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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Income Tax Disclosure [Abstract]
Effective tax rate	40.00%	41.00%
Accrued interest epense related to unrecognized income tax benefits	$ 0.4
Gross unrecognized tax benefits	2.5
Total amount of unrecognized tax benefits, if recognized, would affect the effective tax rate	$ 1.7

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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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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