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Derivative Financial Instruments and Related Hedging Programs, Material Derivative Positions (Details) | Jun. 30, 2016 EUR (€) MMBTU mmlbs | Dec. 31, 2015 EUR (€)
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Remainder of 2016 |  |
Derivative [Line Items] |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced | 81.00% |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 55.00% |
2017 |  |
Derivative [Line Items] |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced | 74.00% |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 54.00% |
2018 |  |
Derivative [Line Items] |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced | 72.00% |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 36.00% |
Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts | Purchase |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 182.5 |
Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts | Sales |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 0.9 |
Not Designated as Hedging Instrument | Aluminum | Midwest premium swap contracts | Purchase |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 157.1 |
Not Designated as Hedging Instrument | Natural Gas | Fixed priced contracts | Purchase |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | MMBTU | 5,950,000 |
Designated as Hedging Instrument [Member] | Foreign Currency Member | Fixed priced contracts | Purchase |  |
Derivative [Line Items] |  |
Notional amount of contracts | € | € 2,020,950 | € 4,700,000

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