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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Total unrecognized tax benefits	$ 1.7	$ 1.7
Accrued interest (net of tax benefit) related to uncertain tax positions	0	0
Valuation allowance adjustment	0.7
Valuation allowance	96.2	95.5
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	93.4	92.0
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	$ 614.1	$ 612.6

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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- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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