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Lease Assets - Impairment losses and Related Recoverable Amounts for Reportable Segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses $ 24.8 $ 78.6
Impairment reversals (5.8)  
Recoverable amount 7.9 12.0
Canada | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 8.6 66.7
Impairment reversals (3.8)  
Recoverable amount 0.0 8.4
United States | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 16.2 6.5
Impairment reversals (1.2)  
Recoverable amount 6.8 1.2
Global | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 0.0 5.4
Impairment reversals (0.8)  
Recoverable amount 1.1 2.4
Lease assets    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 23.7 59.1
Lease assets | Canada | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 10.5 50.4
Lease assets | United States | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 12.6 4.8
Lease assets | Global | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 0.6 3.9
Property and equipment    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 6.9 19.5
Property and equipment | Canada | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 1.9 16.3
Property and equipment | United States | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses 4.8 1.7
Property and equipment | Global | Reportable segments    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment losses $ 0.2 $ 1.5