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Financial instruments (Liquidity Risk Tables) (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount $ 1,439,343 $ 1,346,577
Contractual cash flows 1,443,370  
Total interest payments on long-term debt 192,225  
Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 403,308  
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 533,164  
Total interest payments on long-term debt 44,255  
Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 403,578  
Total interest payments on long-term debt 33,780  
Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 103,320  
Total interest payments on long-term debt 76,350  
Accounts Payable And Accrued Liabilities [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 374,714  
Contractual cash flows 374,714  
Accounts Payable And Accrued Liabilities [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 374,714  
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 997,000  
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 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 100,000  
Foreign currency contracts [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 51,058  
Contractual cash flows 51,058  
Foreign currency contracts [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 23,476  
Foreign currency contracts [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 27,582  
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  
Interest rate contracts [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 7,284  
Contractual cash flows 7,284  
Interest rate contracts [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 2,437  
Interest rate contracts [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 2,987  
Interest rate contracts [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 1,860  
Interest rate 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 9,287  
Contractual cash flows 10,314  
Lease Obligation [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 2,681  
Lease Obligation [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 2,595  
Lease Obligation [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 1,718  
Lease Obligation [Member] | Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 3,320  
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 1,756,754  
Committed and outstanding 1,593,379  
Available borrowing facility $ 163,375