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Issued share capital (Tables)
 6 Months Ended
Jun. 30, 2018
Text block1 [abstract]  
Options Granted
     

Six months
ended

30 June

2018

     

Six months

ended

30 June

2017

     

Year ended

31 December

2017

  
Number of equity ordinary shares    m      m      m  

At the beginning of the period

      1,332.5        1,331.9        1,331.9  

Exercise of share options

      0.1        0.4        0.6  

At the end of the period

      1,332.6        1,332.3        1,332.5