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Issued share capital (Tables)
 6 Months Ended
Jun. 30, 2019
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Six months
ended

30 June

2019

     

Six months

ended

30 June

2018

     

Year ended

31 December

2018

  
Number of equity ordinary shares    m      m      m  

At the beginning of the period

      1,332.7        1,332.5        1,332.5  

Exercise of share options

      —          0.1        0.2  

At the end of the period

      1,332.7        1,332.6        1,332.7