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Equity (Tables)
 12 Months Ended
Dec. 31, 2023
Text Block [Abstract]  
Summary of 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 2021 (ordinary shares of 20
340
/
399
p each)
      
 
187
 
     
 
53
 
  
 
103
 
  
 
156
 
Exchange adjustments
      
 
–
 
     
 
–
 
  
 
(2
) 
  
 
(2
) 
At 31 December 2021 (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
 
Summary of Shares Held By Employee Share Trusts
            
Number of
shares
millions
           
  Carrying
value
$m
    
      Market
value
$m
  
31 December 2023
      
 
0.8
  
     
 
35.0
  
  
 
73.6
  
31 December 2022
      
 
1.1
 
     
 
37.0
 
  
 
62.8
 
31 December 2021
      
 
0.9
 
     
 
21.7
 
  
 
57.3
 
Summary of Cash Flow Hedge Reserves
            
Cash flow
hedge
reserve
$m
    
Cost of
  hedging
reserve
$m
    
   Total
$m
  
At 1 January 2021
      
 
(11
) 
  
 
(13
) 
  
 
(24
) 
Costs of hedging deferred and recognised in other comprehensive income
      
 
–
 
  
 
2
 
  
 
2
 
Change in fair value of currency swaps recognised in other comprehensive income
      
 
(62
) 
  
 
–
 
  
 
(62
) 
Reclassified from other comprehensive income to profit or loss – included in financial expenses
      
 
96
 
  
 
–
 
  
 
96
 
Deferred tax
      
 
(7
) 
  
 
–
 
  
 
(7
) 
At 31 December 2021
      
 
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
) 
Treasury shares
Treasury shares
 
            
Number of
shares
millions
           
  Nominal
value
$m
  
At 1 January 2021
      
 
5.1
 
     
 
1.4
 
Transferred to employee share trusts
      
 
(1.4
) 
     
 
(0.4
) 
At 31 December 2021
      
 
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