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Goodwill - Schedule of Goodwill Allocated (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of information for cash-generating units [line items]    
Goodwill $ 2,184.3 $ 1,673.8
Cash-generating units    
Disclosure of information for cash-generating units [line items]    
Goodwill 2,184.3 1,673.8
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 1,304.9 963.1
Cash-generating units | Global    
Disclosure of information for cash-generating units [line items]    
Goodwill $ 519.9 $ 351.2