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Provisions and other liabilities (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 CAD ($)
Disclosure of other provisions [line items]
Provision for environmental rehabilitation	$ 23.4
Weighted average actualization rate	4.20%

X

- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2018-01-01
-Section D Examples: disclosures
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-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
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-IssueDate 2018-01-01
-Paragraph 87
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-URIDate 2018-03-16

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X

- Definition

Weighted average actualization rate.

+ References

No definition available.

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