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Financial instruments - Summary of Other Investments (Detail) - GBP (£) £ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | [1] | Jun. 30, 2017 | [1]
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Disclosure of fair value of other investments in equity investments designated at fair value through profit or loss and other comprehensive income [abstract] |  |  |
Fair value through profit or loss | £ 295.9 |  |
Fair value through other comprehensive income | 653.4 |  |
Other investments | £ 949.3 | £ 1,153.5 | £ 1,171.5
[1] | Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.

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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 11A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_11A_c&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_h&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Disclosure of fair value of other investments in equity investments designated at fair value through profit or loss and other comprehensive income [abstract] + References No definition available. + Details
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