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Earnings/(loss) per ordinary share (Tables)
12 Months Ended
Dec. 31, 2022
Text Block [Abstract]  
Summary of 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