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v3.20.4

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 |

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