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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 96.8 $ 81.9
Unrecognized tax liabilities 17.8 $ 13.4
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 113.3  
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 22.8  
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 19.4  
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 $ 4.3