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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
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