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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fair value | Senior unsecured notes |  |
Long-term Debt |  |
Debt | $ 321.0 | $ 309.8
Fair value | Other fixed rate debt |  |
Long-term Debt |  |
Debt | 150.0 | 145.4
Fair value | Variable rate debt |  |
Long-term Debt |  |
Debt | 283.9 | 298.1
Carrying value | Senior unsecured notes |  |
Long-term Debt |  |
Debt | 298.5 | 298.3
Carrying value | Other fixed rate debt |  |
Long-term Debt |  |
Debt | 151.4 | 140.7
Carrying value | Variable rate debt |  |
Long-term Debt |  |
Debt | $ 283.9 | $ 298.1

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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 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 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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