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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- Definition

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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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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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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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability exceeding amount recognized at acquisition date. Includes, but is not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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Fair Value Measurements - Narrative (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
Fair Value Measurements - Narrative (Details) $ in Millions	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