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Ordinary dividends - Summary of Ordinary Dividends (Detail) - GBP (£) £ / shares in Units, £ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Dividends [line items]
Amounts recognised as distributions to equity holders, per share	£ 0.6000	£ 0.5975	£ 0.4833
Amounts recognised as distributions to equity holders	£ 747.4	£ 751.5	£ 616.5
Proposed final dividend, per share	£ 0.3730	£ 0.3730	£ 0.3705
Previous period final amount [member]
Disclosure of Dividends [line items]
Amounts recognised as distributions to equity holders, per share	£ 0.3730	£ 0.3705	£ 0.2878
Amounts recognised as distributions to equity holders	£ 464.6	£ 467.2	£ 368.5
Interim period amount [member]
Disclosure of Dividends [line items]
Amounts recognised as distributions to equity holders, per share	£ 0.2270	£ 0.2270	£ 0.1955
Amounts recognised as distributions to equity holders	£ 282.8	£ 284.3	£ 248.0

X

- Definition

The amount of dividends paid per ordinary share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
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X

- 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
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-IssueDate 2018-01-01
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X

- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
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- Definition

Disclosure of Dividends [line items]

+ References

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