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Other Financial Assets - Disclosure of the Bond Portfolio Stated at Fair Value (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Maturity of bond portfolio, stated fair value CAD 97.7 CAD 93.0
Within one year [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Maturity of bond portfolio, stated fair value 5.6 18.6
2018 to 2022 [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Maturity of bond portfolio, stated fair value 73.5 64.8
More than five years [member]    
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Maturity of bond portfolio, stated fair value CAD 18.6 CAD 9.6