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Share of results of associates - Summary of Share of Results of Associates (Detail) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of associates [line items]
Share of profit loss of associates accounted for using equity method	£ 40.0	£ (51.9)	[1]
Continuing Operation one [Member]
Disclosure of associates [line items]
Share of profit before interest and taxation	85.9	46.2
Share of exceptional gains/(losses)	11.7	(51.4)
Share of interest and non-controlling interests	(39.1)	(40.4)
Share of taxation	(18.5)	(6.3)
Share of profit loss of associates accounted for using equity method	£ 40.0	£ (51.9)
[1] Figures have been restated as described in the accounting policies.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The entity's share of the profit (loss) of associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Profit (loss)]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URIDate 2020-01-01

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Share of exceptional gains (losses) of associates.

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Share of interest and non-controlling interests of associates.

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Share of profit before interest and taxation of associates.

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Share of taxation of associates.

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