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Trade and Other Receivables - Schedule of Gross Trade Receivables Aging Analysis (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Trade and other receivables [line items]    
Trade receivables $ 776.0 $ 748.7
1-30 Days [member]    
Trade and other receivables [line items]    
Trade receivables 355.6 403.1
31-60 Days [member]    
Trade and other receivables [line items]    
Trade receivables 228.7 182.4
61-90 Days [member]    
Trade and other receivables [line items]    
Trade receivables 63.8 53.9
91-120 Days [member]    
Trade and other receivables [line items]    
Trade receivables 43.2 29.1
121+ Days [member]    
Trade and other receivables [line items]    
Trade receivables $ 84.7 $ 80.2