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Financial instruments - Liquidity Risk Tables (Details) - CAD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount $ 1,241,874 $ 1,203,910
Contractual cash flows 1,246,907  
Total interest payments on long-term debt 267,905  
Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 238,964  
Total interest payments on long-term debt 37,840  
Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 6,971  
Total interest payments on long-term debt 75,680  
Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 500,972  
Total interest payments on long-term debt 44,255  
Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 500,000  
Total interest payments on long-term debt 110,130  
Accounts Payable and Accrued Liabilities [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 233,649  
Contractual cash flows 233,649  
Accounts Payable and Accrued Liabilities [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 233,649  
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 995,541  
Contractual cash flows 1,000,000  
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 0  
Long-Term Debt [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 500,000  
Long-Term Debt [Member] | Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 500,000  
Foreign currency contracts [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 4,733  
Contractual cash flows 4,733  
Foreign currency contracts [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 1,658  
Foreign currency contracts [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 3,075  
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  
Lease obligation [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 7,951  
Contractual cash flows 8,525  
Lease obligation [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 3,657  
Lease obligation [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 3,896  
Lease obligation [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 972  
Lease obligation [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 1,000,000  
Committed and outstanding 0  
Available borrowing facility 1,000,000  
Letter of credit facilities [Member]    
Disclosure of detailed information about borrowings [line items]    
Maximum borrowing capacity 1,698,340  
Committed and outstanding 1,596,488  
Available borrowing facility $ 101,852