Fair value measurements (Details)	12 Months Ended
Dec. 31, 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	$ 5,592,900,000	$ 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	$ 211,400,000	165,000,000
Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	191,800,000	141,700,000
Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	15,800,000	19,400,000
Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	3,800,000	3,900,000
Non recurring Basis
Fair value measurements
Financial assets, at fair value	591,500,000
Non recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	591,500,000
Receivables from provisional concentrate sales \| Recurring Basis
Fair value measurements
Financial assets, at fair value	10,100,000	16,400,000
Receivables from provisional concentrate sales \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	10,100,000	16,400,000
Equity investments \| Recurring Basis
Fair value measurements
Financial assets, at fair value	195,600,000	145,600,000
Equity investments \| Recurring Basis \| Level 1
Fair value measurements
Financial assets, at fair value	191,800,000	141,700,000
Equity investments \| Recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	3,800,000	3,900,000
SCOOP/STACK \| Non recurring Basis
Fair value measurements
Financial assets, at fair value	309,200,000
SCOOP/STACK \| Non recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	309,200,000
Weyburn \| Non recurring Basis
Fair value measurements
Financial assets, at fair value	162,800,000
Weyburn \| Non recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	162,800,000
Mine Waste Solutions \| Non recurring Basis
Fair value measurements
Financial assets, at fair value	114,800,000
Mine Waste Solutions \| Non recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	114,800,000
Warrants \| Recurring Basis
Fair value measurements
Financial assets, at fair value	5,700,000	3,000,000
Warrants \| Recurring Basis \| Level 2
Fair value measurements
Financial assets, at fair value	5,700,000	$ 3,000,000
Oil well equipment \| Non recurring Basis
Fair value measurements
Financial assets, at fair value	4,700,000
Oil well equipment \| Non recurring Basis \| Level 3
Fair value measurements
Financial assets, at fair value	$ 4,700,000

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

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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.

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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.

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

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

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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]]

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