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Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Schedule of Commitments
     UNITED STATES DOLLAR  
     2017      2016      2015  

Capital expenditure

         

Contracted for

      44.5        46.2     

Operating leases2

         

- within one year

      66.6        42.5     

- later than one and not later than five years

      257.9        229.9     

- later than five years

      448.0        277.3     

 

         

 

  1 Refer note 40 for further details.
  2 The operating lease commitments consists mainly of power purchase agreements entered into at Tarkwa, Damang, Granny Smith and Gruyere. Included in these amounts are payments for non-lease elements of the arrangement.