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Debt, Credit Facility (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Covenant Compliance | Our actual leverage for the four consecutive quarters ended March 31, 2013, was 1.7 which is below the maximum leverage of 3.5. Our actual interest coverage for the four consecutive quarters ended March 31, 2013, was 17.5 which is above the minimum interest coverage of 3.5. We were in compliance with all covenants at March 31, 2013. |  |  |
Long-term Debt | $ 1,239.9 |  | $ 914.5 |
Credit Agreement, covenant compliance, actual leverage ratio | 1.7 |  |  |
Credit Agreement, covenant terms, maximum leverage ratio | 3.5 |  |  |
Credit Agreement, covenant compliance, actual interest coverage ratio | 17.5 |  |  |
Credit Agreement, covenant terms, minimum interest coverage ratio | 3.5 |  |  |
2011 Credit Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Credit Agreement, available funds | 971.7 |  |  |
Letters of credit outstanding amount | 73.3 |  |  |
2011 Credit Agreement [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long-term Debt | $ 455.0 | [1] | $ 130.0 | [1]
[1] | Letters of credit outstanding under the 2011 Credit Agreement totaled $73.3 million and available funds under this facility were $971.7 million at March 31, 2013.

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- Definition Line of Credit Facility, Covenant Compliance, Actual Interest Coverage Ratio (measured as the ratio of adjusted earnings to interest expense) + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Actual Leverage Ratio (measured as the ratio of debt to adjusted earnings) + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Maximum Leverage Ratio (measured as the ratio of debt to adjusted earnings) + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Terms, Minimum Interest Coverage Ratio (measured as the ratio of adjusted earnings to interest expense) + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Identification of whether the entity has been in compliance with any credit facility debt covenants during the period. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- 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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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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