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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents [abstract]      
Cash $ 208.1 $ 176.5  
Unrestricted investments 15.4 8.7  
Cash and deposits 223.5 185.2  
Bank indebtedness (19.5)    
Cash and cash equivalents $ 204.0 $ 185.2 $ 239.5