Income Taxes - Schedule of Current and Deferred Income Tax Assets (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Current Income Tax Assets	$ 40.1	$ 39.3
Deferred Income Tax Assets	8.1	9.4
Valuation Allowance for State Income Taxes	(7.3)	(9.1)
Current and Deferred Income Tax Assets	$ 40.9	$ 39.6

The sum of the tax effects as of the balance sheet date of the amounts of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws ( before the valuation allowance, if any, to reduce such sum amount to net realizable value). Includes any tax benefit realized in deferred tax assets for significant impacts of tax planning strategies.

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The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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- Definition

Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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