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Cash and Cash Equivalents (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]      
Cash $ 139.5 $ 183.9  
Unrestricted investments 8.8 10.0  
Cash and deposits 148.3 193.9  
Bank indebtedness 0.0 (7.2)  
Cash and cash equivalents $ 148.3 $ 186.7 $ 284.8