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Dividends
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Dividends
    
 
9. Dividends
 
        
2021
        
2020
         
2019
  
         
cents
  per share
     
                  $m
        
cents
  per share
   
                  $m
         
cents
  per share
     
                  $m
  
Paid during the year
       
 
 
 
   
 
 
 
      
 
   
 
 
 
       
 
 
 
   
 
 
 
Final (declared for previous year)
       
 
–
 
   
 
–
 
      
–
   
 
–
 
       
 
78.1
 
   
 
139
 
Interim
       
 
–
 
   
 
–
 
      
–
   
 
–
 
       
 
39.9
 
   
 
72
 
Special (note 29)
       
 
–
 
   
 
–
 
      
–
   
 
–
 
       
 
262.1
 
   
 
510
 
 
       
 
–
 
   
 
–
 
      
–
   
 
–
 
       
 
380.1
 
   
 
721
 
The final dividend of 85.9¢ per ordinary share (amounting to $157m) is proposed for approval at the AGM on 6 May 2022. No dividends were paid in 2021 or 2020.