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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
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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

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