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Income Taxes (Details)	3 Months Ended		12 Months Ended
Income Taxes (Details)	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Taxes
Estimated annual effective tax rate (as a percent)	30.00%	29.00%	26.50%

- 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.

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