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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Unrecognized tax benefits
Decrease in income tax liability due to resolution of uncertain tax positions in the U.S.	$ 1.7
Decrease in deferred tax assets due to uncertain tax positions	0.7
Reconciliation of unrecognized tax benefits and interest related to unrecognized tax benefits
Unrecognized tax benefits	13.7	14.5
Accrued interest expense related to unrecognized tax benefits, gross of tax	$ 1.9	$ 1.6

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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