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Other Assets - Disclosure of the Bond Portfolio Stated at Fair Value (Details) - Bonds - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Maturity of bond portfolio, stated at fair value | $ 115.5 | $ 102.8
Within one year |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Maturity of bond portfolio, stated at fair value | 31.4 | 9.5
After one year but not more than five years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Maturity of bond portfolio, stated at fair value | 77.5 | 79.9
More than five years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Maturity of bond portfolio, stated at fair value | $ 6.6 | $ 13.4

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