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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents [abstract]      
Cash $ 176.5 $ 234.7  
Unrestricted investments 8.7 4.8  
Cash and cash equivalents $ 185.2 $ 239.5 $ 210.9