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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	4 Months Ended	12 Months Ended
	Apr. 21, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Effective tax rate	35.90%	35.70%
Income tax refunds	$ 7.0

- 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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