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Financial instruments - Liquidity Risk Tables (Details) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount $ 1,781,812 $ 1,815,869
Contractual cash flows 1,786,141  
Total interest payments on long-term debt 336,210  
Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 760,288  
Total interest payments on long-term debt 69,390  
Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 25,853  
Total interest payments on long-term debt 82,080  
Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 400,000  
Total interest payments on long-term debt 67,080  
Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 600,000  
Total interest payments on long-term debt 117,660  
Accounts Payable and Accrued Liabilities [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 224,754  
Contractual cash flows 224,754  
Accounts Payable and Accrued Liabilities [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 224,754  
Accounts Payable and Accrued Liabilities [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Accounts Payable and Accrued Liabilities [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Accounts Payable and Accrued Liabilities [Member] | Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Long-Term Debt [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 1,495,671  
Contractual cash flows 1,500,000  
Long-Term Debt [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 500,000  
Long-Term Debt [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Long-Term Debt [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 400,000  
Long-Term Debt [Member] | Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 600,000  
Foreign currency contracts [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 54,866  
Contractual cash flows 54,866  
Foreign currency contracts [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 29,013  
Foreign currency contracts [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 25,853  
Foreign currency contracts [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Foreign currency contracts [Member] | Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Other Derivative Liabilities [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 6,521  
Contractual cash flows 6,521  
Other Derivative Liabilities [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 6,521  
Other Derivative Liabilities [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Other Derivative Liabilities [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Other Derivative Liabilities [Member] | Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Unsecured revolving credit facility [Member]    
Disclosure of detailed information about borrowings [line items]    
Maximum borrowing capacity 1,250,000  
Committed and outstanding 0  
Available borrowing facility 1,250,000  
Letter of credit facilities [Member]    
Disclosure of detailed information about borrowings [line items]    
Maximum borrowing capacity 1,716,473  
Committed and outstanding 1,572,984  
Available borrowing facility $ 143,489