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Equity (Tables)
 12 Months Ended
Dec. 31, 2022
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 2020 (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
 
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
 
Summary of Shares Held By Employee Share Trusts
            
Number of
shares
millions
            
  Carrying
value
$m
     
          Market
value
$m
  
31 December 2022
            
 
1.1
 
            
 
37.0
 
   
 
62.8
 
31 December 2021
            
 
0.9
 
            
 
21.7
 
   
 
57.3
 
31 December 2020
            
 
0.1
 
            
 
1.4
 
   
 
3.1
 
Summary of Cash Flow Hedge Reserves
            
Cash flow
hedge
reserve
$m
    
Cost of
    hedging
reserve
$m
    
            Total
$m
  
At 1 January 2020
            
 
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
 
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
) 
  
 
–
 
Treasury shares Treasury shares
 
            
Number of
shares
millions
           
    Nominal
value
$m
  
At 1 January 2020
            
 
5.7
 
           
 
1.6
 
Transferred to employee share trusts
            
 
(0.6
) 
           
 
(0.2
) 
At 31 December 2020
            
 
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