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Derivative Financial Instruments and Related Hedging Programs, Notional Quantity Table (Details) | Mar. 31, 2013 Remainder of 2013 | Mar. 31, 2013 2014 | Mar. 31, 2013 2015 | Mar. 31, 2013 Not Designated as Hedging Instrument Aluminum Fixed priced purchase contracts mmlbs | Mar. 31, 2013 Not Designated as Hedging Instrument Aluminum Fixed priced sales contracts mmlbs | Mar. 31, 2013 Not Designated as Hedging Instrument Aluminum Midwest premium swap contracts mmlbs | Mar. 31, 2013 Not Designated as Hedging Instrument Natural Gas Call option purchase contracts MMBTU | Mar. 31, 2013 Not Designated as Hedging Instrument Natural Gas Put option sales contracts MMBTU | Mar. 31, 2013 Not Designated as Hedging Instrument Natural Gas Fixed priced purchase contracts MMBTU | Mar. 31, 2013 Not Designated as Hedging Instrument Electricity Fixed priced purchase contracts MWH | Mar. 31, 2013 Not Designated as Hedging Instrument Foreign Currency Euro Fixed priced purchase contracts EUR (€) | Mar. 31, 2013 Not Designated as Hedging Instrument Foreign Currency GBP Fixed priced purchase contracts GBP (£) | Mar. 31, 2013 Not Designated as Hedging Instrument Hedges Relating to the Convertible Notes Bifurcated Conversion Feature | Mar. 31, 2013 Not Designated as Hedging Instrument Hedges Relating to the Convertible Notes Call Options
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Summary of material derivative positions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of contracts |  |  |  | 53.6 | 1.2 | 51.3 | [1] | 690,000 | [2] | 690,000 | [2] | 7,160,000 | [2] | 384,025 |  |  | 3,627,908 | [3] | 3,627,908 | [3]
Notional Amount of contracts, currency |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 3,902,297 | £ 264,633 |  |  |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced | 88.00% | 83.00% | 48.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Regional premiums represent the premium over the London Metal Exchange price for primary aluminum which is incurred on the Company’s purchases of primary aluminum.
[2] | As of March 31, 2013, the Company’s exposure to fluctuations in natural gas prices had been substantially reduced for approximately 88%, 83% and 48% of the expected natural gas purchases for the remainder of 2013, 2014 and 2015, respectively.
[3] | The Bifurcated Conversion Feature represents the cash conversion feature of the Convertible Notes. The Call Options expire on the maturity of the Convertible Notes and have an exercise price equal to the conversion price of the Convertible Notes, subject to anti-dilution adjustments substantially similar to the anti-dilution adjustments for the Convertible Notes. Although the fair value of the Call Options is derived from a notional number of shares of the Company’s common stock, the Call Options may only be settled in cash.

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Percentage Of Natural Gas Purchases For Which The Companys Exposure To Fluctuations In Gas Prices Have Been Reduced. + References No definition available. + Details
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