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Financial Instruments - Summary of Loss Allowance Provision (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 2.2 $ 1.5
Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount 1,308.3 1,356.9
Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 2.8 $ 1.9
Current [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.10% 0.07%
Current [member] | Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 914.7 $ 936.5
Current [member] | Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.1 $ 0.7
Later than one month and not later than two months [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.13% 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 $ 221.1 $ 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 $ 0.2
Later than two months and not later than three months [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.30% 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 $ 63.5 $ 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 $ 0.2 $ 0.1
Later than three months and not later than four months [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 0.59% 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 $ 27.8 $ 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 $ 0.3 $ 0.2
Later than four months [member]    
Disclosure of provision matrix [line items]    
Expected loss rate 1.05% 0.75%
Later than four months [member] | Gross carrying amount [member]    
Disclosure of provision matrix [line items]    
Gross carrying amount $ 81.2 $ 84.7
Later than four months [member] | Accumulated impairment [member]    
Disclosure of provision matrix [line items]    
Loss allowance provision, end of the year $ 1.0 $ 0.7