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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes [Abstract]
Effective tax rate (in hundredths)	10.40%	13.30%	11.40%	14.00%
Unrecognized tax benefits	$ 0.2		$ 0.2
Income Tax Contingency [Line Items]
Accrued interest relating to unrecognized tax benefits, maximum	$ 0.1		$ 0.1

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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