XML 170 R143.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes - Schedule of Loss Carryforwards (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences $ 13.0 $ 12.8
Non-capital tax losses [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses 100.8 88.5
Non-capital tax losses [member] | Expiry 2019 To 2038 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses 27.4 16.3
Non-capital tax losses [member] | Never expire [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses 73.4 72.2
Capital tax loss [member] | Never expire [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses 9.3 5.5
Non-capital and capital tax losses [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Capital tax losses $ 123.1 $ 106.8