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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]
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.

X

- 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
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-IssueDate 2017-01-01
-Paragraph 11A
-Subparagraph c
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
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-IssueDate 2017-01-01
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-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

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X

- 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
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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

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- Definition

Fair value of Investments in equity instruments designated as measured at fair value through profit or loss.

+ References

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