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Earnings/(loss) per ordinary share
 12 Months Ended
Dec. 31, 2022
Text Block [Abstract]  
Earnings/(loss) per ordinary share
10. Earnings/(loss) per ordinary share
 
Basic earnings/(loss) per ordinary share
  
 
 
  
        2022
 
  
 
 
  
        2021
 
  
 
 
  
2020
 
Profit/(loss) available for equity holders ($m)
            
 
375
 
            
 
266
 
            
 
(260
) 
Basic weighted average number of ordinary shares (millions)
            
 
181
 
            
 
183
 
            
 
182
 
Basic earnings/(loss) per ordinary share (cents)
            
 
207.2
 
            
 
145.4
 
            
 
(142.9
) 
             
Diluted earnings/(loss) per ordinary share
            
 
 
 
            
 
 
 
            
 
 
 
Profit/(loss) available for equity holders ($m)
            
 
375
 
            
 
266
 
            
 
(260
) 
Diluted weighted average number of ordinary shares (millions)
            
 
182
 
            
 
184
 
            
 
182
 
Diluted earnings/(loss) per ordinary share (cents)
            
 
206.0
 
            
 
144.6
 
            
 
(142.9)
 
Basic and diluted share denominators are calculated as follows:
 
            
2022
  millions
           
2021
  millions
           
2020
  millions
  
Weighted average number of ordinary shares in issue
            
 
187
 
           
 
187
 
           
 
187
 
Weighted average number of treasury shares
            
 
(6
) 
           
 
(4
) 
           
 
(5
) 
Basic weighted average number of ordinary shares
            
 
181
 
           
 
183
 
           
 
182
 
Dilutive potential ordinary shares
            
 
1
 
           
 
1
 
           
 
–
 
Diluted weighted average number of ordinary shares
            
 
182
 
           
 
184
 
           
 
182
 
On 9 August 2022, the Company announced a $500m share buyback which commenced on the same day (see note 28). This share repurchase represents a reduction in share capital with a corresponding change in resources hence earnings per share has not been restated for prior periods.