Fair value measurements (Details)	6 Months Ended
Jun. 30, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Fair value measurements
Transfer from Level 1 to 2 of financial assets	$ 0
Transfer from Level 2 to 1 of financial assets	0
Transfer from Level 1 to 2 of financial liabilities	0
Transfer from Level 2 to 1 of financial liabilities	0
Transfers Into Level 3 of financial assets	0
Transfers Out of Level 3 of financial assets	0
Transfers Into Level 3 of financial liabilities	0
Transfers Out of Level 3 of financial liabilities	0
Recurring Basis
Fair value measurements
Financial assets, at fair value	154,800,000	$ 691,300,000
Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	142,900,000	679,200,000
Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	7,900,000	12,100,000
Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	4,000,000
Cash and cash equivalents \| Recurring Basis
Fair value measurements
Financial assets, at fair value		511,100,000
Cash and cash equivalents \| Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value		511,100,000
Receivables from provisional gold equivalents sales \| Recurring Basis
Fair value measurements
Financial assets, at fair value	7,100,000	11,300,000
Receivables from provisional gold equivalents sales \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	$ 7,100,000	11,300,000
Equity investments
Fair value measurements
Number of investments with no quoted market price in an active market \| item	1
Equity investments \| Recurring Basis
Fair value measurements
Financial assets, at fair value	$ 146,900,000
Equity investments \| Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	142,900,000
Equity investments \| Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	4,000,000
Available-for-sale \| Recurring Basis
Fair value measurements
Financial assets, at fair value		168,100,000
Available-for-sale \| Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value		168,100,000
Warrants \| Recurring Basis
Fair value measurements
Financial assets, at fair value	800,000	800,000
Warrants \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	$ 800,000	$ 800,000

The number of investments with no quoted market price in an active market.

No definition available.

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard
-URIDate 2017-03-09

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- Definition

The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 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 e
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_iv&doctype=Standard
-URIDate 2017-03-09

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- Definition

The amount of transfers of liabilities into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

+ Details

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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

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- Definition

The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of liabilities held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

+ Details

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- Definition

The amount of transfers out of Level 2 and into Level 1 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

+ Details

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- Definition

The amount of transfers out of Level 2 and into Level 1 of the fair value hierarchy of liabilities held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

+ Details

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- Definition

The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

+ Details

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- Definition

The amount of transfers of liabilities out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

+ Details

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