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Goodwill and acquisitions - Disclosure of Cash Generating Units with significant impairments of goodwill (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
 [2]
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Goodwill impairment £ 2,484.7 [1] £ 47.7
Wunderman Thompson [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount 1,932.2  
Goodwill impairment [1] 1,054.4  
VMLY&R [Member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount 918.3  
Goodwill impairment [1] 472.0  
Burson Cohn & Wolfe [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount 859.8  
Goodwill impairment [1] 127.0  
Geometry Global [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount 205.9  
Goodwill impairment [1] 232.5  
Landor And Fitch [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount 197.5  
Goodwill impairment [1] 158.1  
Other [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount 1,349.3  
Goodwill impairment [1] £ 440.7  
[1] Figures have been restated as described in the accounting policies.
[2] Figures for the period ended 30 June 2020 have been restated, as described in the accounting policies.