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Financial Instruments - Summary of Timing of Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Bank indebtedness $ 19.5  
Trade and other payables 576.4 $ 567.2
Lease liabilities 810.5  
Long-term debt 863.0 935.4
Software financing obligations 4.8 3.1
Total contractual obligations 2,274.2 1,505.7
Within one year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Bank indebtedness 19.5  
Trade and other payables 576.4 567.2
Lease liabilities 138.5  
Long-term debt 47.2 49.1
Software financing obligations 0.9 1.1
Total contractual obligations 782.5 617.4
Later than one year and not later than three years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 0.0  
Lease liabilities 255.0  
Long-term debt 366.9 196.7
Software financing obligations 1.8 0.3
Total contractual obligations 623.7 197.0
After 3 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Trade and other payables 0.0  
Lease liabilities 417.0  
Long-term debt 448.9 689.6
Software financing obligations 2.1 1.7
Total contractual obligations $ 868.0 $ 691.3