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Financial Instruments - Summary of Timing of Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other payables CAD 704.6 CAD 718.1
Long-term debt 740.8 1,023.0
Other financial liabilities 10.9 10.0
Total contractual obligations 1,456.3 1,751.1
Within one year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Trade and other payables 704.6 718.1
Long-term debt 198.4 92.4
Other financial liabilities 1.8 2.4
Total contractual obligations 904.8 812.9
Later than one year and not later than three years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Long-term debt 541.4 929.5
Other financial liabilities 7.5 7.6
Total contractual obligations 548.9 937.1
After 3 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Long-term debt 1.0 1.1
Other financial liabilities 1.6  
Total contractual obligations CAD 2.6 CAD 1.1