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Long-term Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Long-tem Incentive Plan
     UNITED STATES DOLLAR
     2017      2016
Restated1		     

2015

Restated1
          

Opening balance

      23.6        12.6     

 

Charge to income statement - continuing operations

      5.0        10.5     

 

Charge to income statement - discontinued operations

      0.1        0.5     

 

Payments

      (11.5 )       —       

 

Translation adjustment

      0.9        —       

 

Balance at end of the year

      18.1        23.6     

 

Current portion of long-term incentive plan

      (18.1 )       —       

 

Non-current portion of long-term incentive plan

      —          23.6