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Intangible assets - Cash-generating Units with Significant Goodwill (Detail) - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information for cash-generating units [line items]      
Goodwill [1] £ 10,110.6 £ 13,132.6 £ 12,874.6
Brands with an indefinite useful life 1,078.2 1,132.8  
GroupM [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 2,921.7 2,928.6  
Kantar [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1]   2,513.0  
Wunderman Thompson [Member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 2,121.9 2,101.8  
Brands with an indefinite useful life 409.7 424.8  
VMLYAndR [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 901.0 930.4  
Brands with an indefinite useful life 199.1 206.6  
Ogilvy [Member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 758.6 614.4  
Brands with an indefinite useful life 211.1 219.1  
Burson Cohn Wolfe [Member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 739.3 711.9  
Brands with an indefinite useful life 130.2 135.4  
Other [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 2,668.1 3,332.5  
Brands with an indefinite useful life £ 128.1 £ 146.9  
[1] Figures have been restated, as described in the accounting policies.