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Share of results of associates - Summary of Share of Results of Associates (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates [abstract]      
Share of profit before interest and taxation £ 123.8 £ 145.1 £ 97.1
Share of exceptional (losses)/gains (41.7) 0.8 (15.2)
Share of interest and non-controlling interests (9.7) (7.8) (4.7)
Share of taxation (28.9) (24.6) (27.4)
Share of profit loss of associates accounted for using equity method £ 43.5 £ 113.5 [1] £ 49.8 [1]
[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.