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Assets held for sale and discontinued operations - Detailed Information About Amounts Of Discontinued Operations Included In Profit (Parenthetical) (Detail) £ in Millions | 12 Months Ended
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Dec. 31, 2019 GBP (£)
Schedule Of Detailed Information About Amounts Of Discontinued Operations Included In Profit [Abstract] |  |
Impairment on Classification As Held for Sale for Kantar Group | £ (94.5) | [1]
[1] | 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 Schedule Of Detailed Information About Amounts Of Discontinued Operations Included In Profit + References No definition available. + Details
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