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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, 2018
Dec. 31, 2017
Disclosure of net interest expense income [line items]    
Interest on finance leases $ 0.5 $ 0.1
Other 0.6 1.7
Total interest expense 31.6 29.1
Interest income on FVOCI investment debt securities (2.5) (2.4)
Other (0.4) (0.8)
Total interest income (2.9) (3.2)
Net interest expense 28.7 25.9
Notes payable [member]    
Disclosure of net interest expense income [line items]    
Interest Expense 2.1 2.9
Revolving credit facilities [member]    
Disclosure of net interest expense income [line items]    
Interest Expense $ 28.4 $ 24.4