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Other Assets - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of investments held for self insured liabilities maturity of bond portfolio at fair value [line items]    
Unrealized gains on equity securities $ 13.9 $ 0.7
Bottom of range    
Disclosure of investments held for self insured liabilities maturity of bond portfolio at fair value [line items]    
Bonds interest rate 0.80% 0.88%
Top of range    
Disclosure of investments held for self insured liabilities maturity of bond portfolio at fair value [line items]    
Bonds interest rate 4.55% 4.25%