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Derivative Financial Instruments - Summary of Derivative Cash Flow Hedges (Details) - Designated as Hedging Instrument | 9 Months Ended
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Sep. 30, 2019 oz $ / oz
Gold Put Options - 2019 |
Derivative [Line Items] |
Average gold strike price per ounce | $ / oz | 1,405
Notional ounces | oz | 63,000
Gold Put Options - 2020 |
Derivative [Line Items] |
Average gold strike price per ounce | $ / oz | 1,408
Notional ounces | oz | 96,000
Gold Call Options - 2019 |
Derivative [Line Items] |
Average gold strike price per ounce | $ / oz | 1,798
Notional ounces | oz | 63,000
Gold Call Options - 2020 |
Derivative [Line Items] |
Average gold strike price per ounce | $ / oz | 1,803
Notional ounces | oz | 96,000

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- Definition 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. + References No definition available. + Details
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- Definition Fixed price related to the price risk swap derivative. + References No definition available. + Details
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