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Lease Assets - Schedule of Right-of-use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance $ 470.4  
Depreciation (121.7) $ (122.1)
Ending balance 442.9 470.4
Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 470.4 476.5
Additions 48.3 81.1
Acquisitions 15.0 8.5
Depreciation (121.7) (122.1)
Modifications 33.6 6.5
Reversal of impairment, net 1.6 4.8
Foreign exchange (4.3) 15.1
Ending balance 442.9 470.4
Building | Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 455.0 459.7
Additions 45.4 76.4
Acquisitions 14.6 8.3
Depreciation (114.7) (115.9)
Modifications 33.3 6.7
Reversal of impairment, net 1.6 4.8
Foreign exchange (4.2) 15.0
Ending balance 431.0 455.0
Other | Lease assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 15.4 16.8
Additions 2.9 4.7
Acquisitions 0.4 0.2
Depreciation (7.0) (6.2)
Modifications 0.3 (0.2)
Reversal of impairment, net 0.0 0.0
Foreign exchange (0.1) 0.1
Ending balance $ 11.9 $ 15.4