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Earnings per share - Calculation of Basic and Diluted EPS (Detail) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Earnings per share [abstract] |  |  |  |
Weighted average shares used in basic EPS calculation |  | 1,211.9 | 1,224.7 |
EPS |  | £ 0.209 | £ (2.625) | [1]
Weighted average shares used in diluted EPS calculation |  | 1,229.0 | 1,237.0 |
Diluted EPS |  | £ 0.206 | £ (2.625) | [1]
Continuing Operation [member] |  |  |  |
Earnings per share [abstract] |  |  |  |
Earnings | [2] | £ 252.7 | £ (3,209.2) | [1]
Weighted average shares used in basic EPS calculation |  | 1,211.9 | 1,224.7 | [1]
EPS |  | £ 0.209 | £ (2.620) | [1]
Diluted earnings |  | £ 252.7 | £ (3,209.2) | [1]
Weighted average shares used in diluted EPS calculation | [3] | 1,229.0 | 1,224.7 | [1]
Diluted EPS |  | £ 0.206 | £ (2.620) | [1]
Discontinued operations [member] |  |  |  |
Earnings per share [abstract] |  |  |  |
Earnings | [2] |  | £ (6.8) |
Weighted average shares used in basic EPS calculation |  |  | 1,224.7 |
EPS |  |  | £ (0.005) |
Diluted earnings |  |  | £ (6.8) |
Weighted average shares used in diluted EPS calculation | [3] |  | 1,224.7 |
Diluted EPS |  |  | £ (0.005) |
Continuing and discontinued operations [member] |  |  |  |
Earnings per share [abstract] |  |  |  |
Earnings | [2] | £ 252.7 | £ (3,216.0) | [1]
Weighted average shares used in basic EPS calculation |  | 1,211.9 | 1,224.7 | [1]
EPS |  | £ 0.209 | £ (2.625) | [1]
Diluted earnings |  | £ 252.7 | £ (3,216.0) | [1]
Weighted average shares used in diluted EPS calculation | [3] | 1,229.0 | 1,224.7 | [1]
Diluted EPS |  | £ 0.206 | £ (2.625) | [1]
[1] | Figures have been restated as described in the accounting policies.
[2] | Earnings is equivalent to profit/(loss) for the period attributable to equity holders of the parent.
[3] | In 2020, the weighted average shares used in the basic EPS calculation has also been used for diluted EPS due to the anti- dilutive effect of the weighted average shares calculated for the diluted EPS calculation.

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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent entity, adjusted for the effects of all dilutive potential ordinary shares. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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