Business Combination, Contingent Consideration, Permitting Payment, Estimated Discount Rate

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- Definition

Business Combination, Contingent Consideration, Resource Declaration Payment, Estimated Discount Rate

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Long-Term Purchase Commitment, Number Of Milestones

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- Definition

Amount of asset recognized arising from contingent consideration in a business combination.

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Amount, after accumulated amortization, of debt discount (premium).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair Value Measurements - Narrative (Details) $ in Millions	1 Months Ended	9 Months Ended
Fair Value Measurements - Narrative (Details) $ in Millions	Oct. 31, 2017 USD ($)	Sep. 30, 2020 USD ($) milestone	Dec. 31, 2019 USD ($)
Senior Notes due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net unamortized debt issuance costs		$ 2.6	$ 3.1
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%