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Goodwill and acquisitions - Disclosure of Cash Generating Units with significant impairments of goodwill (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Disclosure of Cash generating units with significant impairments of goodwill [Line Items] |  |
Goodwill impairment | £ 2,520.8 | £ 47.7
Wunderman Thompson [member] |  |
Disclosure of Cash generating units with significant impairments of goodwill [Line Items] |  |
Recoverable amount | 1,932.2 |
Goodwill impairment | 1,071.4 |
VMLY&R [Member] |  |
Disclosure of Cash generating units with significant impairments of goodwill [Line Items] |  |
Recoverable amount | 918.3 |
Goodwill impairment | 472.0 |
Burson Cohn & Wolfe [member] |  |
Disclosure of Cash generating units with significant impairments of goodwill [Line Items] |  |
Recoverable amount | 859.8 |
Goodwill impairment | 129.1 |
Geometry Global [member] |  |
Disclosure of Cash generating units with significant impairments of goodwill [Line Items] |  |
Recoverable amount | 205.9 |
Goodwill impairment | 232.9 |
Landor And Fitch [member] |  |
Disclosure of Cash generating units with significant impairments of goodwill [Line Items] |  |
Recoverable amount | 197.5 |
Goodwill impairment | 158.3 |
Other [member] |  |
Disclosure of Cash generating units with significant impairments of goodwill [Line Items] |  |
Recoverable amount | 1,349.3 |
Goodwill impairment | £ 457.1 |

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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The higher of an asset’s (or cash-generating unit’s) fair value less costs of disposal and its value in use. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 130 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_130_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure of Cash generating units with significant impairments of goodwill [line items] + References No definition available. + Details
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