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Goodwill - Schedule of Goodwill Allocated (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of information for cash-generating units [line items]    
Goodwill $ 2,384.0 $ 2,346.4
Cash-generating units    
Disclosure of information for cash-generating units [line items]    
Goodwill 2,384.0 2,346.4
Cash-generating units | Canada    
Disclosure of information for cash-generating units [line items]    
Goodwill 359.5 359.5
Cash-generating units | United States    
Disclosure of information for cash-generating units [line items]    
Goodwill 1,452.4 1,408.0
Cash-generating units | Foreign countries [member]    
Disclosure of information for cash-generating units [line items]    
Goodwill $ 572.1 $ 578.9