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Capital Management - Net Debt (Details) - CAD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]      
Trade and other payables $ 281,404,000 $ 190,692,000  
Cash (5,464,000) 0 $ 0
Trade and other receivables (228,485,000) (173,409,000)  
Net Debt $ 987,446,000 $ 1,409,717,000  
Net Debt to Adjusted Funds Flow 0.8 1.9  
Unamortized debt issuance costs | Credit Facilities      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ 2,363,000 $ 1,343,000  
Unamortized debt issuance costs | Long-term notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings 6,999,000 11,393,000  
Cost | Credit Facilities      
Disclosure of detailed information about borrowings [line items]      
Borrowings (383,031,000) (505,171,000)  
Cost | Long-term notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings $ (547,598,000) $ (874,527,000)