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v3.19.1

Fair value measurements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair value measurements |  |
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 |
Assets | 4,931.8 | $ 4,788.4
Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 145.9 | 691.3
Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value | 132.8 | 679.2
Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | 9.2 | 12.1
Recurring Basis | Level 3 |  |
Fair value measurements |  |
Financial assets, at fair value | 3.9 |
Non recurring Basis |  |
Fair value measurements |  |
Assets | 14.6 |
Non recurring Basis | Level 3 |  |
Fair value measurements |  |
Assets | 14.6 |
Cash and cash equivalents | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value |  | 511.1
Cash and cash equivalents | Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value |  | 511.1
Receivables from provisional concentrate sales | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 8.5 | 11.3
Receivables from provisional concentrate sales | Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | 8.5 | 11.3
Equity investments | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 136.7 |
Equity investments | Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value | 132.8 |
Equity investments | Recurring Basis | Level 3 |  |
Fair value measurements |  |
Financial assets, at fair value | 3.9 |
Available-for-sale | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value |  | 168.1
Available-for-sale | Recurring Basis | Level 1 |  |
Fair value measurements |  |
Financial assets, at fair value |  | 168.1
Warrants | Recurring Basis |  |
Fair value measurements |  |
Financial assets, at fair value | 0.7 | 0.8
Warrants | Recurring Basis | Level 2 |  |
Fair value measurements |  |
Financial assets, at fair value | 0.7 | $ 0.8
Royalty stream and working interests | Non recurring Basis |  |
Fair value measurements |  |
Assets | 14.6 |
Royalty stream and working interests | Non recurring Basis | Level 3 |  |
Fair value measurements |  |
Assets | $ 14.6 |

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