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Fair value measurements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of fair value measurement of assets [line items] |  |
Transfer from Level 1 to 2 of financial assets | $ 0.0 |
Transfer from Level 2 to 1 of financial assets | 0.0 |
Transfer from Level 1 to 2 of financial liabilities | 0.0 |
Transfer from Level 2 to 1 of financial liabilities | 0.0 |
Transfers Into Level 3 of financial assets | 0.0 |
Transfers Out of Level 3 of financial assets | 0.0 |
Transfers Into Level 3 of financial liabilities | 0.0 |
Transfers Out of Level 3 of financial liabilities | 0.0 |
Total assets | 4,788.4 | $ 4,221.6
Recurring Basis |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 691.3 | 378.3
Recurring Basis | Level 1 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 679.2 | 367.6
Recurring Basis | Level 2 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 12.1 | 10.7
Non recurring Basis |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 2.1 | 2.1
Non recurring Basis | Level 3 |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 2.1 | 2.1
Cash and cash equivalents | Recurring Basis |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 511.1 | 253.0
Cash and cash equivalents | Recurring Basis | Level 1 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 511.1 | 253.0
Receivables from provisional gold equivalent sales | Recurring Basis |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 11.3 | 9.8
Receivables from provisional gold equivalent sales | Recurring Basis | Level 2 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 11.3 | 9.8
Available-for-sale equity investments | Recurring Basis |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 168.1 | 114.6
Available-for-sale equity investments | Recurring Basis | Level 1 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 168.1 | 114.6
Warrants | Recurring Basis |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 0.8 | 0.9
Warrants | Recurring Basis | Level 2 |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 0.8 | 0.9
Royalty stream and working interests | Non recurring Basis |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | 2.1 | 2.1
Royalty stream and working interests | Non recurring Basis | Level 3 |  |
Disclosure of fair value measurement of assets [line items] |  |
Total assets | $ 2.1 | $ 2.1

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- Definition The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_c&doctype=Standard -URIDate 2017-03-09 + Details
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