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Earnings per ordinary share (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Earnings Per Ordinary Share

Continuing and total operations

    2018      2017
Restated		      2016
Restated		  

Basic earnings per ordinary share

         

Profit available for equity holders ($m)

      351        540        456  

Basic weighted average number of ordinary shares (millions)

      190        193        212  

Basic earnings per ordinary share (cents)

      184.7        279.8        215.1  
  

 

 

     

 

 

     

 

 

  

Diluted earnings per ordinary share

         

Profit available for equity holders ($m)

      351        540        456  

Diluted weighted average number of ordinary shares (millions)

      192        194        214  

Diluted earnings per ordinary share (cents)

      182.8        278.4        213.1  
  

 

 

     

 

 

     

 

 

  

Adjusted earnings per ordinary share

         

Profit available for equity holders ($m)

      351        540        456  

Adjusting items:

         

System Fund revenues and expenses ($m)

      146        34        (35 ) 

Interest attributable to the System Fund ($m) (note 7)

      (19 )       (13 )       (7 ) 

Tax attributable to the System Fund ($m)

      0        3        1  

Exceptional items before tax ($m) (note 6)

      104        (4 )       29  

Tax on exceptional items ($m) (note 6)

      (22 )       2        (12 ) 

Exceptional tax ($m) (note 6)

      (5 )       (90 )       —    
  

 

 

     

 

 

     

 

 

  

Adjusted earnings ($m)

      555        472        432  

Basic weighted average number of ordinary shares (millions)

      190        193        212  

Adjusted earnings per ordinary share (cents)

      292.1        244.6        203.8  
  

 

 

     

 

 

     

 

 

  

Adjusted diluted earnings per ordinary share

         

Adjusted earnings ($m)

      555        472        432  

Diluted weighted average number of ordinary shares (millions)

      192        194        214  

Adjusted diluted earnings per ordinary share (cents)

      289.1        243.3        201.9  
  

 

 

     

 

 

     

 

 

  
    

 

2018
millions

      2017
millions		      2016
millions		  

Diluted weighted average number of ordinary shares is calculated as:

         

Basic weighted average number of ordinary shares

      190        193        212  

Dilutive potential ordinary shares

      2        1        2  
  

 

 

     

 

 

     

 

 

  
     192        194        214