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Fair Value Measurements, Fair Value Hierarchy Table (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financial Assets: |  |
Derivative Asset | $ 5.4 | $ 1.6
Deferred compensation plan assets | 7.8 | 7.3
Financial Liabilities: |  |
Derivative Liability | (5.0) | (16.2)
Fair Value, Measurements, Recurring |  |
Financial Assets: |  |
Cash and cash equivalents | 195.3 | 72.5
Deferred compensation plan assets | 7.8 | 7.3
Total Assets | 280.5 | 111.4
Financial Liabilities: |  |
Total Liabilities | (388.4) | (223.5)
Fair Value, Measurements, Recurring | Senior Notes Due 2020 [Member] |  |
Financial Liabilities: |  |
Senior Notes |  | (207.3)
Fair Value, Measurements, Recurring | Senior Notes Due 2024 [Member] |  |
Financial Liabilities: |  |
Senior Notes | (383.4) |
Fair Value, Measurements, Recurring | Debt securities |  |
Financial Assets: |  |
Short-term investments | 72.0 | 30.0
Fair Value, Measurements, Recurring | Aluminum | Option on Securities [Member] | Purchase |  |
Financial Assets: |  |
Derivative Asset |  | 0.2
Fair Value, Measurements, Recurring | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Asset | 4.8 | 0.3
Financial Liabilities: |  |
Derivative Liability |  | (8.9)
Fair Value, Measurements, Recurring | Aluminum | Fixed priced contracts | Sales |  |
Financial Assets: |  |
Derivative Asset |  | 0.2
Financial Liabilities: |  |
Derivative Liability |  | (0.1)
Fair Value, Measurements, Recurring | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Asset |  | 0.9
Fair Value, Measurements, Recurring | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Asset | 0.6 |
Financial Liabilities: |  |
Derivative Liability |  | (6.7)
Fair Value, Measurements, Recurring | Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents | 50.6 | 40.3
Deferred compensation plan assets | 0.0 | 0.0
Total Assets | 50.6 | 40.3
Financial Liabilities: |  |
Total Liabilities | (383.4) | (207.3)
Fair Value, Measurements, Recurring | Level 1 | Senior Notes Due 2020 [Member] |  |
Financial Liabilities: |  |
Senior Notes |  | (207.3)
Fair Value, Measurements, Recurring | Level 1 | Senior Notes Due 2024 [Member] |  |
Financial Liabilities: |  |
Senior Notes | (383.4) |
Fair Value, Measurements, Recurring | Level 1 | Debt securities |  |
Financial Assets: |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Aluminum | Option on Securities [Member] | Purchase |  |
Financial Assets: |  |
Derivative Asset |  | 0.0
Fair Value, Measurements, Recurring | Level 1 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Asset | 0.0 | 0.0
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Fair Value, Measurements, Recurring | Level 1 | Aluminum | Fixed priced contracts | Sales |  |
Financial Assets: |  |
Derivative Asset |  | 0.0
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Fair Value, Measurements, Recurring | Level 1 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Asset |  | 0.0
Fair Value, Measurements, Recurring | Level 1 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Asset | 0.0 |
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Fair Value, Measurements, Recurring | Level 2 |  |
Financial Assets: |  |
Cash and cash equivalents | 144.7 | 32.2
Short-term investments |  | 30.0
Deferred compensation plan assets | 7.8 | 7.3
Total Assets | 229.9 | 70.2
Financial Liabilities: |  |
Total Liabilities | (3.6) | (15.9)
Fair Value, Measurements, Recurring | Level 2 | Senior Notes Due 2020 [Member] |  |
Financial Liabilities: |  |
Senior Notes |  | 0.0
Fair Value, Measurements, Recurring | Level 2 | Senior Notes Due 2024 [Member] |  |
Financial Liabilities: |  |
Senior Notes | 0.0 |
Fair Value, Measurements, Recurring | Level 2 | Debt securities |  |
Financial Assets: |  |
Short-term investments | 72.0 |
Fair Value, Measurements, Recurring | Level 2 | Aluminum | Option on Securities [Member] | Purchase |  |
Financial Assets: |  |
Derivative Asset |  | 0.2
Fair Value, Measurements, Recurring | Level 2 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Asset | 4.8 | 0.3
Financial Liabilities: |  |
Derivative Liability |  | (8.9)
Fair Value, Measurements, Recurring | Level 2 | Aluminum | Fixed priced contracts | Sales |  |
Financial Assets: |  |
Derivative Asset |  | 0.2
Financial Liabilities: |  |
Derivative Liability |  | (0.1)
Fair Value, Measurements, Recurring | Level 2 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Asset |  | 0.0
