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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Recurring Basis |
Fair value measurements |
Schedule of Assets and Liabilities Measured at Fair Value |
|  | Quoted prices in |  | Significant other |  | Significant |  |  |  |
|  | active markets for |  | observable |  | unobservable |  |  |  |
|  | identical assets |  | inputs |  | inputs |  |  | Aggregate |
As at December 31, 2020 |  | (Level 1) |  | (Level 2) |  | (Level 3) |  |  | fair value |
Receivables from provisional concentrate sales |  | $ | — |  | $ | 10.1 |  | $ | — |  |  | $ | 10.1 |
Equity investments |  |  | 191.8 |  |  | — |  |  | 3.8 |  |  |  | 195.6 |
Warrants |  |  | — |  |  | 5.7 |  |  | — |  |  |  | 5.7 |
|  | $ | 191.8 |  | $ | 15.8 |  | $ | 3.8 |  |  | $ | 211.4 |
|  | Quoted prices in |  | Significant other |  | Significant |  |  |  |
|  | active markets for |  | observable |  | unobservable |  |  |  |
|  | identical assets |  | inputs |  | inputs |  |  | Aggregate |
As at December 31, 2019 |  | (Level 1) |  | (Level 2) |  | (Level 3) |  |  | fair value |
Receivables from provisional concentrate sales |  | $ | — |  | $ | 16.4 |  | $ | — |  |  | $ | 16.4 |
Equity investments |  |  | 141.7 |  |  | — |  |  | 3.9 |  |  |  | 145.6 |
Warrants |  |  | — |  |  | 3.0 |  |  | — |  |  |  | 3.0 |
|  | $ | 141.7 |  | $ | 19.4 |  | $ | 3.9 |  |  | $ | 165.0 |
Non recurring Basis |
Fair value measurements |
Schedule of Assets Measured at Fair Value on a Non-Recurring Basis |
|  | Quoted prices in |  | Significant other |  | Significant |  |  |  |
|  | active markets for |  | observable |  | unobservable |  |  |  |
|  | identical assets |  | inputs |  | inputs |  |  | Aggregate |
As at December 31, 2020 |  | (Level 1) |  | (Level 2) |  | (Level 3) |  |  | fair value |
SCOOP/STACK |  | $ | — |  | $ | — |  | $ | 309.2 |  |  | $ | 309.2 |
Weyburn |  |  | — |  |  | — |  |  | 162.8 |  |  |  | 162.8 |
Mine Waste Solutions |  |  | — |  |  | — |  |  | 114.8 |  |  |  | 114.8 |
Oil well equipment |  |  | — |  |  | — |  |  | 4.7 |  |  |  | 4.7 |
|  | $ | — |  | $ | — |  | $ | 591.5 |  |  | $ | 591.5 |

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- Definition The disclosure of the fair value of financial instruments. [Refer: Financial instruments, class [member]; At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_10_e&doctype=Standard -URIDate 2020-01-01 + Details
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