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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets: |  |
Cash surrender value of life insurance policies | $ 21.4 | $ 17.0
Liabilities: |  |
Deferred compensation plan | 13.8 | 12.1
Total liabilities | 48.1 | 49.7
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Cash surrender value of life insurance policies |  |
Liabilities: |  |
Deferred compensation plan |  |
Total liabilities |  |
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Cash surrender value of life insurance policies | 21.4 | 17.0
Liabilities: |  |
Deferred compensation plan | 13.8 | 12.1
Total liabilities | 48.1 | 49.7
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets: |  |
Cash surrender value of life insurance policies |  |
Liabilities: |  |
Deferred compensation plan |  |
Total liabilities |  |
Cash flow swaps designated as hedges [Member] |  |
Liabilities: |  |
Cash flow swaps | 31.4 | 32.5
Cash flow swaps designated as hedges [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Liabilities: |  |
Cash flow swaps |  |
Cash flow swaps designated as hedges [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Liabilities: |  |
Cash flow swaps | 31.4 | 32.5
Cash flow swaps designated as hedges [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Liabilities: |  |
Cash flow swaps |  |
Cash flow swaps not designated as hedges [Member] |  |
Liabilities: |  |
Cash flow swaps | 2.9 | 5.1
Cash flow swaps not designated as hedges [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Liabilities: |  |
Cash flow swaps |  |
Cash flow swaps not designated as hedges [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Liabilities: |  |
Cash flow swaps | 2.9 | 5.1
Cash flow swaps not designated as hedges [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Liabilities: |  |
Cash flow swaps |  |

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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 FASB Technical Bulletin (FTB) -Number 85-4 -Paragraph 2 -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 210.5-02.17) -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 17 -Article 5 Reference 4: 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=6361293&loc=d3e6812-107765 + Details
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