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Indebtedness	3 Months Ended
Indebtedness	Mar. 31, 2013
Debt Disclosure [Abstract]
Indebtedness	Indebtedness Credit Facility In March 2013, we entered into a $750.0 million senior unsecured revolving credit facility, which we may choose to use for future working capital and general corporate purposes. The terms of this revolving credit facility include a financial covenant that require us to not exceed a maximum debt to EBITDA ratio. This facility terminates in March 2014. As of March 31, 2013, we had outstanding borrowings of $200.0 million and were in full compliance with all covenants. The weighted average interest rate on outstanding borrowings as of March 31, 2013 was 1.5%. Senior Notes On March 1, 2013, we repaid the $450.0 million aggregate principal amount of our 6.0% Senior Notes.

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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