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Other Assets - Schedule of Fair Value and Amortized Cost (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of investments held for self insured liabilities at fair value and amortized cost [line items]    
Fair Value $ 204.5 $ 156.8
Amortized Cost/Cost 191.3 156.9
Bonds    
Disclosure of investments held for self insured liabilities at fair value and amortized cost [line items]    
Fair Value 127.2 104.4
Amortized Cost/Cost 125.0 105.1
Equity securities    
Disclosure of investments held for self insured liabilities at fair value and amortized cost [line items]    
Fair Value 77.3 52.4
Amortized Cost/Cost $ 66.3 $ 51.8