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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Expected Useful Lives | The expected useful lives are as follows:
| • |  | Buildings and equipment (not used in 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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- Definition Text block1 [abstract] + References No definition available. + Details
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