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Other Expense (Income) - Schedule of Other Expense (Income) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]    
Loss on sale of property and equipment $ 1.7 $ 0.2
Unrealized loss on equity securities 4.9  
Net realized gain on equity securities (0.9) (9.6)
Other (5.6) (0.6)
Total other expense (income) $ 0.1 $ (10.0)