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Fair Value of financial instruments (Narrative) (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CAD ($) $ / ounce
Disclosure of fair value measurement of assets [line items]
Foreign exchange contracts aggregate amount		$ 12.0
Level 3 [Member]
Disclosure of fair value measurement of assets [line items]
Sensitivity analysis, variance, percentage			10.00%
Effect of variance on fair value	$ 0.3		$ 0.4
Increase (decrease) in the fair value of investments			$ 6.7
Level 3 [Member] | Discounted cash flow [member]
Disclosure of fair value measurement of assets [line items]
Percentage of increase (decrease) on gold price	10.00%	10.00%
Basis points increase (decrease) on discount rate			100
Base price used in the discounted cash flow model | $ / ounce			1,300
Discount rate			5.10%

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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.

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The increase (decrease) in the fair value measurement of the entity's own equity instruments. [Refer: At fair value [member]; Entity's own equity instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2018-01-01
-Paragraph 93
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e&doctype=Standard
-URIDate 2018-03-16

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