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Cash and Cash Equivalents (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]      
Cash $ 194.4 $ 139.5  
Unrestricted investments 158.5 8.8  
Cash and cash equivalents $ 352.9 $ 148.3 $ 186.7