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Intangible assets - Movement of Goodwill (Parenthetical) (Detail) £ in Millions | 12 Months Ended
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Dec. 31, 2019 GBP (£)
Disclosure of reconciliation of changes in goodwill [line items] |  |
Impairment on Classification As Held for Sale for Kantar Group | £ 94.5 | [1]
Accumulated impairment [member] |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |
Impairment on Classification As Held for Sale for Kantar Group | £ 70.9 | [2],[3]
[1] | Goodwill impairment of £94.5 million arose from the assessment of fair value less costs to sell under IFRS 5.
[2] | Figures have been restated, as described in the accounting policies.
[3] | Goodwill impairment of £70.9 million arose from the assessment of fair value less costs to sell of the Kantar group on classification as held for sale under IFRS 5.

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- Definition Goodwill impairment on classification as held for sale. + References No definition available. + Details
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