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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, 2019
Dec. 31, 2018
 [1]
Dec. 31, 2017
 [1]
Disclosure of associates [line items]      
Share of profit loss of associates accounted for using equity method £ 14.7 £ 30.5 £ 98.0
Continuing Operation one [Member]      
Disclosure of associates [line items]      
Share of profit before interest and taxation 99.2 [2] 110.8 129.7
Share of exceptional (losses)/gains (47.8) [2] (41.5) 0.6
Share of interest and non-controlling interests (19.4) [2] (15.1) (12.6)
Share of taxation (17.3) [2] (23.7) (19.7)
Share of profit loss of associates accounted for using equity method £ 14.7 [2] £ 30.5 £ 98.0
[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.
[2] From 5 December 2019 approximately 90% of the Kantar business is treated as a 40% associate following the completion of the transaction outlined in note 12.