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Goodwill - Schedule of Goodwill Allocated (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information for cash-generating units [line items]    
Goodwill $ 1,673.8 $ 1,651.8
Cash-generating units    
Disclosure of information for cash-generating units [line items]    
Goodwill 1,673.8 1,651.8
Cash-generating units | Canada    
Disclosure of information for cash-generating units [line items]    
Goodwill 359.5 358.2
Cash-generating units | United States    
Disclosure of information for cash-generating units [line items]    
Goodwill 963.1 956.0
Cash-generating units | Global    
Disclosure of information for cash-generating units [line items]    
Goodwill $ 351.2 $ 337.6