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Equity (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure [Abstract]  
Summary of Equity Share Capital
Equity share capital
Allotted, called up and fully paid       Number
of shares
millions		         Nominal
value
$m		           Share
premium $m		           Equity
share
capital
$m		  
At 1 January 2022 (ordinary shares of 20
340
/
399
p each)		       187         53         101         154  
Repurchased and cancelled under share repurchase programme       (4 )        (1 )        –         (1 ) 
Exchange adjustments       –         (6 )        (10 )        (16 ) 
At 31 December 2022 (ordinary shares of 20
340
/
399
p each)		       183         46         91         137  
Repurchased and cancelled under share repurchase programme       (11 )        (3 )        –         (3 ) 
Exchange adjustments       –         3         4         7  
At 31 December 2023 (ordinary shares of 20
340
/
399
p each)		       172         46         95         141  
Repurchased and cancelled under share repurchase programme    
(7
) 
    
(2
) 
    
–
   
(2
) 
Exchange adjustments    
–
   
(1
) 
    
(1
) 
    
(2
) 
At 31 December 2024 (ordinary shares of 20
340
/
399
p each)
    
   165
   
   43
   
   94
   
   137
Summary of Shares Held By Employee Share Trusts
Shares held by employee share trusts
           Number of
shares
millions		         Carrying value
$m		             Market value
$m		  
31 December 2024
    
1.2
   
63.0
   
144.9
31 December 2023       0.8         35.0         73.6  
31 December 2022       1.1         37.0         62.8  
Treasury shares
Treasury shares
        
  Number of
shares
millions
        
  Nominal
value
$m
  
At 1 January 2022       3.7         1.0  
Transferred to employee share trusts       (0.7 )        (0.2 ) 
Repurchased under share repurchase programme       4.5         1.1  
At 31 December 2022       7.5         1.9  
Transferred to employee share trusts       (0.5 )        (0.1 ) 
Exchange adjustments       –         0.1  
At 31 December 2023       7.0         1.9  
Transferred to employee share trusts    
(0.8
) 
    
(0.2
) 
Exchange adjustments    
–
   
(0.1
) 
At 31 December 2024
    
6.2
   
1.6
Summary of Cash Flow Hedge Reserves
Cash flow hedge reserves
        
  Cash flow
hedge
reserve
$m
         
  Cost of
hedging
reserve
$m
                Total
$m		  
At 1 January 2022       16           (11 )              5  
Costs of hedging deferred and recognised in other comprehensive income       –           3               3  
Change in fair value of currency swaps recognised in other comprehensive income       33           –               33  
Reclassified from other comprehensive income to profit or loss – included in financial expenses       (43 )          –               (43 ) 
Deferred tax       2           –               2  
At 31 December 2022       8           (8 )              –  
Change in fair value of currency swaps recognised in other comprehensive income       (30 )          –               (30 ) 
Reclassified from other comprehensive income to profit or loss – included in financial expenses       28           –               28  
At 31 December 2023       6           (8 )              (2 ) 
Costs of hedging deferred and recognised in other comprehensive income    
–
     
(11
) 
          
(11
) 
Change in fair value of currency swaps recognised in other comprehensive income    
(113
) 
      
–
         
(113
) 
Reclassified from other comprehensive income to profit or loss – included in financial expenses    
165
     
–
         
165
Deferred tax
    
(11
)
      
–
         
(11
)
At 31 December 2024
    
47
     
(19
) 
          
28