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Fair Value Measurements, Fair Value Hierarchy Table (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Financial Assets: |  |
Derivative Assets | $ 101.8 | $ 81.8
Deferred compensation plan assets | 7.2 | 6.5
Financial Liabilities: |  |
Derivative Liabilities | (102.5) | (86.1)
Recurring |  |
Financial Assets: |  |
Cash and cash equivalents | 212.3 | 169.5
Deferred compensation plan assets | 7.2 | 6.5
Total Assets | 421.4 | 387.3
Financial Liabilities: |  |
Convertible Notes | (280.8) | (260.0)
Total Liabilities | (631.1) | (601.5)
Recurring | Senior Notes |  |
Financial Liabilities: |  |
Senior Notes | (247.8) | (255.4)
Recurring | Debt securities |  |
Financial Assets: |  |
Short-term investments | 100.1 | 129.5
Recurring | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.5 | 0.1
Financial Liabilities: |  |
Derivative Liabilities | (1.3) | (1.8)
Recurring | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 1.5 | 1.1
Recurring | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.2 | 0.5
Financial Liabilities: |  |
Derivative Liabilities | (1.4) | (0.8)
Recurring | Electricity | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.3 | 0.5
Financial Liabilities: |  |
Derivative Liabilities | (0.5) | (0.4)
Recurring | Foreign Currency | Fixed priced contracts | Purchase | Euro |  |
Financial Assets: |  |
Derivative Assets |  | 0.1
Recurring | Hedges Relating to the Convertible Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 99.3 | 79.5
Recurring | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | (99.3) | (83.1)
Recurring | Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents | 35.4 | 57.7
Deferred compensation plan assets | 0 | 0
Total Assets | 35.4 | 57.7
Financial Liabilities: |  |
Convertible Notes | (280.8) | (260.0)
Total Liabilities | (528.6) | (515.4)
Recurring | Level 1 | Senior Notes |  |
Financial Liabilities: |  |
Senior Notes | (247.8) | (255.4)
Recurring | Level 1 | Debt securities |  |
Financial Assets: |  |
Short-term investments | 0 | 0
Recurring | Level 1 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Recurring | Level 1 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Recurring | Level 1 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Recurring | Level 1 | Electricity | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Recurring | Level 1 | Foreign Currency | Fixed priced contracts | Purchase | Euro |  |
Financial Assets: |  |
Derivative Assets |  | 0
Recurring | Level 1 | Hedges Relating to the Convertible Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Recurring | Level 1 | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Recurring | Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents | 176.9 | 111.8
Deferred compensation plan assets |  | 6.5
Total Assets | 384.5 | 328.5
Financial Liabilities: |  |
Convertible Notes | 0 | 0
Total Liabilities | (102.5) | (86.1)
Recurring | Level 2 | Senior Notes |  |
Financial Liabilities: |  |
Senior Notes | 0 | 0
Recurring | Level 2 | Debt securities |  |
Financial Assets: |  |
Short-term investments |  | 129.5
Recurring | Level 2 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.5 | 0.1
Financial Liabilities: |  |
Derivative Liabilities | (1.3) | (1.8)
Recurring | Level 2 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Recurring | Level 2 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.2 | 0.5
Financial Liabilities: |  |
Derivative Liabilities | (1.4) | (0.8)
Recurring | Level 2 | Electricity | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.3 | 0.5
Financial Liabilities: |  |
Derivative Liabilities | (0.5) | (0.4)
Recurring | Level 2 | Foreign Currency | Fixed priced contracts | Purchase | Euro |  |
Financial Assets: |  |
Derivative Assets |  | 0.1
Recurring | Level 2 | Hedges Relating to the Convertible Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 99.3 | 79.5
Recurring | Level 2 | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | (99.3) | (83.1)
Recurring | Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
Deferred compensation plan assets | 0 | 0
Total Assets | 1.5 | 1.1
Financial Liabilities: |  |
Convertible Notes | 0 | 0
Total Liabilities | 0 | 0
Recurring | Level 3 | Senior Notes |  |
Financial Liabilities: |  |
Senior Notes | 0 | 0
Recurring | Level 3 | Debt securities |  |
Financial Assets: |  |
Short-term investments | 0 | 0
Recurring | Level 3 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Recurring | Level 3 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 1.5 | 1.1
Recurring | Level 3 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Recurring | Level 3 | Electricity | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
Recurring | Level 3 | Foreign Currency | Fixed priced contracts | Purchase | Euro |  |
Financial Assets: |  |
Derivative Assets |  | 0
Recurring | Level 3 | Hedges Relating to the Convertible Notes | Call Options |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Recurring | Level 3 | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | $ 0 | $ 0

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