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Other Assets - Disclosure of the Bond Portfolio Stated at Fair Value (Details) - Bonds - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]    
Maturity of bond portfolio, stated at fair value $ 124.4 $ 115.5
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 17.3 31.4
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 104.8 77.5
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 $ 2.3 $ 6.6