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Costs of services and general and administrative costs - Additional Information (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure Of Information About Operating Cost [line items]      
Goodwill impairment £ 2,520.8   £ 47.7
Gains on disposal of investments and subsidiaries 16.0 £ 40.6 [1] 40.4
Litigation settlement   16.8 [1] £ 16.8
Lease Term     15 years
Gain on sale of freehold property in New York   7.9 [1] £ 7.9
Proceeds from sale of freehold property     159.0
Impairment charge on intangible assets 17.1 4.7 26.5
Investment write-downs 220.6   7.5
Restructuring costs due to pandemic 39.3    
Covid-19 pandemic [member]      
Disclosure Of Information About Operating Cost [line items]      
Proceeds from government grants 28.6    
Imagina [member]      
Disclosure Of Information About Operating Cost [line items]      
Investment write-downs 209.8    
Investor day in december two thousand and eighteen restructuring and transformation plan [member]      
Disclosure Of Information About Operating Cost [line items]      
Restructuring and transformation costs in relation to the continuing restructuring plan 17.9 23.6 121.1
Transformation costs   £ 10.3 32.4
Comscore Inc. [member]      
Disclosure Of Information About Operating Cost [line items]      
Litigation settlement     16.8
Two Circles [member]      
Disclosure Of Information About Operating Cost [line items]      
Gains on disposal of investments and subsidiaries £ 14.7    
Chime [Member]      
Disclosure Of Information About Operating Cost [line items]      
Gains on disposal of investments and subsidiaries     28.6
Other business [member]      
Disclosure Of Information About Operating Cost [line items]      
Goodwill impairment     £ 47.7
[1] 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.