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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2016
Financial Instruments Tables  
Concentration of sales
      2016       2015  
Customer A     0.4       23.2  
Customer B     2.7       22.3  
Customer C     65.8       19.1  
Customer D     7.5       12.0  
                 
      76.4       76.6