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Derivative Financial Instruments and Related Hedging Programs, Material Derivative Positions (Details) | Mar. 31, 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 | 79.00% |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 54.00% |
2017 |  |
Derivative [Line Items] |  |
Percentage of natural gas purchases for which the Company's exposure to fluctuations in gas prices had been substantially reduced | 73.00% |
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 | 27.00% |
Not Designated as Hedging Instrument | Aluminum | Option on Securities [Member] | Purchase |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 2.0 |
Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts | Purchase |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 128.4 |
Not Designated as Hedging Instrument | Aluminum | Fixed priced contracts | Sales |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 2.2 |
Not Designated as Hedging Instrument | Aluminum | Midwest premium swap contracts | Purchase |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | 92.0 |
Not Designated as Hedging Instrument | Natural Gas | Fixed priced contracts | Purchase |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount | MMBTU | 7,070,000 |
Designated as Hedging Instrument [Member] | Foreign Currency Member | Fixed priced contracts | Purchase |  |
Derivative [Line Items] |  |
Notional amount of contracts | € | € 3,950,374 | € 4,699,750

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