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Income Taxes - Schedule of Significant Components of Net Deferred Income Tax Assets (Liabilities) (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets $ 119.3 $ 92.6 $ 45.2  
Deferred tax liabilities (63.6) (26.4) [1] $ (35.0) [1]  
Deferred tax assets (liabilities) 55.7 66.2   $ 10.2
Lease liabilities        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 158.0 152.3    
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 198.7 154.4    
Loss and tax credit carryforwards        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 36.6 33.6    
Other        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax assets 2.9 1.7    
Employee defined benefit plan        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liabilities (16.9) (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 (24.7) (25.3)    
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 (192.8) (129.5)    
Right-of-use assets        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liabilities $ (106.1) $ (106.8)    
[1] Revised for change in accounting policy (see Note 6.c)