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Fair Value Measurements - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) milestone | Dec. 31, 2019 USD ($) | May 31, 2017
Senior Notes due 2024 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Net unamortized debt issuance costs |  |  | $ 2.4 | $ 3.1 |
Stated interest rate |  |  |  |  | 5.875%
JDS Silver Holdings Ltd. |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Long-term Purchase Commitment, Milestones | milestone |  |  | 2 |  |
Silvertip Mine |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration payment | $ 25.0 |  |  |  |
Permitting payment, estimated discount rate (percentage) | 2.50% |  |  |  |
Resource declaration payment, estimated discount rate (percentage) | 2.90% |  |  |  |
Payment of contingent consideration, permitting milestone reached |  | $ 25.0 |  | $ 25.0 |

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