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Interests in associates, joint ventures and other investments - Additional Information (Detail) - GBP (£) £ in Millions	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Disclosure of principal associates and joint ventures [line items]
Carrying value (including goodwill and other intangibles) of equity interests	£ 796.8	£ 1,065.2	[1]	£ 1,069.4
GIIR Inc [member]
Disclosure of principal associates and joint ventures [line items]
Market value of equity interests	26.3	35.4
Carrying value (including goodwill and other intangibles) of equity interests	46.8	41.6
High Co SA [member]
Disclosure of principal associates and joint ventures [line items]
Market value of equity interests	30.3	33.3
Carrying value (including goodwill and other intangibles) of equity interests	37.1	34.5
Associates and Other Investments [member]
Disclosure of principal associates and joint ventures [line items]
Capital commitments contracted	£ 31.4	£ 54.2
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.

X

- Definition

The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
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- Definition

The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph 21
-Subparagraph b
-Clause iii
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- Definition

The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries]

+ 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 principal associates and joint ventures.

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