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Earnings per share - Reconciliation Between Shares Used in Calculating Basic and Diluted EPS (Details) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings per share [abstract]
Diluted earnings	£ 110.4	£ 682.7	£ 637.7
Weighted average shares used in diluted EPS calculation	1,094.0	1,116.4	1,215.3
Diluted earnings per ordinary share (sterling per share)	£ 0.101	£ 0.612	£ 0.525
Weighted average shares used in basic EPS calculation	1,072.1	1,097.9	1,194.1
Dilutive share options outstanding	0.6	0.7	1.3
Other potentially issuable shares	21.3	17.8	19.9

X

- 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

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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]]

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The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options.

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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)]

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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.

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