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Other Assets - Disclosure of the Bond Portfolio Stated at Fair Value (Detail) - Bonds [member] - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Maturity of bond portfolio, stated fair value $ 103.0 $ 97.7
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 14.0 5.6
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 85.2 73.5
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 $ 3.8 $ 18.6