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Lease Assets - Schedule of Right-of-use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance $ 442.9  
Depreciation (127.1) $ (121.7)
Ending balance 474.3 442.9
Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 442.9 470.4
Additions 70.9 48.3
Acquisitions 60.8 15.0
Depreciation (127.1) (121.7)
Modifications 37.1 33.6
Reversal of impairment, net (29.0) 1.6
Foreign exchange 18.7 (4.3)
Ending balance 474.3 442.9
Building | Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 431.0 455.0
Additions 60.3 45.4
Acquisitions 56.8 14.6
Depreciation (117.7) (114.7)
Modifications 36.4 33.3
Reversal of impairment, net (29.0) 1.6
Foreign exchange 17.0 (4.2)
Ending balance 454.8 431.0
Other | Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 11.9 15.4
Additions 10.6 2.9
Acquisitions 4.0 0.4
Depreciation (9.4) (7.0)
Modifications 0.7 0.3
Reversal of impairment, net 0.0 0.0
Foreign exchange 1.7 (0.1)
Ending balance $ 19.5 $ 11.9