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Subsequent events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]
Subsequent events	Subsequent Events We have evaluated all subsequent events through the date the financial statements were issued. Century Sebree enters an agreement for market-based power In January 2013, Sebree issued a 12-month notice to terminate its long-term power supply agreement. On January 31, 2014, pursuant to the termination notice, the Sebree Power Agreement terminated. On February 1, 2014, Sebree began taking power under a new market-based power contract, similar to the agreement we have reached for Hawesville, providing market-based power to the Sebree smelter. Under the arrangement, Kenergy and Big Rivers purchase power on the open market and pass it through to Sebree at MISO pricing plus transmission and other costs incurred by them.

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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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