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Other Assets - Disclosure of the Bond Portfolio Stated at Fair Value (Detail) - Bonds [member] - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Maturity of bond portfolio, stated fair value $ 102.8 $ 103.0
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 9.5 14.0
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 79.9 85.2
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 $ 13.4 $ 3.8