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Assets held for sale and discontinued operations - Detailed Information About Amounts Of Discontinued Operations Included In Profit (Parenthetical) (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Statement [LineItems]      
Impairment on Classification As Held for Sale for Kantar Group     £ (94.5)
Gain (loss) on disposal of business [1] £ 31.0 £ 37.0 [2] 93.8
Discontinued operations [member]      
Statement [LineItems]      
Impairment on Classification As Held for Sale for Kantar Group [3]     (94.5)
Gain (loss) on disposal of business [4] 9.9 £ 6.5 £ 14.6
Discontinued operations [member] | Kantar [member] | WPP Scan Group [member]      
Statement [LineItems]      
Gain (loss) on disposal of business £ 9.3    
Percentage of ownership interest in subsidiaries 56.25%    
[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.
[3] Goodwill impairment of £94.5 million arose from the assessment of fair value less costs to sell under IFRS 5 in the year ended 31 December 2019.
[4] In 2020, non-controlling interests includes £9.3 million recognised on the disposal of Kantar within WPP Scangroup, a 56.25% owned subsidiary of the Group.