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Net Interest Expense and Other Net Finance Expense - Schedule of Interest Expense (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net interest expense income [line items]    
Interest expense on lease liabilities $ 32.3  
Other 0.8 $ 1.1
Total interest expense 73.3 31.6
Interest income on FVOCI investment debt securities (2.5) (2.5)
Other (1.2) (0.4)
Total interest income (3.7) (2.9)
Net interest expense 69.6 28.7
Notes payable [member]    
Disclosure of net interest expense income [line items]    
Interest Expense 2.6 2.1
Revolving credit facilities [member]    
Disclosure of net interest expense income [line items]    
Interest Expense $ 37.6 $ 28.4