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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Cash flow swaps designated as hedges | $ 4.0 |
Total assets | 28.3 | 21.4
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Cash surrender value of life insurance policies | 24.3 | 21.4
Liabilities: |  |
Deferred compensation plan | 15.0 | 13.8
Total liabilities | 39.7 | 48.1
Cash flow swaps designated as hedges [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Liabilities: |  |
Cash flow swaps | 22.4 | 31.4
Cash flow swaps not designated as hedges [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Liabilities: |  |
Cash flow swaps | $ 2.3 | $ 2.9

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + 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 210.5-02.17) -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 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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