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Intangible Assets - Cash-generating Units with Significant Goodwill (Detail) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of information for cash-generating units [line items]      
Goodwill £ 8,388.9 £ 8,453.4 £ 7,612.3
Brands with an indefinite useful life 412.4 1,103.4  
GroupM      
Disclosure of information for cash-generating units [line items]      
Goodwill 3,254.9 3,178.3  
Brands with an indefinite useful life 0.0 0.0  
Wunderman Thompson      
Disclosure of information for cash-generating units [line items]      
Goodwill 1,165.0 1,210.8  
Brands with an indefinite useful life 0.0 442.0  
VMLY&R      
Disclosure of information for cash-generating units [line items]      
Goodwill 814.6 776.0  
Brands with an indefinite useful life 0.0 207.6  
Ogilvy      
Disclosure of information for cash-generating units [line items]      
Goodwill 809.3 849.8  
Brands with an indefinite useful life 213.2 222.8  
BCW      
Disclosure of information for cash-generating units [line items]      
Goodwill 618.8 646.0  
Brands with an indefinite useful life 112.7 140.5  
AKQA Group      
Disclosure of information for cash-generating units [line items]      
Goodwill 600.1 628.7  
Brands with an indefinite useful life 0.0 0.0  
FGS Global      
Disclosure of information for cash-generating units [line items]      
Goodwill 452.1 451.8  
Brands with an indefinite useful life 0.0 0.0  
Hill & Knowlton      
Disclosure of information for cash-generating units [line items]      
Goodwill 141.7 145.7  
Brands with an indefinite useful life 33.2 34.8  
Landor Group      
Disclosure of information for cash-generating units [line items]      
Goodwill 115.0 106.5  
Brands with an indefinite useful life 53.3 55.7  
Other      
Disclosure of information for cash-generating units [line items]      
Goodwill 417.4 459.8  
Brands with an indefinite useful life £ 0.0 £ 0.0