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Goodwill - Schedule of Reconciliation of Changes in Goodwill (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance $ 1,651.8  
Ending balance 1,673.8 $ 1,651.8
Gross    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance 1,829.8 1,799.2
Acquisitions 31.4 90.1
Impact of foreign exchange (9.4) (59.5)
Ending balance 1,851.8 1,829.8
Accumulated impairment    
Disclosure of reconciliation of changes in goodwill [line items]    
Beginning balance (178.0)  
Ending balance $ (178.0) $ (178.0)