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Acquisition of Sebree aluminum smelter (Policies)	9 Months Ended
Acquisition of Sebree aluminum smelter (Policies)	Sep. 30, 2014
Business Combinations [Abstract]
Purchase Price Allocation	Purchase Price Allocation Allocating the purchase price to the acquired assets and liabilities involves management judgment. We allocated the purchase price in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 805 "Business Combinations" using the estimated fair values at the date of acquisition.

Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.

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