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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Adjustment to the effective tax rate	0.50%	0.10%
Payment as a result of the settlement			$ 7.6
Refund from tax resolution			6.2
Unrecognized tax benefit that, if recognized, would favorably affect our effective income tax rate	11.0
Accrued interest related to uncertain tax positions	$ 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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