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Credit Facility (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | May 31, 2011
Line of Credit Facility [Line Items] |  |  |
Credit Facilities, total facility | $ 1,000.0 |  |
Credit Facilities, weighted-average interest rate |  | 5.00% |
Credit Agreement, expiration date | May 31, 2016 |  |
Credit Agreement, borrowing capacity prior to amendment |  |  | 650.0
Credit Agreement, limit on letters of credit | 200.0 |  |
Credit Agreement, margin for base rate advances | 0.40% |  |
Credit Agreement, margin for Eurocurrency rate advances | 1.40% |  |
Credit Agreement, annual rate for fronting fees accrued on letters of credit | 0.25% |  |
Credit Agreement, facility fee annual rate | 0.35% |  |
Covenant Modification Expiration Date | Aug. 15, 2013 |  |
Committed credit agreement |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit Facilities, total facility | 1,000.0 | 1,000.0 |
Credit Facilities, amount outstanding | 0 | 0 |
Credit Facilities, letters of credit | 15.1 | 16.2 |
Credit Facilities, total available | 984.9 | 983.8 |
Uncommitted credit agreements |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit Facilities, total facility | 317.2 | 458.3 |
Credit Facilities, amount outstanding | 172.1 | 153.5 |
Credit Facilities, letters of credit | 3.3 | 2.6 |
Credit Facilities, total available | $ 141.8 | 302.2 |
Credit Facilities, weighted-average interest rate | 4.00% | 5.00% |

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- Definition Maximum borrowing capacity, prior to the most recent amendment, under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
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- Definition Line of Credit Facility Limits on Letters of Credit + References No definition available. + Details
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- Definition Margin for base rate advances under the Credit Agreement. + References No definition available. + Details
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- Definition Margin for Eurocurrency rate advances under the Credit Agreement. + 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 Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 The effective interest rate at the end of the reporting period. + 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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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 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 3: 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 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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