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(Loss)/earnings per ordinary share (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of (Loss)/earnings per ordinary share
Continuing and total operations
  
2020
   2019   2018 
Basic (loss)/earnings per ordinary share
      
  
 
 
   
 
 
   
 
 
 
(Loss)/profit available for equity holders ($m)
  
 
(260
) 
   385    349 
  
 
 
   
 
 
   
 
 
 
Basic weighted average number of ordinary shares (millions)
  
 
182
 
   183    190 
  
 
 
   
 
 
   
 
 
 
Basic (loss)/earnings per ordinary share (cents)
  
 
(142.9
) 
   210.4    183.7 
  
 
 
   
 
 
   
 
 
 
Diluted (loss)/earnings per ordinary share
      
  
 
 
   
 
 
   
 
 
 
(Loss)/profit available for equity holders ($m)
  
 
(260
) 
   385    349 
  
 
 
   
 
 
   
 
 
 
Diluted weighted average number of ordinary shares (millions)
  
 
182
 
   184    192 
  
 
 
   
 
 
   
 
 
 
Diluted (loss)/earnings per ordinary share (cents)
  
 
(142.9
) 
   209.2    181.8 
  
 
 
   
 
 
   
 
 
 
Adjusted earnings per ordinary share
      
  
 
 
   
 
 
   
 
 
 
(Loss)/profit available for equity holders ($m)
  
 
(260
) 
   385    349 
  
 
 
   
 
 
   
 
 
 
Adjusting items:
      
  
 
 
   
 
 
   
 
 
 
System Fund revenues and expenses ($m)
   102    49    146 
  
 
 
   
 
 
   
 
 
 
Interest attributable to the System Fund ($m)
   (4)    (18)    (19) 
  
 
 
   
 
 
   
 
 
 
Operating exceptional items ($m) (note 6)
   270    186    104 
  
 
 
   
 
 
   
 
 
 
Exceptional financial expenses ($m) (note 6)
   14    —      —   
  
 
 
   
 
 
   
 
 
 
Change in fair value of contingent purchase consideration ($m) (note 25)
   (13)    (27)    4 
  
 
 
   
 
 
   
 
 
 
Tax on exceptional items ($m) (note 6)
   (52)    (20)    (22) 
  
 
 
   
 
 
   
 
 
 
Exceptional tax ($m) (note 6)
   —      —      (5) 
  
 
 
   
 
 
   
 
 
 
Adjusted earnings ($m)
  
 
57
 
   555    557 
  
 
 
   
 
 
   
 
 
 
Basic weighted average number of ordinary shares (millions)
  
 
182
 
   183    190 
  
 
 
   
 
 
   
 
 
 
Adjusted earnings per ordinary share (cents)
  
 
31.3
 
   303.3    293.2 
  
 
 
   
 
 
   
 
 
 
Adjusted diluted earnings per ordinary share
      
  
 
 
   
 
 
   
 
 
 
Adjusted earnings ($m)
  
 
57
 
   555    557 
  
 
 
   
 
 
   
 
 
 
Diluted weighted average number of ordinary shares (millions)
  
 
182
 
   184    192 
  
 
 
   
 
 
   
 
 
 
Adjusted diluted earnings per ordinary share (cents)
  
 
31.3
 
   301.6    290.1 
  
 
 
   
 
 
   
 
 
 
 
   
2020
millions
   2019
millions		   2018
millions		 
Diluted weighted average number of ordinary shares is calculated as:
      
  
 
 
   
 
 
   
 
 
 
Basic weighted average number of ordinary shares
   
182
    183    190 
  
 
 
   
 
 
   
 
 
 
Dilutive potential ordinary shares
   —      1    2 
  
 
 
   
 
 
   
 
 
 
   
182
   184   192