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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Expected Useful Lives | The expected useful lives are as follows:
•  Buildings and equipment (not used for production) |  | 2–50 years
•  Plant and equipment (smelting operations) |  | 3–30 years

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- Definition The tabular disclosure of property plant and equipment estimated useful life. + References No definition available. + Details
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Period Type: | duration

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- Definition Text block [abstract] + References No definition available. + Details
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