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Goodwill and acquisitions - Disclosure of Cash Generating Units with significant impairments of goodwill (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount   £ 5,100.0
Goodwill impairment 2,812.9 [1]
Previously stated [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount [2]   5,463.0
Goodwill impairment [2]   2,484.7
Wunderman Thompson [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount   1,759.5
Goodwill impairment   1,207.5
Wunderman Thompson [member] | Previously stated [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount [2]   1,932.2
Goodwill impairment [2]   1,054.4
VMLY&R [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount   871.0
Goodwill impairment   516.9
VMLY&R [member] | Previously stated [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount [2]   918.3
Goodwill impairment [2]   472.0
Burson Cohn & Wolfe [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount   845.9
Goodwill impairment   140.3
Burson Cohn & Wolfe [member] | Previously stated [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount [2]   859.8
Goodwill impairment [2]   127.0
Geometry Global [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount   128.4
Goodwill impairment   305.8
Geometry Global [member] | Previously stated [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount [2]   205.9
Goodwill impairment [2]   232.5
Landor & Fitch [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount   169.5
Goodwill impairment   185.4
Landor & Fitch [member] | Previously stated [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount [2]   197.5
Goodwill impairment [2]   158.1
Other [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount   1,325.7
Goodwill impairment   457.0
Other [member] | Previously stated [member]    
Disclosure of Cash generating units with significant impairments of goodwill [Line Items]    
Recoverable amount [2]   1,349.3
Goodwill impairment [2]   £ 440.7
[1] Figures have been restated as described in the accounting policies.
[2] As previously reported in the Company’s Form 6-K/A filed on 12 February 2021.