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Other (Income) Expense - Schedule of Other (Income) Expense (Detail) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]    
Loss on sale of property and equipment CAD 0.2 CAD 1.5
Realized gain on available-for-sale equity securities (9.6)  
Other (0.6) (1.3)
Total other (income) expense CAD (10.0) CAD 0.2