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Derivative Financial Instruments and Related Hedging Programs, Notional Quantity Table (Details) | Mar. 31, 2012 mmlbs
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Aluminum | Fixed priced purchase contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 96.1 |
Aluminum | Fixed priced sales contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 2.0 |
Aluminum | Midwest premium swap contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 77.2 | [1]
Natural Gas | Call option purchase contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 3,270,000 | [2]
Natural Gas | Put option sales contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 3,270,000 | [2]
Natural Gas | Fixed priced purchase contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 2,520,000 | [2]
Electricity | Fixed priced purchase contracts |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 296,425 |
Hedges Relating to Notes | Bifurcated Conversion Feature |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 3,623,113 | [3]
Hedges Relating to Notes | Call Options |  |
Summary of material derivative positions |  |
Notional Amount of Contracts | 3,623,113 | [3]
Remainder of 2012 |  |
Summary of material derivative positions |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices have been reduced | 85.00% |
2013 |  |
Summary of material derivative positions |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices have been reduced | 58.00% |
2014 |  |
Summary of material derivative positions |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices have been reduced | 25.00% |
[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, 2012, the Company’s exposure to fluctuations in natural gas prices had been substantially reduced for approximately 85%, 58% and 25% of the expected natural gas purchases for the remainder of 2012, 2013 and 2014, respectively.
[3] | The Bifurcated Conversion Feature represents the cash conversion feature of the Notes. To hedge against the potential cash outflows associated with the Bifurcated Conversion Feature, the Company purchased cash-settled Call Options. The Call Options have an exercise price equal to the conversion price of the Notes, subject to anti-dilution adjustments substantially similar to the anti-dilution adjustments for the Notes. The Call Options will expire upon the maturity of the 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 + 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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