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Debt	3 Months Ended
Debt	Mar. 31, 2013
Debt Disclosure [Abstract]
Debt	Debt In March 2013, the Company repaid the $600 million of 5.75% notes due March 15, 2013. During the three months ended March 31, 2012, the Company assumed $120 million of debt in the Dyrup acquisition; repaid $104 million of that debt, and repaid $71 million of 6.875% notes upon their maturity.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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