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Ordinary dividends - Summary of Ordinary Dividends (Detail) - GBP (£) £ / shares in Units, £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Dividends [line items] |  |  |
Amounts recognised as distributions to equity holders, per share | £ 0.6000 | £ 0.6000 | £ 0.5975
Amounts recognised as distributions to equity holders | £ 750.5 | £ 747.4 | £ 751.5
Proposed final dividend, per share | £ 0.3730 |  |
Previous period final amount [member] |  |  |
Disclosure of Dividends [line items] |  |  |
Amounts recognised as distributions to equity holders, per share | £ 0.3730 | £ 0.3730 | £ 0.3705
Amounts recognised as distributions to equity holders | £ 466.4 | £ 464.6 | £ 467.2
Interim period amount [member] |  |  |
Disclosure of Dividends [line items] |  |  |
Amounts recognised as distributions to equity holders, per share | £ 0.2270 | £ 0.2270 | £ 0.2270
Amounts recognised as distributions to equity holders | £ 284.1 | £ 282.8 | £ 284.3

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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2019-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2019-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash outflow for dividends paid to equity holders of the parent, classified as financing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure of Dividends [line items] + References No definition available. + Details
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- Definition Suspended dividends that were due to be proposed or declared. + References No definition available. + Details
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- Details
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- Details
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