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Other liabilities (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Liabilities [Abstract]    
Deferred sales $ 14,382 $ 17,418
Derivatives 4,733 12,524
Accrued pension and post-retirement benefit liability 91,729 80,737
Lease obligation 7,951 12,869
Product loan 6,045 0
Other 67,838 63,452
Total other liabilities 192,678 187,000
Less current portion (26,119) (33,073)
Net $ 166,559 $ 153,927
Disclosure of quantitative information about leases for lessee [Abstract]    
Short-term leases Expenses related to short-term leases and leases of low-value assets were insignificant during 2020.  
Low-value leases Expenses related to short-term leases and leases of low-value assets were insignificant during 2020.