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Derivative Instruments and Risk Management (Tables)	3 Months Ended
	Mar. 31, 2013
Derivative Instruments and Risk Management [Abstract]
Summary of commodity swaps	Summary of commodity swaps
Summary of foreign currency forward exchange contracts which have not been designated as hedging instruments, and their impact on the income statement	Summary of foreign currency forward exchange contracts which have not been designated as hedging instruments and their impact on the income statement

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Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

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Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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