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Income Taxes - Significant Components of Net Deferred Income Tax Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets $ 45.2 $ 48.3  
Deferred tax liabilities (28.2) (77.5)  
Deferred tax assets (liabilities) 17.0 (29.2) $ (21.0)
Lease liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 159.4 166.7  
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 99.9 47.3  
Loss and tax credit carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 30.0 28.2  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1.9 1.5  
Employee defined benefit plan      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets   7.3  
Deferred tax liabilities (14.2)    
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 (18.3) (15.2)  
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 (130.9) (147.1)  
Lease assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities $ (110.8) $ (117.9)