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Derivative Financial Instruments - Outstanding commodity and currency forward contracts designated as hedging (Details) - Designated as Hedging Instrument	9 Months Ended	12 Months Ended
	Sep. 30, 2016 JPY (¥) MMBTU T	Dec. 31, 2015 JPY (¥) MMBTU T	Sep. 30, 2016 KRW (₩)	Sep. 30, 2016 SGD	Sep. 30, 2016 GBP (£)	Sep. 30, 2016 EUR (€)	Sep. 30, 2016 AUD	Dec. 31, 2015 KRW (₩)	Dec. 31, 2015 SGD	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 AUD	Sep. 30, 2015 GBP (£)
Foreign currency exchange contracts | Australian Dollar
Derivative [Line Items]
Currency units hedged | AUD							AUD 3,598,634				AUD 0
Foreign currency exchange contracts | European Euro
Derivative [Line Items]
Currency units hedged | €						€ 21,875,317				€ 0
Foreign currency exchange contracts | South Korean Won
Derivative [Line Items]
Currency units hedged | ₩			₩ 496,671,700					₩ 1,533,257,930
Foreign currency exchange contracts | Singapore Dollar
Derivative [Line Items]
Currency units hedged | SGD				SGD 1,800,000					SGD 1,800,000
Foreign currency exchange contracts | British Pound
Derivative [Line Items]
Currency units hedged | £					£ 191,411							£ 0
Foreign currency exchange contracts | Japanese Yen
Derivative [Line Items]
Currency units hedged | ¥	¥ 133,928,500	¥ 245,915,700
Natural Gas | Commodity contracts
Derivative [Line Items]
Commodity units hedged, energy | MMBTU	62,875	175,617
Steel | Commodity contracts
Derivative [Line Items]
Commodity units hedged, mass | T	4,585	4,811

X

- 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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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- Definition

Nominal mass used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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