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Debt - Credit Facility (Narrative) (Details) (Revolving Credit Facility [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended
--- | ---
Jun. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Line of credit facility, remaining borrowing capacity | $ 409.8 | $ 345.2
Unused credit facility fee | 0.40% | 0.35%
Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | 70.6 | 134.0
Weighted Average [Member] | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit interest rate | 3.04% | 3.95%
Letter of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Letters of credit issued | 119.6 | 120.8
Line of credit facility, capacity available for issuance of letters of credit | $ 230.4 | $ 229.2
Letter of Credit [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit interest rate | 1.125% | 1.00%
Letter of Credit [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit interest rate | 2.25% | 2.00%

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- 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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Balance Type: | credit
Period Type: | instant

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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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Balance Type: | credit
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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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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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Balance Type: | na
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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 The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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