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

Listed

      

Cost

      143.0        62.9  

Less: Accumulated impairments

      (45.5 )       (45.0 ) 

Net unrealised loss on revaluation

      (8.1 )       (7.4 ) 

Translation adjustment

      9.6        —    
  

 

 

     

 

 

  

Carrying value

      99.0        10.5  
  

 

 

     

 

 

  

Market value

      99.0        10.5  
  

 

 

     

 

 

  

Unlisted

      

Carrying value at cost

      0.1        3.3  
  

 

 

     

 

 

  

Derivative instruments

      

Warrants2

      5.5        5.9  
  

 

 

     

 

 

  

Total investments1

      104.6        19.7  
  

 

 

     

 

 

  

 

1 All listed investments are classified as available for sale. Refer note 42 for details of major investments.
2 Consists of 10.0 million common share purchase warrants of Maverix. Refer note 15.1 for further details.