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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		12 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Earnings per share [abstract]
Earnings	[1]	£ 312.4	£ 672.4	£ 1,062.9
Weighted average shares used in basic EPS calculation		1,249.1	1,250.5	1,247.8
EPS		£ 0.250	£ 0.538	£ 0.852
Diluted earnings		£ 312.4	£ 672.4	£ 1,062.9
Weighted average shares used in diluted EPS calculation		1,257.3	1,259.4	1,261.2
Diluted EPS		£ 0.248	£ 0.534	£ 0.843
[1] Earnings is equivalent to profit for the period attributable to equity holders of the parent.

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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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 profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)]

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