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Share of results of associates - Summary of Share of Results of Associates (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Disclosure of associates [abstract] |  |  |  |  |
Share of profit before interest and taxation | £ 52.8 | £ 59.2 |  | £ 145.1 |
Share of exceptional (losses)/gains | (28.4) | 13.2 |  | 0.8 |
Share of interest and non-controlling interests | (3.2) | (3.2) |  | (7.8) |
Share of taxation | (11.8) | (9.7) |  | (24.6) |
Share of profit loss of associates accounted for using equity method | £ 9.4 | £ 59.5 | [1] | £ 113.5 | [1]
[1] | Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.

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- Definition 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)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Share of exceptional gains (losses) of associates. + References No definition available. + Details
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- Definition Share of interest and non-controlling interests of associates. + References No definition available. + Details
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- Definition Share of profit before interest and taxation of associates. + References No definition available. + Details
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- Definition Share of taxation of associates. + References No definition available. + Details
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