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Earnings per share - Calculation of basic and diluted EPS (Detail) £ / shares in Units, £ in Millions, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2023 GBP (£) £ / shares shares	Jun. 30, 2022 GBP (£) £ / shares shares	Jun. 30, 2022 USD ($) shares
Earnings per share [abstract]
Earnings	£ 112.0		$ 257.9
Weighted average shares used in basic EPS calculation | shares	1,071.2	1,115.2	1,115.2
EPS (pounds per share) | £ / shares	£ 0.105	£ 0.231
Diluted earnings | £	£ 112.0	£ 257.9
Weighted average shares used in diluted EPS calculation | shares	1,090.8	1,137.8	1,137.8
Diluted EPS (pounds per share) | £ / shares	£ 0.103	£ 0.227

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]]

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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).

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