Fair Value, Measurements, Recurring | Level 2 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Asset | 0.6 |
Financial Liabilities: |  |
Derivative Liability |  | (6.7)
Fair Value, Measurements, Recurring | Level 3 |  |
Financial Assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Total Assets | 0.0 | 0.9
Financial Liabilities: |  |
Total Liabilities | (1.4) | (0.3)
Fair Value, Measurements, Recurring | Level 3 | Senior Notes Due 2020 [Member] |  |
Financial Liabilities: |  |
Senior Notes |  | 0.0
Fair Value, Measurements, Recurring | Level 3 | Senior Notes Due 2024 [Member] |  |
Financial Liabilities: |  |
Senior Notes | 0.0 |
Fair Value, Measurements, Recurring | Level 3 | Debt securities |  |
Financial Assets: |  |
Short-term investments | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Aluminum | Option on Securities [Member] | Purchase |  |
Financial Assets: |  |
Derivative Asset |  | 0.0
Fair Value, Measurements, Recurring | Level 3 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Asset | 0.0 | 0.0
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Fair Value, Measurements, Recurring | Level 3 | Aluminum | Fixed priced contracts | Sales |  |
Financial Assets: |  |
Derivative Asset |  | 0.0
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Fair Value, Measurements, Recurring | Level 3 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Assets: |  |
Derivative Asset | 0.0 |
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Aluminum | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability | (1.2) |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Aluminum | Midwest premium swap contracts |  |
Financial Liabilities: |  |
Derivative Liability | (1.4) |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability | (2.4) |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 1 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability | 0.0 |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 1 | Aluminum | Midwest premium swap contracts |  |
Financial Liabilities: |  |
Derivative Liability | 0.0 |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 1 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability | 0.0 |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability | (1.2) |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Aluminum | Midwest premium swap contracts |  |
Financial Liabilities: |  |
Derivative Liability | 0.0 |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 2 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability | (2.4) |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 3 | Aluminum | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability | 0.0 |
Not Designated as Hedging Instrument | Fair Value, Measurements, Recurring | Level 3 | Natural Gas | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability | 0.0 |
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring | Foreign Currency Member | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability |  | (0.2)
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring | Level 1 | Foreign Currency Member | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring | Level 2 | Foreign Currency Member | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability |  | (0.2)
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring | Level 3 | Foreign Currency Member | Fixed priced contracts | Purchase |  |
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Income Approach Valuation Technique | Fair Value, Measurements, Recurring | Aluminum | Midwest premium swap contracts |  |
Financial Liabilities: |  |
Derivative Liability |  | (0.3)
Income Approach Valuation Technique | Fair Value, Measurements, Recurring | Level 1 | Aluminum | Midwest premium swap contracts |  |
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Income Approach Valuation Technique | Fair Value, Measurements, Recurring | Level 2 | Aluminum | Midwest premium swap contracts |  |
Financial Liabilities: |  |
Derivative Liability |  | 0.0
Income Approach Valuation Technique | Fair Value, Measurements, Recurring | Level 3 | Aluminum | Midwest premium swap contracts |  |
Financial Assets: |  |
Derivative Asset |  | 0.9
Financial Liabilities: |  |
Derivative Liability | $ (1.4) | $ (0.3)

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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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