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Income Taxes - Schedule of Significant Components of Net Deferred Income Tax Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets $ 92.6 $ 45.2  
Deferred tax liabilities (24.4) (28.2)  
Deferred tax assets (liabilities) 68.2 17.0 $ (29.2)
Lease liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 152.3 159.4  
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 156.4 99.9  
Loss and tax credit carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 33.6 30.0  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 1.7 1.9  
Employee defined benefit plan      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities (14.2) (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 (25.3) (18.3)  
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 (129.5) (130.9)  
Lease assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities $ (106.8) $ (110.8)