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Issued share capital (Tables)
 6 Months Ended
Jun. 30, 2020
Text block [abstract]  
Disclosure Of Detailed Information About Issued Share Capital Explanatory
 
    
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