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Debt and Credit Arrangements Debt Narrative (Details) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 10.00% Senior Unsecured Notes due 2017 | Dec. 31, 2012 2.25% Senior Notes due 2017 | Nov. 08, 2012 2.25% Senior Notes due 2017 | Dec. 31, 2012 3.75% Senior Notes due 2023 | Nov. 08, 2012 3.75% Senior Notes due 2023 | Aug. 31, 2011 7.25% Senior Notes due 2011 | Dec. 31, 2012 4.00% Senior Notes due 2022 | Mar. 02, 2012 4.00% Senior Notes due 2022 | Mar. 31, 2012 4.25% Convertible Senior Notes due 2023
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  |  | $ 36.3 |  |  | $ 400.0
Repayment of Long Term Debt, Including Accrued and Unpaid Interest |  |  |  |  |  |  |  | 37.6 |  |  |
Debt Instrument, Frequency of Periodic Payment |  |  |  | semi-annually |  | semi-annually |  |  | semi-annually |  |
Debt Instrument, Date of First Required Payment |  |  |  | May 15, 2013 |  | Aug. 15, 2013 |  |  | Sep. 15, 2012 |  |
Repurchase Price Percentage Due to Change of Control |  |  |  | 101.00% |  | 101.00% |  |  | 101.00% |  |
Long-term Debt, Fair Value |  |  |  |  | 299.3 |  | 498.5 |  |  | 246.8 |
Unamortized debt issuance costs | 27.5 | 25.5 |  |  | 2.1 |  | 3.8 |  |  | 2.5 |
Debt Instrument, Call Date, Earliest |  |  | Jul. 15, 2013 |  |  |  |  |  |  |  |
Debt Early Redemption Premium |  |  | 105.00% |  |  |  |  |  |  |  |
Cash debt pooling arrangements, amount netted | $ 1,166.3 | $ 1,106.6 |  |  |  |  |  |  |  |  |

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- Definition Repayment of Long Term Debt, Including Accrued and Unpaid Interest + References No definition available. + Details
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- Definition Repurchase price of notes as a percent of the principal amount, plus accrued and unpaid interest of the debt, if there is a change of control as specified in the applicable notes' indenture. + References No definition available. + Details
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- Definition Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: 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. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 + Details
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