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Lease Assets - Impairment losses and Related Recoverable Amounts for Reportable Segments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses $ 78.6
Recoverable amount 12.0
Canada | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 66.7
Recoverable amount 8.4
United States | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 6.5
Recoverable amount 1.2
Global | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 5.4
Recoverable amount 2.4
Lease assets  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 59.1
Lease assets | Canada | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 50.4
Lease assets | United States | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 4.8
Lease assets | Global | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 3.9
Property and equipment  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 19.5
Property and equipment | Canada | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 16.3
Property and equipment | United States | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses 1.7
Property and equipment | Global | Reportable segments  
Disclosure of impairment loss and reversal of impairment loss [line items]  
Impairment losses $ 1.5