Fair value measurements (Details)	6 Months Ended
Jun. 30, 2020 USD ($) EquityInstruments	Dec. 31, 2019 USD ($)
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
Assets	$ 5,182,200,000	$ 5,280,600,000
Number of investments with no quoted market price in an active market \| EquityInstruments	1
Recurring Basis
Fair value measurements
Financial assets, at fair value	$ 160,000,000	165,000,000
Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	137,300,000	141,700,000
Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	18,900,000	19,400,000
Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	3,800,000	3,900,000
Receivables from provisional concentrate sales \| Recurring Basis
Fair value measurements
Financial assets, at fair value	16,000,000	16,400,000
Receivables from provisional concentrate sales \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	16,000,000	16,400,000
Equity investments \| Recurring Basis
Fair value measurements
Financial assets, at fair value	141,100,000	145,600,000
Equity investments \| Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	137,300,000	141,700,000
Equity investments \| Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	3,800,000	3,900,000
Warrants \| Recurring Basis
Fair value measurements
Financial assets, at fair value	2,900,000	3,000,000
Warrants \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	$ 2,900,000	$ 3,000,000

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

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- Definition

Expiry date 2020-01-01: The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity. Effective 2020-01-01: The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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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.

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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
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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
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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

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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

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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

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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

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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]]

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

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

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