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Interests in associates, joint ventures and other investments - Additional Information (Detail) - GBP (£) £ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | [1]
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Disclosure of principal associates and joint ventures [line items] |  |  |  |
Interests in associates and joint ventures | £ 813.0 | £ 796.8 | [1] | £ 1,065.2
GIIR Inc [member] |  |  |  |
Disclosure of principal associates and joint ventures [line items] |  |  |  |
Market value of equity interests | 21.2 | 26.3 |  |
Interests in associates and joint ventures | 37.7 | 46.8 |  |
High Co SA [member] |  |  |  |
Disclosure of principal associates and joint ventures [line items] |  |  |  |
Market value of equity interests | 39.4 | 30.3 |  |
Interests in associates and joint ventures | 35.4 | 37.1 |  |
Associates and Other Investments [member] |  |  |  |
Disclosure of principal associates and joint ventures [line items] |  |  |  |
Capital commitments contracted | £ 21.8 | £ 31.4 |  |
[1] | Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_24_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_e&doctype=Standard -URIDate 2019-03-27 + Details
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