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Income Taxes - Schedule of Loss Carryforwards (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences $ 9.2 $ 13.0
Non-capital tax losses [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses 109.0 100.8
Non-capital tax losses [member] | Expiry 2020 To 2039 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses 37.8 27.4
Non-capital tax losses [member] | Never expire [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses 71.2 73.4
Capital tax loss [member] | Never expire [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses 6.8 9.3
Non-capital and capital tax losses [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses $ 125.0 $ 123.1