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Intangible assets - Cash-generating Units with Significant Goodwill (Detail) - GBP (£) £ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | [1] | £ 10,110.6 | £ 13,132.6 | £ 12,874.6
Brands with an indefinite useful life |  | 1,078.2 | 1,132.8 |
GroupM [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | [1] | 2,921.7 | 2,928.6 |
Kantar [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | [1] |  | 2,513.0 |
Wunderman Thompson [Member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | [1] | 2,121.9 | 2,101.8 |
Brands with an indefinite useful life |  | 409.7 | 424.8 |
VMLYAndR [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | [1] | 901.0 | 930.4 |
Brands with an indefinite useful life |  | 199.1 | 206.6 |
Ogilvy [Member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | [1] | 758.6 | 614.4 |
Brands with an indefinite useful life |  | 211.1 | 219.1 |
Burson Cohn Wolfe [Member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | [1] | 739.3 | 711.9 |
Brands with an indefinite useful life |  | 130.2 | 135.4 |
Other [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | [1] | 2,668.1 | 3,332.5 |
Brands with an indefinite useful life |  | £ 128.1 | £ 146.9 |
[1] | Figures have been restated, as described in the accounting policies.

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