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Fair Value Measurements, Fair Value Hierarchy Table (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Financial Assets: |  |
Derivative Assets | $ 90.6 | $ 81.8
Deferred compensation plan assets | 7.4 | 6.5
Financial Liabilities: |  |
Derivative Liabilities | (90.0) | (86.1)
Recurring |  |
Financial Assets: |  |
Cash and cash equivalents | 174.2 | 169.5
Deferred compensation plan assets | 7.4 | 6.5
Total Assets | 399.4 | 387.3
Financial Liabilities: |  |
Convertible Notes | (269.7) | (260.0)
Total Liabilities | (612.9) | (601.5)
Recurring | Senior Notes |  |
Financial Liabilities: |  |
Senior Notes | (253.2) | (255.4)
Recurring | Debt securities |  |
Financial Assets: |  |
Short-term investments | 127.2 | 129.5
Recurring | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 1.4 | 1.1
Recurring | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.8 | 0.1
Financial Liabilities: |  |
Derivative Liabilities | (0.5) | (1.8)
Recurring | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.9 | 0.5
Financial Liabilities: |  |
Derivative Liabilities | (0.6) | (0.8)
Recurring | Electricity | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 1.0 | 0.5
Financial Liabilities: |  |
Derivative Liabilities | (0.2) | (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 | 86.5 | 79.5
Recurring | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | (88.7) | (83.1)
Recurring | Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents | 69.7 | 57.7
Deferred compensation plan assets | 0 | 0
Total Assets | 69.7 | 57.7
Financial Liabilities: |  |
Convertible Notes | (269.7) | (260.0)
Total Liabilities | (522.9) | (515.4)
Recurring | Level 1 | Senior Notes |  |
Financial Liabilities: |  |
Senior Notes | (253.2) | (255.4)
Recurring | Level 1 | Debt securities |  |
Financial Assets: |  |
Short-term investments | 0 | 0
Recurring | Level 1 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 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 | 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 | 104.5 | 111.8
Deferred compensation plan assets | 7.4 | 6.5
Total Assets | 328.3 | 328.5
Financial Liabilities: |  |
Convertible Notes | 0 | 0
Total Liabilities | (90.0) | (86.1)
Recurring | Level 2 | Senior Notes |  |
Financial Liabilities: |  |
Senior Notes | 0 | 0
Recurring | Level 2 | Debt securities |  |
Financial Assets: |  |
Short-term investments | 127.2 | 129.5
Recurring | Level 2 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Recurring | Level 2 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.8 | 0.1
Financial Liabilities: |  |
Derivative Liabilities | (0.5) | (1.8)
Recurring | Level 2 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0.9 | 0.5
Financial Liabilities: |  |
Derivative Liabilities | (0.6) | (0.8)
Recurring | Level 2 | Electricity | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 1.0 | 0.5
Financial Liabilities: |  |
Derivative Liabilities | (0.2) | (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 | 86.5 | 79.5
Recurring | Level 2 | Hedges Relating to the Convertible Notes | Bifurcated Conversion Feature |  |
Financial Liabilities: |  |
Derivative Liabilities | (88.7) | (83.1)
Recurring | Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
Deferred compensation plan assets | 0 | 0
Total Assets | 1.4 | 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 | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Assets | 1.4 | 1.1
Recurring | Level 3 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Assets | 0 | 0
Financial Liabilities: |  |
Derivative Liabilities | 0 | 0
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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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