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Financial Instruments - Summary of Loss Allowance Provision (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.5 $ 2.1
Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount 1,356.9  
Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.9  
Current [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.07%  
Current [member] | Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 936.5  
Current [member] | Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.7  
Later than one month and not later than two months [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.10%  
Later than one month and not later than two months [member] | Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 228.7  
Later than one month and not later than two months [member] | Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.2  
Later than two months and not later than three months [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.22%  
Later than two months and not later than three months [member] | Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 63.8  
Later than two months and not later than three months [member] | Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.1  
Later than three months and not later than four months [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.43%  
Later than three months and not later than four months [member] | Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 43.2  
Later than three months and not later than four months [member] | Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.2  
Later than four months [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.75%  
Later than four months [member] | Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 84.7  
Later than four months [member] | Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 0.7