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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 31, 2017 | May 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Ownership in Metalla Royalty & Streaming Ltd. |  |  |  | 19.90% |  |
Senior Notes due 2024 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Net unamortized debt issuance costs |  | $ 4.7 | $ 4.9 |  |  |
Stated interest rate |  |  |  |  |  | 5.875%
Senior Notes due 2024 | Senior Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Stated interest rate |  |  | 5.875% |  |  |
Non-core three royalties and stream |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total consideration |  |  |  |  | $ 13.0 |
Convertible debenture |  |  |  |  | $ 6.7 |
Debt Securities | Metalla Royalty & Streaming Ltd. |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Stated interest rate |  |  | 5.00% |  |  |
JDS Silver Holdings Ltd. |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long-term Purchase Commitment, Milestones |  | 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% |  |  |  |  |

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