XML 17 R10.htm IDEA: XBRL DOCUMENT v3.8.0.1
Revenue
12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Revenue
1. REVENUE

 

     UNITED STATES DOLLAR  
     2017      2016      2015  
            Restated1      Restated1  

Revenue from mining operations

     2,761.8        2,666.4        2,454.1