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Financing Arrangements (Details 2) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 LIBOR | Dec. 31, 2011 Euro Libor | Dec. 31, 2012 Credit Agreement | Dec. 31, 2012 Base rate loans and swing line loans Minimum | Dec. 31, 2012 Base rate loans and swing line loans Maximum | Dec. 31, 2012 Base rate loans and swing line loans LIBOR | Dec. 31, 2012 Base rate loans and swing line loans Federal funds | Dec. 31, 2012 Eurocurrency rate loans LIBOR Minimum | Dec. 31, 2012 Eurocurrency rate loans LIBOR Maximum
Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Multi-currency borrowing capacity |  |  |  |  | $ 300 |  |  |  |  |  |
Term of senior unsecured revolving credit facility |  |  |  |  | 5 years |  |  |  |  |  |
Potential additional borrowing capacity |  |  |  |  | 150 |  |  |  |  |  |
Sublimit on letters of credit |  |  |  |  | 75 |  |  |  |  |  |
Interest rate added to base rate (as a percent) |  |  | 2.96% | 2.96% |  | 0.70% | 1.30% |  |  | 1.70% | 2.30%
Interest rate added to base rate (as a percent) |  |  |  |  |  |  |  | 1.00% | 0.50% |  |
Unused and available credit under the credit agreement |  |  |  |  | 265.4 |  |  |  |  |  |
Stand-by letters of credit outstanding | $ 34.8 | $ 34.9 |  |  | $ 34.6 |  |  |  |  |  |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: 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 2: 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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