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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2009 years | Dec. 31, 2008 years
Income Taxes |  |  |  |  |
Effective tax rate (as a percent) |  | 36.80% |  |  |
Estimated annual effective tax rate percentage (as a percent) |  | 36.80% | 36.20% |  |
Net operating loss carryback provision term before change in law (in years) |  |  |  | 2 | 2
Net operating loss carryback provision term after change in law (in years) |  |  |  | 5 | 5
Income tax refunds | $ 121.5 |  |  |  |

X
- Definition Estimated annual effective tax rate for current year which is calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. + Details
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- Details
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- Definition The number of years permitted for a tax operating loss carryback after the tax law change. + Details
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- Definition The number of years permitted for a tax operating loss carryback prior to the change in law. + Details
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- Definition A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 29 + Details
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