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Long-Term Debt - Future Minimum Lease Payments and Present Value of the Net Minimum Lease Payments under Finance Leases (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [Line Items]    
Total minimum lease payments $ 19.8 $ 10.5
Less amounts representing finance charges 0.3 0.1
Present value of minimum lease payments 19.5 10.4
Within one year [member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Total minimum lease payments 10.0 7.4
2018 to 2022 [member]    
Disclosure of finance lease and operating lease by lessee [Line Items]    
Total minimum lease payments $ 9.8 $ 3.1