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Subsequent events	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent events	Subsequent events On October 22, 2015, we issued a notice to employees at our Mt. Holly, South Carolina aluminum smelter of our intent to curtail the Mt. Holly plant operations by no later than December 31, 2015, when our current power contract at Mt. Holly expires, if we are unable to secure a competitively priced power arrangement to deliver energy to the plant. The announcement was made pursuant to the federal Working Adjustment and Retraining Notification Act (WARN). On October 30, 2015, we issued a notice to employees at our Sebree, Kentucky aluminum smelter of our intent to curtail one of its three potlines by December 31, 2015. The announcement was made pursuant to WARN.

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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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