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Debt	3 Months Ended
Debt	Mar. 31, 2012
Debt [Abstract]
Debt	3. Debt Based on borrowing rates currently available to us for loans with similar terms and maturities, the fair value of long-term debt was $3.4 billion at March 31, 2012 and $2.6 billion at December 31, 2011. The Company measures the fair value of its long-term debt using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market. In the first quarter of 2012, we issued $250 million of 4.70% senior unsecured notes and $500 million of 4.75% senior unsecured notes for net proceeds of approximately $247 million and $495 million, respectively. The 4.70% notes mature on March 15, 2037 and the 4.75% notes mature on March 15, 2042. In the first quarter of 2011, there was no significant debt activity.

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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