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Goodwill and acquisitions - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Goodwill impairment |  | £ 2,812.9 | [1]
Assumed annual long-term growth rate |  | 2.00% |
Pre tax Discount Rate For Global Network CGUs [Member] |  |  |
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Pre-tax discount rate |  | 12.50% |
First Step [Member] |  |  |
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Assumed annual long-term growth rate |  | 0.00% |
Bottom of range [member] | Range Of Pre tax Discount Rates For Regional Specific Cash Generating Units [Member] |  |  |
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Pre-tax discount rate |  | 10.80% |
Top of range [member] | Range Of Pre tax Discount Rates For Regional Specific Cash Generating Units [Member] |  |  |
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Pre-tax discount rate |  | 19.30% |
Global Networks [Member] | First Step [Member] |  |  |
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Pre-tax discount rate |  | 13.50% |
Global Integrated Agencies Segment [Member] |  |  |
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Goodwill impairment |  | £ 1,820.1 |
Public Relation Agencies Segment [Member] |  |  |
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Goodwill impairment |  | 157.1 |
Specialist Agencies Segment [Member] |  |  |
Disclosure Of Goodwill Acquisitions And Disposals [Line Items] |  |  |
Goodwill impairment |  | £ 835.7 |
[1] | Figures have been restated as described in the accounting policies.

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