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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, 2020
Jun. 30, 2019
 [2]
Dec. 31, 2019
Disclosure of associates [line items]      
Share of profit loss of associates accounted for using equity method [1] £ (51.9) £ 1.5 £ 14.7
Continuing Operation one [Member]      
Disclosure of associates [line items]      
Share of profit before interest and taxation 46.2 26.2 99.2
Share of exceptional losses (51.4) (13.6) (47.8)
Share of interest and non-controlling interests (40.4) (8.0) (19.4)
Share of taxation (6.3) (3.1) (17.3)
Share of profit loss of associates accounted for using equity method £ (51.9) £ 1.5 £ 14.7
[1] Figures have been restated as described in the accounting policies.
[2] Figures for the period ended 30 June 2019 have been re-presented in accordance with IFRS 5: Non-current Assets Held for Sale and Discontinued Operations, as described in note 13.