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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
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.