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Financial Instruments - Summary of Timing of Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables $ 567.2 $ 704.6
Long-term debt 935.4 740.8
Other financial liabilities 3.1 10.9
Total contractual obligations 1,505.7 1,456.3
Within one year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 567.2 704.6
Long-term debt 49.1 198.4
Other financial liabilities 1.1 1.8
Total contractual obligations 617.4 904.8
Later than one year and not later than three years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 196.7 541.4
Other financial liabilities 0.3 7.5
Total contractual obligations 197.0 548.9
After 3 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 689.6 1.0
Other financial liabilities 1.7 1.6
Total contractual obligations $ 691.3 $ 2.6