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Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Summary of Equity Share Capital
 
        
Number
    of shares
millions
          
    Nominal
value
$m
          
Share
    premium
$m
          
Equity
share
        capital
$m
  
Allotted, called up and fully paid
      
 
  
 
 
 
   
 
 
 
   
 
  
 
  
 
 
 
   
 
 
 
At 1 January 2019 (ordinary shares of
19
17
⁄
21
p each)
      
197 
  
 
 
 
   
 
50
 
   
 
  
96 
  
 
 
 
   
 
146
 
Share capital consolidation
      
(10)
  
 
 
 
   
 
–
 
   
 
  
– 
  
 
 
 
   
 
–
 
Exchange adjustments
      
– 
  
 
 
 
   
 
2
 
   
 
  
3 
  
 
 
 
   
 
5
 
At 31 December 2019 (ordinary shares of
20
340
⁄
399
p each)
      
187 
  
 
 
 
   
 
52
 
   
 
  
99 
  
 
 
 
   
 
151
 
Exchange adjustments
      
– 
  
 
 
 
   
 
1
 
   
 
  
4 
  
 
 
 
   
 
5
 
At 31 December 2020 (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
 
Summary of Shares Held By Employee Share Trusts
 
         
Number of
shares
millions
    
          Carrying
value
$m
   
          Market
value
$m
  
31 December 2021
       
 
0.9
 
  
21.7
   
 
57.3
 
31 December 2020
       
 
0.1
 
  
1.4
   
 
3.1
 
31 December 2019
       
 
0.1
 
  
4.9
   
 
9.6
 
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 2019
      
(3)
   
 
(1
) 
  
(4)
Costs of hedging deferred and recognised in other comprehensive income
      
– 
   
 
(6
) 
  
(6)
Change in fair value of currency swaps recognised in other comprehensive income
      
(34)
   
 
–
 
  
(34)
Reclassified from other comprehensive income to profit or loss – included in financial expenses
      
38 
   
 
–
 
  
38 
At 31 December 2019
      
1 
   
 
(7
) 
  
(6)
Costs of hedging deferred and recognised in other comprehensive income
      
– 
   
 
(6
) 
  
(6)
Change in fair value of currency swaps recognised in other comprehensive income
      
(1)
   
 
–
 
  
(1)
Reclassified from other comprehensive income to profit or loss – included in financial expenses
      
(13)
   
 
–
 
  
(13)
Deferred tax
      
4 
   
 
–
 
  
4 
Exchange adjustments
      
(2)
   
 
–
 
  
(2)
At 31 December 2020
      
(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