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	Dec. 31, 2012
Differences between the U.S. federal statutory rate and the Company's effective tax rate for continuing operations
U.S. federal statutory tax rate (as a percent)	35.00%	35.00%	35.00%	35.00%
Unrecognized tax benefits	$ 1.0		$ 1.0		$ 0.8
Maximum
Unrecognized tax benefits
Interest and penalties charged to income tax expense because of the unrecognized tax benefits	$ 0.1	$ 0.1	$ 0.1	$ 0.1

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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This element represents the total of interest expense 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 in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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