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Income Taxes - Schedule of Current and Deferred Income Tax Liabilities (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Deferred Income Tax Liabilities	$ 17.7	$ 7.3
Unrecognized Tax Benefits	7.4	7.8
Liabilities for Income Taxes	$ 25.1	$ 15.1

The cumulative amount for all deferred tax liabilities as of the balance sheet date arising from temporary differences between accounting income in accordance with generally accepted accounting principles and tax-basis income that will result in future taxable income exceeding future accounting income.

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