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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure [Abstract]  
Summary of Property, Plant and Equipment
        
  Land and
buildings
$m
    
Fixtures,
  fittings and
equipment
$m
    
    Total
$m
  
Cost
                          
At 1 January 2023       112       292       404  
Additions       1       20       21  
Fully depreciated assets written off       –       (15 )      (15 ) 
Disposals       (2 )      (3 )      (5 ) 
Exchange and other adjustments       –       6       6  
At 31 December 2023       111       300       411  
Additions    
–
 
27
 
27
Fully depreciated assets written off    
(3
) 
  
(27
) 
  
(30
) 
Disposals    
(8
) 
  
(8
) 
  
(16
) 
Exchange and other adjustments    
(1
) 
  
(4
) 
  
(5
) 
At 31 December 2024
    
99
 
288
 
387
Depreciation and impairment
                          
At 1 January 2023       (51 )      (196 )      (247 ) 
Provided       (6 )      (18 )      (24 ) 
System Fund expense       –       (4 )      (4 ) 
Fully depreciated assets written off       –       15       15  
Disposals       2       3       5  
Exchange and other adjustments       1       (4 )      (3 ) 
At 31 December 2023       (54 )      (204 )      (258 ) 
Provided    
(3
) 
  
(21
) 
  
(24
) 
System Fund expense    
–
 
(4
) 
  
(4
) 
Impairment reversal    
–
 
3
 
3
Fully depreciated assets written off    
3
 
27
 
30
Disposals    
–
 
8
 
8
Exchange and other adjustments    
1
 
3
 
4
At 31 December 2024
    
(53
) 
  
(188
) 
  
(241
) 
                           
Net book value
                          
At 31 December 2024
    
46
 
100
 
146
At 31 December 2023       57       96       153  
At 1 January 2023       61       96       157