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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Unrecognized tax benefits
Uncertain tax positions resolved	$ 0
Tax benefits	14.2	13.7
Accrued interest expense related to unrecognized tax benefits, gross of tax	$ 2.1	$ 1.9

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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