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Income Taxes - Significant Components of Net Deferred Income Tax Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets $ 42.4 $ 31.9  
Deferred tax liabilities (63.4) (73.2)  
Deferred income tax assets (liabilities) (21.0) (41.3) $ (21.6)
Lease liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 154.9 162.0  
Differences in timing of taxability of revenue and deductibility of expenses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 27.7 16.2  
Loss and tax credit carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 8.7 11.4  
Employee defined benefit plan      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 5.7 8.5  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1.2 1.1  
Carrying value of property and equipment in excess of tax cost      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (26.2) (22.7)  
Carrying value of intangible assets in excess of tax cost      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (84.3) (90.1)  
Lease assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities $ (108.7) $ (127.7)