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Financial instruments and hedging activities, concentrations of credit risk and fair value of financial instruments.

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Fixed interest rate on hedged debt.

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Percentage of cash and cash equivalents held at two financial institutions.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds.

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Aggregate notional amount of all price risk derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the number of currency units specified in the price risk derivative contract. Excludes notional amount expressed in nonmonetary terms such as for a commodity forward contract.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Financial Instruments and Hedging Activities, Concentrations of Credit Risk and Fair Value of Financial Instruments (Details Textual)	9 Months Ended				1 Months Ended
	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Dec. 31, 2010 USD ($)	Oct. 25, 2005 EUR (€)	Oct. 31, 2005 Fixed-rate debt maturing in November 2012 USD [Member] USD ($)	Oct. 31, 2005 Fixed-rate debt maturing in November 2012 EUR [Member] EUR (€)	Sep. 30, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($)	Sep. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)	Dec. 31, 2010 Estimate of Fair Value, Fair Value Disclosure [Member] USD ($)
Debt Instrument [Line Items]
Fixed Interest rate on Hedged Debt					5.25%	3.55%
Long term debt					$ 325,000,000	€ 272,600,000
Proceeds from long term debt issuance					325,000,000	272,600,000
Fair Value of Financial Instruments Other than Derivatives (Textual) [Abstract]
Total Debt							1,430,000,000	1,430,000,000	1,550,000,000	1,520,000,000
Financial Instruments and Hedging Activities, Concentrations of Credit Risk and Fair Value of Financial Instruments (Textual) [Abstract]
Partially fund repayment of debt				300,000,000
Currency forward exchange contracts representing assets	38,800,000		48,700,000
Currency forward exchange contracts representing liabilities	28,000,000		38,300,000
Recognized net gain for commodity swaps	1,400,000	1,900,000
Net gains on derivatives designated as cash flow hedges to be reclassified during next 12 months	3,600,000
Contractual amount of commodity swap contracts	19,000,000		14,000,000
Aggregate notional value of other instruments	$ 119,700,000		$ 108,700,000
Concentration of Risk, Accounts Receivable	4.60%		5.00%
Percentage of cash and cash equivalents held at two financial institutions	32.00%