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Income Taxes (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Income Taxes
Total unrecognized tax benefits	$ 1.7	$ 1.4
Accrued interest (net of tax benefit) related to uncertain tax positions	$ 0	$ (0.2)

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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