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Lease Assets - Impairment losses and Related Recoverable Amounts for Reportable Segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment reversals $ (8.1) $ (5.8)
Net impairment of lease assets and property and equipment (5.5) 24.8
Recoverable amount 4.3 7.9
Canada | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment reversals (2.5) (3.8)
Net impairment of lease assets and property and equipment (2.4) 8.6
Recoverable amount 0.0 0.0
United States | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment reversals (3.4) (1.2)
Net impairment of lease assets and property and equipment (3.1) 16.2
Recoverable amount 0.0 6.8
Global | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment reversals (2.2) (0.8)
Net impairment of lease assets and property and equipment 0.0 0.0
Recoverable amount 4.3 1.1
Lease assets    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 2.6 23.7
Lease assets | Canada | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 0.1 10.5
Lease assets | United States | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 0.3 12.6
Lease assets | Global | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses $ 2.2 0.6
Property and equipment    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses   6.9
Property and equipment | Canada | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses   1.9
Property and equipment | United States | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses   4.8
Property and equipment | Global | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses   $ 0.2