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Share-based payments - Options Granted, WPP Worldwide Share Ownership Program (Details)
 12 Months Ended
Dec. 31, 2023
shares
ADRs
£ / shares
Dec. 31, 2023
shares
ADRs
$ / shares
Dec. 31, 2022
shares
Dec. 31, 2021
shares
Ordinary shares        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of ordinary shares under option (in shares) 25,245,325 25,245,325 22,938,050 21,664,190
WWOP | Ordinary shares        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of ordinary shares under option (in shares) 1,014,300 1,014,300 1,639,025 2,049,299
WWOP | Exercise price group 1 | Ordinary shares        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of ordinary shares under option (in shares) 647,575 647,575    
Exercise price per share (in pound per share) | £ / shares £ 13.145      
Exercise dates 2017-2024      
WWOP | Exercise price group 1 | American depository receipts        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of ADRs under option (in shares) | ADRs 72,695 72,695    
Exercise price per (in ADR per share) | $ / shares   $ 102.670    
Exercise dates 2017-2024      
WWOP | Exercise price group 2 | Ordinary shares        
Disclosure of range of exercise prices of outstanding share options [line items]        
Number of ordinary shares under option (in shares) 3,250 3,250    
Exercise price per share (in pound per share) | £ / shares £ 13.145      
Exercise dates 2018-2024