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Financial instruments (Liquidity Risk Tables) (Details) - CAD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]    
Committed and outstanding $ 1,784,174 $ 997,000
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 2,394,884 $ 1,439,343
Contractual cash flows 2,407,411  
Total interest payments on long-term debt 299,775  
Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 1,094,188  
Total interest payments on long-term debt 85,322  
Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 805,112  
Total interest payments on long-term debt 121,213  
Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 403,423  
Total interest payments on long-term debt 21,980  
Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 104,688  
Total interest payments on long-term debt 71,260  
Accounts Payable And Accrued Liabilities [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Carrying amount 577,550  
Contractual cash flows 577,550  
Accounts Payable And Accrued Liabilities [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 577,550  
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 1,784,174  
Contractual cash flows 1,794,580  
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 794,580  
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 16,525  
Contractual cash flows 16,525  
Foreign currency contracts [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 11,762  
Foreign currency contracts [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 4,763  
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 5,819  
Contractual cash flows 5,819  
Interest rate contracts [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 2,576  
Interest rate contracts [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 2,437  
Interest rate contracts [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 806  
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 10,816  
Contractual cash flows 12,937  
Lease Obligation [Member] | Due in less than one year [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 2,300  
Lease Obligation [Member] | Due in one to three years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 3,332  
Lease Obligation [Member] | Due in three to five years [Member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 2,617  
Lease Obligation [Member] | Due after five years [member]    
Disclosure of maturity analysis for financial liabilities [abstract]    
Contractual cash flows 4,688  
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 1,771,663  
Committed and outstanding 1,383,689  
Available borrowing facility $ 387,974