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Fair value measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Recurring Basis |
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 June 30, 2018 |  | (Level 1) |  | (Level 2) |  | (Level 3) |  |  | Fair Value |
Receivables from provisional gold equivalent sales |  | $ | — |  | $ | 7.1 |  | $ | — |  |  | $ | 7.1 |
Equity investments |  |  | 142.9 |  |  | — |  |  | 4.0 |  |  |  | 146.9 |
Warrants |  |  | — |  |  | 0.8 |  |  | — |  |  |  | 0.8 |
|  | $ | 142.9 |  | $ | 7.9 |  | $ | 4.0 |  |  | $ | 154.8 |
|  | Quoted Prices in |  | Significant Other |  | Significant |  |  |  |
|  | Active Markets for |  | Observable |  | Unobservable |  |  |  |
|  | Identical Assets |  | Inputs |  | Inputs |  |  | Aggregate |
As at December 31, 2017 |  | (Level 1) |  | (Level 2) |  | (Level 3) |  |  | Fair Value |
Cash and cash equivalents |  | $ | 511.1 |  | $ | — |  | $ | — |  |  | $ | 511.1 |
Receivables from provisional gold equivalent sales |  |  | — |  |  | 11.3 |  |  | — |  |  |  | 11.3 |
Available-for-sale equity investments |  |  | 168.1 |  |  | — |  |  | — |  |  |  | 168.1 |
Warrants |  |  | — |  |  | 0.8 |  |  | — |  |  |  | 0.8 |
|  | $ | 679.2 |  | $ | 12.1 |  | $ | — |  |  | $ | 691.3 |

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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 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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