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Goodwill - Schedule of Reconciliation of Changes in Goodwill (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year $ 2,346.4  
Goodwill, end of the year 2,384.0 $ 2,346.4
Gross    
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year 2,524.4 2,362.3
Acquisitions 74.2 64.7
Impact of foreign exchange (36.6) 97.4
Goodwill, end of the year 2,562.0 2,524.4
Accumulated impairment    
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year (178.0)  
Goodwill, end of the year $ (178.0) $ (178.0)