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Commitments and Contingencies - Narrative (Details) $ in Millions | Dec. 31, 2019 USD ($) oz $ / oz | Dec. 31, 2018 USD ($)
--- | --- | ---
Guarantor Obligations [Line Items] |  |
Maximum loss exposure under outstanding letters of credit | $ | $ 1.4 | $ 6.2
Forward Contracts | Gold, Ounces |  |
Guarantor Obligations [Line Items] |  |
Investment contract weight | oz | 30,500 |
Derivative, average forward price | $ / oz | 1,440 |
Minimum |  |
Guarantor Obligations [Line Items] |  |
Operating leases term | 3 years |
Maximum |  |
Guarantor Obligations [Line Items] |  |
Operating leases term | 5 years |

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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