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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 77.8 $ 100.7
Unrecognized tax liabilities 6.1 $ 24.2
Canada [Member] | Non-capital losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 80.8  
Mexico [Member] | Non-capital losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 43.6  
United States [Member] | Non-capital losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 20.3  
Turkey [Member] | Non-capital losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised $ 7.1