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Share-based payments - Charges for Share-based Incentive Plans (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of share based payments [abstract] |  |  |  |  |
Share-based payments | £ 66.0 | £ 78.3 | [1] | £ 98.3 | [1]
[1] | Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.

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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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Period Type: | duration

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- Definition Disclosure of share based payments abstract. + References No definition available. + Details
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