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Financial instruments - Liquidity Risk Tables (Details) - CAD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount $ 1,815,869 $ 1,904,691
Contractual cash flows 1,821,398  
Total interest payments on long-term debt 405,600  
Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 309,233  
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 512,165  
Total interest payments on long-term debt 110,430  
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 82,080  
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 143,700  
Accounts Payable and Accrued Liabilities [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 258,405  
Contractual cash flows 258,405  
Accounts Payable and Accrued Liabilities [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 258,405  
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  
Dividends Payable [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 39,579  
Contractual cash flows 39,579  
Dividends Payable [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 39,579  
Dividends Payable [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Dividends Payable [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 0  
Dividends Payable [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 1,494,471  
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 0  
Long-Term Debt [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 500,000  
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 5,624  
Contractual cash flows 5,624  
Foreign currency contracts [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 1,747  
Foreign currency contracts [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 3,877  
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 17,790  
Contractual cash flows 17,790  
Other Derivative Liabilities [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 9,502  
Other Derivative Liabilities [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 8,288  
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 1,667,932  
Committed and outstanding 1,474,155  
Available borrowing facility $ 193,777