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Lease Assets - Summary of Right-of-use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance $ 558.5  
Depreciation (117.7) $ (115.8)
Ending balance 447.0 558.5
Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 558.5 561.8
Additions 42.4 65.5
Acquisitions 7.0 19.4
Depreciation (117.7) (115.8)
Modifications 16.8 42.6
Impairment (59.1) (2.0)
Foreign exchange (0.9) (13.0)
Ending balance 447.0 558.5
Buildings | Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 554.4 556.6
Additions 40.7 63.9
Acquisitions 7.0 19.3
Depreciation (115.0) (113.2)
Modifications 16.4 42.6
Impairment (59.1) (2.0)
Foreign exchange (1.0) (12.8)
Ending balance 443.4 554.4
Other | Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 4.1 5.2
Additions 1.7 1.6
Acquisitions 0.0 0.1
Depreciation (2.7) (2.6)
Modifications 0.4 0.0
Impairment 0.0 0.0
Foreign exchange 0.1 (0.2)
Ending balance $ 3.6 $ 4.1