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Share-based payments (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure [Abstract]  
Summary of Cost Related to Share-Based Payment Transactions
        
2024
$m
        
2023
$m
          
2022
$m
  
Equity-settled
                              
Operating profit before System Fund, reimbursables and exceptional items      
37
         31         28  
System Fund      
23
         20         16  
       
60
         51         44  
Cash-settled
                              
Operating profit before System Fund, reimbursables and exceptional items      
7
         5         2  
       
   67
            56            46  
Summary of Information about Awards Granted
 
a.
The expected volatility was determined by calculating the historical volatility of the Company’s share price corresponding to the expected life of the share award.
Summary of Movements in Awards Outstanding Under the Schemes
       
APP/DAP
        
LTIP/DAP
  
Number of share awards (thousands)
      
   Deferred shares/
one-off
awards
        
   Performance-related

awards/LTI
          
   Restricted stock
units
  
Outstanding at 1 January 2022
      
348
        
872
        
1,350
  
Granted
      
236
        
323
        
706
  
Vested
      
(254
) 
      
(23
) 
      
(391
) 
Lapsed or cancelled
      
(9
) 
      
(239
) 
      
(90
) 
Outstanding at 31 December 2022
      
321
        
933
        
1,575
  
Granted
      
214
        
329
        
683
  
Vested
      
(186
) 
      
(180
) 
      
(533
) 
Lapsed or cancelled
      
(17
) 
      
(246
) 
      
(63
) 
Outstanding at 31 December 2023
      
332
        
836
        
1,662
  
Granted
      
104
        
279
        
495
  
Vested
      
(44
) 
      
(136
) 
      
(402
) 
Lapsed or cancelled
      
(6
) 
      
(148
) 
      
(106
) 
Outstanding at 31 December 2024
      
386
        
831
        
1,649
  
Fair value of awards granted during the year (cents)
                              
2024
      
10,837.6
        
5,812.6
        
10,302.3
  
2023
      
6,926.4
        
3,169.7
        
6,351.0
  
2022
      
6,180.2
        
3,770.0
        
5,656.4
  
Weighted average remaining contract life (years)
                              
At 31 December 2024
      
0.9
        
1.1
        
1.1
  
At 31 December 2023
      
1.5
        
1.3
        
1.3
  
At 31 December 2022
      
1.0
        
1.1
        
1.2