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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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X

- Definition

The number of years permitted for a tax operating loss carryback after the tax law change.

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- Definition

The number of years permitted for a tax operating loss carryback prior to the change in law.

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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

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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

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