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Fair Value Measurements, Fair Value Hierarchy Table (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Financial Assets: |  |
Cash and cash equivalents | $ 77.3 | $ 49.8
Available for sale securities | 5.1 | 4.9
Total Assets | 121.7 | 101.4
Financial Liabilities: |  |
Notes | (210.4) | (203.0)
Total Liabilities | (274.8) | (278.2)
Aluminum | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 0.8 | 0.3
Financial Liabilities: |  |
Derivative Liabilities | (4.1) | (7.8)
Aluminum | Fixed priced sales contracts |  |
Financial Assets: |  |
Derivative Assets | 0.1 |
Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 0.9 | 0.1
Financial Liabilities: |  |
Derivative Liabilities |  | (0.1)
Natural Gas | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (2.0) | (1.3)
Natural Gas | Put option sales contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (6.2) | (5.6)
Electricity | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (2.8) | (1.8)
Hedges Relating to Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 37.5 | 46.3
Hedges Relating to Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | (44.6) | (53.9)
Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents | 77.3 | 49.8
Available for sale securities | 0 | 0
Total Assets | 77.3 | 49.8
Financial Liabilities: |  |
Notes | (210.4) | (203.0)
Total Liabilities | (210.4) | (203.0)
Level 1 | Aluminum | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 1 | Aluminum | Fixed priced sales contracts |  |
Financial Assets: |  |
Derivative Assets | 0 |
Level 1 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities |  | 0
Level 1 | Natural Gas | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 1 | Natural Gas | Put option sales contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 1 | Electricity | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 1 | Hedges Relating to Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Level 1 | Hedges Relating to Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
Available for sale securities | 5.1 | 4.9
Total Assets | 43.5 | 51.5
Financial Liabilities: |  |
Notes | 0 | 0
Total Liabilities | (64.4) | (75.1)
Level 2 | Aluminum | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 0.8 | 0.3
Financial Liabilities: |  |
Derivative Liabilities | (4.1) | (7.8)
Level 2 | Aluminum | Fixed priced sales contracts |  |
Financial Assets: |  |
Derivative Assets | 0.1 |
Level 2 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities |  | 0
Level 2 | Natural Gas | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (2.0) | (1.3)
Level 2 | Natural Gas | Put option sales contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (6.2) | (5.6)
Level 2 | Electricity | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (2.8) | (1.8)
Level 2 | Hedges Relating to Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 37.5 | 46.3
Level 2 | Hedges Relating to Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | (44.6) | (53.9)
Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
Available for sale securities | 0 | 0
Total Assets | 0.9 | 0.1
Financial Liabilities: |  |
Notes | 0 | 0
Total Liabilities | 0 | (0.1)
Level 3 | Aluminum | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 3 | Aluminum | Fixed priced sales contracts |  |
Financial Assets: |  |
Derivative Assets | 0 |
Level 3 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 0.9 | 0.1
Financial Liabilities: |  |
Derivative Liabilities |  | (0.1)
Level 3 | Natural Gas | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 3 | Natural Gas | Put option sales contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 3 | Electricity | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 3 | Hedges Relating to Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Level 3 | Hedges Relating to Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Nichols Promissory Note |  |
Financial Liabilities: |  |
Promissory Note | (4.7) | (4.7)
Nichols Promissory Note | Level 1 |  |
Financial Liabilities: |  |
Promissory Note | 0 | 0
Nichols Promissory Note | Level 2 |  |
Financial Liabilities: |  |
Promissory Note | (4.7) | (4.7)
Nichols Promissory Note | Level 3 |  |
Financial Liabilities: |  |
Promissory Note | $ 0 | $ 0

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