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Financing Arrangements (Details 2) (USD $) In Millions, unless otherwise specified |  |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Jun. 18, 2010 Prior Credit Agreement | Dec. 31, 2013 Prior Credit Agreement | Jun. 18, 2010 Prior Eurocurrency rate loans LIBOR | Jun. 18, 2010 Prior Eurocurrency rate loans LIBOR Minimum | Jun. 18, 2010 Prior Eurocurrency rate loans LIBOR Maximum | Jun. 18, 2010 Prior Eurocurrency rate loans Federal funds | Jun. 18, 2010 Prior Eurocurrency rate loans Prime Rate | Jun. 18, 2010 Prior base rate loans and swing line loans LIBOR | Jun. 18, 2010 Prior base rate loans and swing line loans LIBOR Minimum | Jun. 18, 2010 Prior base rate loans and swing line loans LIBOR Maximum | Dec. 31, 2013 Credit Agreement | Feb. 18, 2014 Credit Agreement Subsequent event | Feb. 18, 2014 Eurocurrency rate loans LIBOR Minimum Subsequent event | Feb. 18, 2014 Eurocurrency rate loans LIBOR Maximum Subsequent event | Feb. 18, 2014 Base rate loans and swing line loans LIBOR Subsequent event | Feb. 18, 2014 Base rate loans and swing line loans LIBOR Minimum Subsequent event | Feb. 18, 2014 Base rate loans and swing line loans LIBOR Maximum Subsequent event | Feb. 18, 2014 Base rate loans and swing line loans Federal funds Subsequent event | Feb. 18, 2014 Base rate loans and swing line loans Prime Rate Subsequent event
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multi-currency borrowing capacity |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |
Term of senior unsecured revolving credit facility |  |  | 5 years |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Potential additional borrowing capacity |  |  | 150 |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |
Sublimit on letters of credit |  |  | 75 |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |
Interest rate added to base rate (as a percent) |  |  |  |  |  | 1.70% | 2.30% |  |  |  | 0.70% | 1.30% |  |  | 0.975% | 1.45% |  | 0.00% | 0.45% |  |
Interest rate added to base rate (as a percent) |  |  |  |  |  |  |  | 0.50% |  | 1.00% |  |  |  |  |  |  | 1.00% |  |  | 0.50% |
Variable interest rate basis |  |  |  |  | LIBOR |  |  |  | Prime Rate | LIBOR |  |  |  |  |  |  |  |  |  |  | Prime Rate
Unused and available credit under the credit agreement |  |  |  | 276.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stand-by letters of credit outstanding | 23.6 | 34.8 |  | 23.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding | $ 305.5 | $ 307.5 |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |

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