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Cash and Cash Equivalents (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]      
Cash $ 278.7 $ 208.1  
Cash in escrow 4.5 0.0  
Unrestricted investments 6.3 15.4  
Cash and deposits 289.5 223.5  
Bank indebtedness (4.7) (19.5)  
Cash and cash equivalents $ 284.8 $ 204.0 $ 185.2