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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
	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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Goodwill impairment on classification as held for sale.

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Schedule Of Detailed Information About Amounts Of Discontinued Operations Included In Profit

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