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Other Assets - Disclosure of the Bond Portfolio Stated at Fair Value (Details) - Bonds - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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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 | $ 104.4 | $ 124.4
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 | 1.3 | 17.3
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 | 45.7 | 104.8
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 | $ 57.4 | $ 2.3

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