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Lease Assets - Summary of Right-of-use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance $ 447.0  
Depreciation (107.9) $ (117.7)
Ending balance 476.5 447.0
Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 447.0 558.5
Additions 56.0 42.4
Acquisitions 79.9 7.0
Depreciation (107.9) (117.7)
Modifications 24.6 16.8
Impairment (19.1) (59.1)
Foreign exchange (4.0) (0.9)
Ending balance 476.5 447.0
Building | Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 443.4 554.4
Additions 43.8 40.7
Acquisitions 74.0 7.0
Depreciation (102.9) (115.0)
Modifications 24.4 16.4
Impairment (19.1) (59.1)
Foreign exchange (3.9) (1.0)
Ending balance 459.7 443.4
Other | Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 3.6 4.1
Additions 12.2 1.7
Acquisitions 5.9 0.0
Depreciation (5.0) (2.7)
Modifications 0.2 0.4
Impairment 0.0 0.0
Foreign exchange (0.1) 0.1
Ending balance $ 16.8 $ 3.6