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Share-based payments - Movements and Weighted-average Exercise Price for Options Granted (Details)
 12 Months Ended
Dec. 31, 2023
shares
£ / shares
Dec. 31, 2023
shares
$ / shares
£ / shares
Dec. 31, 2022
shares
£ / shares
Dec. 31, 2022
shares
$ / shares
£ / shares
Dec. 31, 2021
shares
£ / shares
Dec. 31, 2021
shares
$ / shares
Dec. 31, 2023
shares
$ / shares
Dec. 31, 2022
shares
$ / shares
Ordinary shares                
Disclosure of terms and conditions of share-based payment arrangement [Line items]                
Options granted, Beginning balance (in shares) 22,938,050 22,938,050 21,664,190 21,664,190        
Options granted, Granted (in shares) 5,586,650 5,586,650 5,224,050 5,224,050        
Exercise of share options (in shares) (85,900) (85,900) (125,700) (125,700) (534,800) (534,800)    
Options granted, Forfeited (in shares) (3,193,475) (3,193,475) (3,824,490) (3,824,490)        
Options granted, Ending balance (in shares) 25,245,325 25,245,325 22,938,050 22,938,050 21,664,190 21,664,190    
Options granted, Exercisable (in shares) 7,386,400 7,386,400 3,188,675 3,188,675     7,386,400 3,188,675
Ordinary shares | WPP                
Disclosure of terms and conditions of share-based payment arrangement [Line items]                
Options granted, Beginning balance (in shares) 0 0 6,741 6,741        
Options granted, Granted (in shares) 0 0 0 0        
Exercise of share options (in shares) 0 0 0 0        
Options granted, Forfeited (in shares) 0 0 (6,741) (6,741)        
Options granted, Ending balance (in shares) 0 0 0 0 6,741 6,741    
Options granted, Exercisable (in shares) 0 0 0 0     0 0
Weighted-average exercise price for options, 1 January (in pound per share) | £ / shares £ 0   £ 9.355          
Weighted-average exercise price for options, Granted (in pound per share) | £ / shares 0   0          
Weighted-average exercise price for options, Exercised (in pound per share) | £ / shares 0   0          
Weighted-average exercise price for options, Forfeited (in pound per share) | £ / shares 0   9.355          
Weighted-average exercise price for options, Outstanding 31 December (in pound per share) | £ / shares 0   0   £ 9.355      
Weighted-average exercise price for options, Exercisable (in pound per share) | £ / shares £ 0 £ 0 £ 0 £ 0        
Ordinary shares | WWOP                
Disclosure of terms and conditions of share-based payment arrangement [Line items]                
Options granted, Beginning balance (in shares) 1,639,025 1,639,025 2,049,299 2,049,299        
Options granted, Granted (in shares) 0 0 0 0        
Exercise of share options (in shares) 0 0 (2,575) (2,575)        
Options granted, Forfeited (in shares) (624,725) (624,725) (407,699) (407,699)        
Options granted, Ending balance (in shares) 1,014,300 1,014,300 1,639,025 1,639,025 2,049,299 2,049,299    
Options granted, Exercisable (in shares) 0 0 0 0     0 0
Weighted-average exercise price for options, 1 January (in pound per share) | £ / shares £ 13.224   £ 12.923          
Weighted-average exercise price for options, Granted (in pound per share) | £ / shares 0   0          
Weighted-average exercise price for options, Exercised (in pound per share) | £ / shares 0   8.458          
Weighted-average exercise price for options, Forfeited (in pound per share) | £ / shares 13.432   11.565          
Weighted-average exercise price for options, Outstanding 31 December (in pound per share) | £ / shares 13.145   13.224   £ 12.923      
Weighted-average exercise price for options, Exercisable (in pound per share) | £ / shares £ 0 £ 0 £ 0 £ 0        
Ordinary shares | WSOP                
Disclosure of terms and conditions of share-based payment arrangement [Line items]                
Options granted, Beginning balance (in shares) 21,299,025 21,299,025 19,608,150 19,608,150        
Options granted, Granted (in shares) 5,586,650 5,586,650 5,224,050 5,224,050        
Exercise of share options (in shares) (85,900) (85,900) (123,125) (123,125)        
Options granted, Forfeited (in shares) (2,568,750) (2,568,750) (3,410,050) (3,410,050)        
Options granted, Ending balance (in shares) 24,231,025 24,231,025 21,299,025 21,299,025 19,608,150 19,608,150    
Options granted, Exercisable (in shares) 7,386,400 7,386,400 3,188,675 3,188,675     7,386,400 3,188,675
Weighted-average exercise price for options, 1 January (in pound per share) | £ / shares £ 10.356   £ 10.854          
Weighted-average exercise price for options, Granted (in pound per share) | £ / shares 0   8.684          
Weighted-average exercise price for options, Exercised (in pound per share) | £ / shares 8.350   8.357          
Weighted-average exercise price for options, Forfeited (in pound per share) | £ / shares 9.959   10.530          
Weighted-average exercise price for options, Outstanding 31 December (in pound per share) | £ / shares 9.652   10.356   £ 10.854      
Weighted-average exercise price for options, Exercisable (in pound per share) | £ / shares £ 0 £ 0 £ 7.344 £ 7.344        
American depository receipts | WWOP                
Disclosure of terms and conditions of share-based payment arrangement [Line items]                
Weighted-average exercise price for options, 1 January (in dollars per share) | $ / shares   £ 106.379   £ 101.693        
Weighted-average exercise price for options, Granted (in dollars per share) | $ / shares   0   0        
Weighted-average exercise price for options, Granted (in dollars per share) | $ / shares   0   0        
Weighted-average exercise price for options, Forfeited (in dollars per share) | $ / shares   109.949   85.706        
Weighted-average exercise price for options, Outstanding 31 December (in dollars per share) | $ / shares   102.670   106.379   $ 101.693    
Weighted-average exercise price for options, Exercisable (in dollars per share) | $ / shares             $ 0 $ 0
American depository receipts | WSOP                
Disclosure of terms and conditions of share-based payment arrangement [Line items]                
Weighted-average exercise price for options, 1 January (in dollars per share) | $ / shares   67.910   72.228        
Weighted-average exercise price for options, Granted (in dollars per share) | $ / shares   0   52.600        
Weighted-average exercise price for options, Granted (in dollars per share) | $ / shares   48.950   53.270        
Weighted-average exercise price for options, Forfeited (in dollars per share) | $ / shares   66.181   71.674        
Weighted-average exercise price for options, Outstanding 31 December (in dollars per share) | $ / shares   £ 62.587   £ 67.910   $ 72.228    
Weighted-average exercise price for options, Exercisable (in dollars per share) | $ / shares             $ 44.120 $ 48.950