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v3.20.1

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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