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Lease Assets - Summary of Right-of-use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance $ 476.5  
Depreciation (122.1) $ (107.9)
Ending balance 470.4 476.5
Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 476.5 447.0
Additions 81.1 56.0
Acquisitions 8.5 79.9
Depreciation (122.1) (107.9)
Modifications 6.5 24.6
Impairment net of reversal 4.8 (19.1)
Foreign exchange 15.1 (4.0)
Ending balance 470.4 476.5
Building | Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 459.7 443.4
Additions 76.4 43.8
Acquisitions 8.3 74.0
Depreciation (115.9) (102.9)
Modifications 6.7 24.4
Impairment net of reversal 4.8 (19.1)
Foreign exchange 15.0 (3.9)
Ending balance 455.0 459.7
Other | Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 16.8 3.6
Additions 4.7 12.2
Acquisitions 0.2 5.9
Depreciation (6.2) (5.0)
Modifications (0.2) 0.2
Impairment net of reversal 0.0 0.0
Foreign exchange 0.1 (0.1)
Ending balance $ 15.4 $ 16.8