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Subsequent events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent events	Subsequent events Additional payment made for Mt. Holly aluminum smelter In April 2015, we paid an additional payment of $38,162 for the acquisition of the Mt. Holly aluminum smelter for pension funding obligations, final working capital and economic adjustments, net of certain amounts owed by Alumax to Mt. Holly.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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