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Other Assets - Summary of Fair Value and Amortized Cost (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of investments held for self insured liabilities at fair value and amortized cost [line items]    
Fair Value $ 156.8 $ 198.3
Amortized Cost/Cost 156.9 179.8
Bonds    
Disclosure of investments held for self insured liabilities at fair value and amortized cost [line items]    
Fair Value 104.4 124.4
Amortized Cost/Cost 105.1 124.5
Equity securities    
Disclosure of investments held for self insured liabilities at fair value and amortized cost [line items]    
Fair Value 52.4 73.9
Amortized Cost/Cost $ 51.8 $ 55.3