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Goodwill and acquisitions - Cash-generating Units (CGUs) with Significant Goodwill (Detail) - GBP (£)
£ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
 [2],[3]
Disclosure of information for cash-generating units [line items]      
Goodwill £ 8,096.3 [1] £ 10,110.6 [1] £ 13,181.7
Brands with an indefinite useful life 1,129.8 1,078.2  
GroupM [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 3,057.9 2,921.7  
Wunderman Thompson [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 1,167.2 2,121.9  
Brands with an indefinite useful life 433.3 409.7  
VMLY&R [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 460.6 901.0  
Brands with an indefinite useful life 203.6 199.1  
Ogilvy [Member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 823.8 758.6  
Brands with an indefinite useful life 218.5 211.1  
Burson Cohn Wolfe [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 651.3 739.3  
Brands with an indefinite useful life 138.0 130.2  
Other [member]      
Disclosure of information for cash-generating units [line items]      
Goodwill [1] 1,935.5 2,668.1  
Brands with an indefinite useful life £ 136.4 £ 128.1  
[1] Figures have been restated as described in the accounting policies.
[2] Figures have been restated to be in accordance with IAS 32 Financial Instruments: Presentation, as described in the accounting policies.
[3] Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.