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Lease Assets - Schedule of Impairment losses and Related Recoverable Amounts for Reportable Segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Impairment losses    
Impairment reversals $ (1.1)  
Net impairment of lease assets and property and equipment 34.9 $ 0.3
Recoverable amount remaining 1.3  
Right-of-use assets    
Impairment losses    
Lease assets 29.9  
Property, plant and equipment    
Impairment losses    
Property and equipment 6.1  
Canada    
Impairment losses    
Impairment reversals (0.4)  
Net impairment of lease assets and property and equipment 17.4  
Recoverable amount remaining 0.0  
Canada | Right-of-use assets    
Impairment losses    
Lease assets 12.6  
Canada | Property, plant and equipment    
Impairment losses    
Property and equipment 5.2  
United States    
Impairment losses    
Impairment reversals (0.6)  
Net impairment of lease assets and property and equipment 14.7  
Recoverable amount remaining 0.0  
United States | Right-of-use assets    
Impairment losses    
Lease assets 14.9  
Property and equipment   2.1
United States | Property, plant and equipment    
Impairment losses    
Property and equipment 0.4 2.6
Global    
Impairment losses    
Impairment reversals (0.1)  
Net impairment of lease assets and property and equipment 2.8  
Recoverable amount remaining 1.3 $ 2.8
Global | Right-of-use assets    
Impairment losses    
Lease assets 2.4  
Global | Property, plant and equipment    
Impairment losses    
Property and equipment $ 0.5