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Fair Value Measurements, Fair Value Hierarchy Table (Details) (Recurring, USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Financial Assets: |  |
Cash and cash equivalents | $ 248.0 | $ 273.4
Available for sale securities | 5.8 | 5.6
Total Assets | 402.8 | 422.5
Financial Liabilities: |  |
Convertible Notes | (244.3) | (240.1)
Total Liabilities | (569.4) | (556.8)
Aluminum | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets |  | 2.6
Financial Liabilities: |  |
Derivative Liabilities | (2.4) | (0.5)
Aluminum | Fixed priced sales contracts |  |
Financial Assets: |  |
Derivative Assets | 0.1 |
Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 0.4 | 0.4
Natural Gas | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 1.0 | 0.2
Financial Liabilities: |  |
Derivative Liabilities | (1.1) | (2.6)
Natural Gas | Put option sales contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (0.1) | (0.5)
Electricity | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 0.6 |
Financial Liabilities: |  |
Derivative Liabilities | (0.5) | (1.0)
Hedges Relating to the Convertible Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 61.3 | 55.3
Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | (67.7) | (62.1)
Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents | 82.9 | 107.9
Available for sale securities | 0 | 0
Total Assets | 82.9 | 107.9
Financial Liabilities: |  |
Convertible Notes | (244.3) | (240.1)
Total Liabilities | (497.4) | (490.1)
Level 1 | Aluminum | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets |  | 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
Level 1 | Natural Gas | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
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 Assets: |  |
Derivative Assets | 0 |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 1 | Hedges Relating to the Convertible Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Level 1 | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents | 165.1 | 165.5
Available for sale securities | 5.8 | 5.6
Total Assets | 319.5 | 314.2
Financial Liabilities: |  |
Convertible Notes | 0 | 0
Total Liabilities | (72.0) | (66.7)
Level 2 | Aluminum | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets |  | 2.6
Financial Liabilities: |  |
Derivative Liabilities | (2.4) | (0.5)
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
Level 2 | Natural Gas | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 1.0 | 0.2
Financial Liabilities: |  |
Derivative Liabilities | (1.1) | (2.6)
Level 2 | Natural Gas | Put option sales contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (0.1) | (0.5)
Level 2 | Electricity | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 0.6 |
Financial Liabilities: |  |
Derivative Liabilities | (0.5) | (1.0)
Level 2 | Hedges Relating to the Convertible Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 61.3 | 55.3
Level 2 | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | (67.7) | (62.1)
Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
Available for sale securities | 0 | 0
Total Assets | 0.4 | 0.4
Financial Liabilities: |  |
Convertible Notes | 0 | 0
Total Liabilities | 0 | 0
Level 3 | Aluminum | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets |  | 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 | 0.4 | 0.4
Level 3 | Natural Gas | Fixed priced purchase contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
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 Assets: |  |
Derivative Assets | 0 |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Level 3 | Hedges Relating to the Convertible Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Level 3 | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Senior Notes |  |
Financial Liabilities: |  |
Senior Notes | (253.1) | (250.0)
Senior Notes | Level 1 |  |
Financial Liabilities: |  |
Senior Notes | (253.1) | (250.0)
Senior Notes | Level 2 |  |
Financial Liabilities: |  |
Senior Notes | 0 | 0
Senior Notes | Level 3 |  |
Financial Liabilities: |  |
Senior Notes | 0 | 0
Short-term investments |  |
Financial Assets: |  |
Short-term investments | 85.6 | 85.0
Short-term investments | Level 1 |  |
Financial Assets: |  |
Short-term investments | 0 | 0
Short-term investments | Level 2 |  |
Financial Assets: |  |
Short-term investments | 85.6 | 85.0
Short-term investments | Level 3 |  |
Financial Assets: |  |
Short-term investments | 0 | 0
Euro | Foreign Currency | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (0.2) |
Euro | Level 1 | Foreign Currency | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 |
Euro | Level 2 | Foreign Currency | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | (0.2) |
Euro | Level 3 | Foreign Currency | Fixed priced purchase contracts |  |
Financial Liabilities: |  |
Derivative Liabilities | $ 0 |

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