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Trade and Other Receivables - Schedule of Gross Trade Receivables Aging Analysis (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Trade and other receivables [line items]    
Trade receivables $ 789.5 $ 776.0
1-30 Days [member]    
Trade and other receivables [line items]    
Trade receivables 395.9 355.6
31-60 Days [member]    
Trade and other receivables [line items]    
Trade receivables 221.1 228.7
61-90 Days [member]    
Trade and other receivables [line items]    
Trade receivables 63.5 63.8
91-120 Days [member]    
Trade and other receivables [line items]    
Trade receivables 27.8 43.2
121+ Days [member]    
Trade and other receivables [line items]    
Trade receivables $ 81.2 $ 84.7