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Goodwill - Schedule of Reconciliation of Changes in Goodwill (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year $ 2,184.3  
Goodwill, end of the year 2,346.4 $ 2,184.3
Gross    
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year 2,362.3 1,851.8
Acquisitions 64.7 532.8
Impact of foreign exchange 97.4 (22.3)
Goodwill, end of the year 2,524.4 2,362.3
Accumulated impairment    
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year (178.0)  
Goodwill, end of the year $ (178.0) $ (178.0)