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Debt and Credit Agreements (Details) | 12 Months Ended |  |  |  |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2011 Commercial paper Short-term debt USD ($) | Dec. 31, 2012 U.S. commercial paper program USD ($) | Dec. 31, 2011 U.S. commercial paper program USD ($) | Dec. 31, 2012 U.S. commercial paper program Long-term debt USD ($) | Dec. 31, 2012 Euro commercial paper program USD ($) | Dec. 31, 2012 Euro commercial paper program EUR (€) | Dec. 31, 2012 Multi-year revolving credit facility USD ($) | Dec. 31, 2012 Bilateral credit facility USD ($) | Mar. 31, 2012 Credit Agreement USD ($) bank | Dec. 31, 2012 Multi-year revolving credit facility USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | $ 1,338,900,000 |  |  |  | $ 550,000,000 |  |  | $ 263,900,000 | € 200,000,000 | $ 525,000,000 | [1] | $ 25,000,000 | $ 525,000,000 |
Outstanding Balance | 89,497,000 |  |  | 40,000,000 | 39,497,000 | 40,000,000 | 39,500,000 | 0 |  | 50,000,000 | [1] |  |  |
Available Credit | 1,249,403,000 | [2] |  |  | 510,503,000 |  |  | 263,900,000 |  | 475,000,000 | [1] |  |  |
Maximum internal borrowing limit | 525,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lenders providing credit facility (in banks) |  |  |  |  |  |  |  |  |  |  |  |  | 14 |
Contingent increase to maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | 550,000,000 |
Variable basis of interest rates |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |
Write off of previously deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000
Short-term borrowings | $ 8,560,000 |  | $ 51,414,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate | 4.90% |  | 1.30% |  |  |  |  |  |  |  |  |  |  |
[1] | U.S.-based program.
[2] | Although the Company has significant available credit, in practice, the Company limits aggregate commercial paper and credit facility borrowings at any one-time to a maximum of $525 million (the amount of the back-up facility).

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- Definition Represents the aggregate maximum borrowings the entity allows at any one time under its commercial paper and credit facility programs, regardless of the limits under the individual programs. + References No definition available. + Details
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- Definition The contingent maximum borrowing capacity under the credit facility should the company exercise its option to do so under the credit facility. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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