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Derivative Financial Instruments and Related Hedging Programs, Notional Quantity Table (Details) - Dec. 31, 2016 mmlbs in Millions, $ in Millions | USD ($) MMBTU mmlbs | EUR (€) MMBTU mmlbs
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Not Designated as Hedging Instrument | Aluminum | Purchase |  |
Derivative [Line Items] |  |
Derivative notional amount | 149.0 | 149.0
Not Designated as Hedging Instrument | Aluminum | Sale |  |
Derivative [Line Items] |  |
Derivative notional amount | 0.4 | 0.4
Not Designated as Hedging Instrument | Midwest premium swap contracts | Purchase |  |
Derivative [Line Items] |  |
Derivative notional amount | 147.9 | 147.9
Not Designated as Hedging Instrument | Natural Gas | Purchase |  |
Derivative [Line Items] |  |
Derivative notional amount | MMBTU | 5,040,000 | 5,040,000
Designated as Hedging Instrument | Alloy Metal Hedge | Purchase |  |
Derivative [Line Items] |  |
Derivative notional amount | 4.0 | 4.0
Designated as Hedging Instrument | Foreign Exchange Contract | Purchase |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 2.2 | € 1,593,700
Designated as Hedging Instrument | Foreign Exchange Contract | Sale |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | € |  | € 633,600

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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