |
Finance costs |  | (359.1) | (279.1) |  | (261.9) |
Revaluation Of Financial Instruments |  | (68.4) | 169.4 |  | 243.9 |
Profit before taxation |  | 982.1 | 1,257.6 |  | 1,746.9 |
Attributable tax expense |  | (275.0) | (256.0) |  | (83.0) |
Profit after taxation |  | 717.9 | 1,139.4 |  | 1,912.3 |
Goodwill impairment on classification as held for sale | [3] | (94.5) |  |  |  |
Attributable to: |  |  |  |  |  |
Equity holders of the parent |  | 624.1 | 1,062.9 |  | 1,816.6 |
Non-controlling interests |  | 93.8 | 76.5 |  | 95.7 |
Profit for the year from discontinued operations |  | 10.8 | 137.8 |  | 248.4 |
Discontinued operations [member] |  |  |  |  |  |
Statement [LineItems] |  |  |  |  |  |
Revenue |  | 2,387.5 | 2,555.7 |  | 2,657.8 |
Costs of services |  | (1,951.5) | (2,104.4) |  | (2,147.4) |
Gross profit |  | 436.0 | 451.3 |  | 510.4 |
General and administrative costs |  | (151.7) | (257.8) |  | (180.1) |
Operating profit |  | 284.3 | 193.5 |  | 330.3 |
Share of results of associates |  | 6.5 | 13.0 |  | 15.5 |
Profit before interest and taxation |  | 290.8 | 206.5 |  | 345.8 |
Finance income |  | 3.6 | 5.4 |  | 6.2 |
Finance costs |  | (17.3) | (9.7) |  | (7.9) |
Revaluation Of Financial Instruments |  | (9.4) | 3.5 |  | 18.3 |
Profit before taxation |  | 267.7 | 205.7 |  | 362.4 |
Attributable tax expense |  | (78.8) | (67.9) |  | (114.0) |
Profit after taxation |  | 188.9 | 137.8 |  | 248.4 |
Gain on sale of discontinued operations |  | 73.8 |  |  |  |
Attributable tax expense on sale of discontinued operations |  | (157.4) |  |  |  |
Net gain attributable to discounted operations |  | 10.8 | 137.8 |  | 248.4 |
Attributable to: |  |  |  |  |  |
Equity holders of the parent |  | (3.8) | 126.4 |  | 237.1 |
Non-controlling interests |  | 14.6 | 11.4 |  | 11.3 |
Profit for the year from discontinued operations |  | £ 10.8 | £ 137.8 |  | £ 248.4 |
[1] | Intersegment sales have not been separately disclosed as they are not material.
[2] | Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[3] | Goodwill impairment of £94.5 million arose from the assessment of fair value less costs to sell under IFRS 5.

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_99&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_103&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Gain loss recognized on disposal of discontinued operations net of tax. + References No definition available. + Details
Name: | wpp_GainLossRecognizedOnDisposalOfDiscontinuedOperationsNetOfTax
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Goodwill impairment on classification as held for sale. + References No definition available. + Details
Name: | wpp_GoodwillImpairmentOnClassificationAsHeldForSale
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The profit (loss) before interest and taxation. + References No definition available. + Details
Name: | wpp_ProfitLossBeforeInterestAndTaxation
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Revaluation of financial instruments. + References No definition available. + Details
Name: | wpp_RevaluationOfFinancialInstruments
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Statement [line item] + References No definition available. + Details
Name: | wpp_StatementLineItems
Namespace Prefix: | wpp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The tax expense (income) relating to the gain (loss) on discontinued operations. + References No definition available. + Details
Name: | wpp_TaxExpenseRelatingToGainLossOnDiscontinuedOperations
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=ifrs-full_DiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |