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Goodwill - Schedule of Reconciliation of Changes in Goodwill (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year [1] $ 2,073.6  
Goodwill, end of the year 2,712.5 $ 2,073.6 [1]
Gross    
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year 2,193.4 2,152.4
Acquisitions 503.0 74.2
Impact of foreign exchange 135.9 (33.2)
Goodwill, end of the year 2,832.3 2,193.4
Accumulated impairment    
Reconciliation of changes in goodwill [abstract]    
Goodwill, beginning of the year (119.8)  
Goodwill, end of the year $ (119.8) $ (119.8)
[1] Revised for change in accounting policy (see Note 6.c)