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Income Taxes (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Income Taxes
Liability for unrecognized tax benefits	$ 47.7	$ 53.6
Liability for unrecognized tax benefit that would impact the effective tax rate, if recognized	45.5
Accrued interest on liability for unrecognized tax benefits	7.2	11.4
Expected reduction in the amount of unrecognized tax benefits	$ 14.5

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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