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Share of results of associates - Additional information (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of associates [line items]      
Restructuring and one off transaction costs £ 17.9 [1] £ 33.9 [2] £ 153.5
Continuing Operation [member]      
Disclosure of associates [line items]      
Share of exceptional losses and gains (51.4) (13.6) [2] (47.8)
Kantar [member]      
Disclosure of associates [line items]      
Amortisation and impairment of acquired intangible assets other than goodwill 27.3   5.3
Restructuring and one off transaction costs £ 23.1 £ 20.3
[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.