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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]
Unrecognized tax benefits that would impact effective tax rate	$ 2.1	$ 2.0
Unrecognized tax benefits that would affect the effective tax rate if recognized	1.3	1.1
Accrued interest related to uncertain tax positions	$ 1.0

This element represents the total of accruals as of the date of the statement of financial position for interest recognized 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 and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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