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Derivative Financial Instruments and Related Hedging Programs, Hedging Discussion (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) mmlbs | Jun. 30, 2014 USD ($) mmlbs | Jun. 30, 2015 EUR (€) mmlbs | Jun. 30, 2015 USD ($) mmlbs | Dec. 31, 2014 USD ($) | Mar. 29, 2010 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | $ 0.0 |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 0.0 |  |  |  |  |
Unrealized loss on foreign currency cash flow hedges | $ (0.2) | $ 0.0 | $ (0.2) | $ 0.0 |  |  |  |
Derivative Financial Instruments and Related Hedging Programs (Textuals) [Abstract] |  |  |  |  |  |  |  |
Aggregate fair value of derivative instruments that contain credit-risk-related contingency features that were in a net liability position |  |  |  |  |  | $ 15.7 | $ 11.4 |
Total fabricated products shipments containing fixed price terms | mmlbs |  |  | 91.5 | 68.5 |  |  |  |
Remainder of 2015 |  |  |  |  |  |  |  |
Derivative Financial Instruments and Related Hedging Programs (Textuals) [Abstract] |  |  |  |  |  |  |  |
Firm price customer sales contracts containing price risk on anticipated purchases of primary aluminum | mmlbs |  |  |  |  | 118.3 | 118.3 |  |
2016 |  |  |  |  |  |  |  |
Derivative Financial Instruments and Related Hedging Programs (Textuals) [Abstract] |  |  |  |  |  |  |  |
Firm price customer sales contracts containing price risk on anticipated purchases of primary aluminum | mmlbs |  |  |  |  | 16.7 | 16.7 |  |
Convertible Notes |  |  |  |  |  |  |  |
Derivative Financial Instruments and Related Hedging Programs (Textuals) [Abstract] |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  | $ 175.0
Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount | € |  |  |  |  | € 8,135,000 |  |  |
Derivative, Average Forward Exchange Rate |  |  |  |  | 1.14 | 1.14 |  |
Minimum | Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Remaining Maturity |  |  | 1 month |  |  |  |  |
Maximum | Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Remaining Maturity |  |  | 18 months |  |  |  |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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