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Fair Value (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2011 Fair Value Inputs - Level 2 [Member] | Dec. 31, 2010 Fair Value Inputs - Level 2 [Member] | Dec. 31, 2011 Senior Notes due 2013 [Member] | Dec. 31, 2011 Senior Notes due 2019 [Member]
Debt Instrument [Line Items] |  |  |  |  |
Face Value of Debt Instrument |  |  |  | $ 500,000,000 | $ 500,000,000
Maturity Date |  |  |  | Aug. 15, 2013 | Sep. 15, 2019
Fair Value of Debt Instrument |  |  |  | 540,000,000 | 583,000,000
Short-term debt | 67,000,000 |  |  |  |
Underlying risk | interest rate |  |  |  |
Notional amount | 500,000,000 |  |  |  |
Type of instrument | interest rate swap agreements |  |  |  |
Hedge designation | fair value hedges |  |  |  |
Amount of hedged item | 500,000,000 |  |  |  |
Description of hedged item | senior notes due 2013 |  |  |  |
Basis spread on Variable rate | 4.377% |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |
Interest Rate Fair Value Hedge Asset |  | $ 11,600,000 | $ 14,100,000 |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 + Details
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- Definition Estimated fair value of the debt instrument at the balance-sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 + Details
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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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- Definition The average percentage points added to the reference rate to compute the variable rate on the group of interest rate derivatives. + References No definition available. + Details
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- Definition Description of the hedged item related to the derivative. Includes the type of instrument hedged, contract amount, term, and so forth. + References No definition available. + Details
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- Definition Description of the type of derivative instrument, such as a swap, forward, and option. Excludes the underlying risk of the instrument. + References No definition available. + Details
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- Definition Description of the primary underlying risk exposure associated with the derivative. For example, interest rate risk, credit risk, foreign exchange rate risk, or overall price risk. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of all derivative assets designated as interest rate fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents notes payable 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, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 + Details
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