Financial instruments - Additional Information (Details) - CAD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	$ 287,200	$ 357,200
Percentage of trade and other current receivables	3.60%	0.70%
Long-term debts [Member]
Disclosure of detailed information about financial instruments [line items]
Fair value of long-term debt	$ 1,905,588	$ 1,781,809

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

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- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
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- Definition

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 35K
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
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-Subparagraph a
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- Definition

The percentage rate of trade and other current receivables as at reporting period.

+ References

No definition available.

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- Details

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