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Issued share capital
 6 Months Ended
Jun. 30, 2020
Text block [abstract]  
Issued share capital
19
.
Issued share capital
 
    
Six months
ended
30 June
2020
   
Six months
ended
30 June
2019
   
Year ended
31 December
2019
 
Number of equity ordinary shares
  
m
   
m
   
m
 
At the beginning of the period
   1,328.2    1,332.7    1,332.7 
Share cancellations
   (32.1)    —      (4.5) 
At the end of the period
   1,296.1    1,332.7    1,328.2