Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes
U.S. federal statutory rate	35.00%
Effective income tax rate	25.40%
Income before income taxes, domestic operations	$ 22.5	$ 66.7
Income before income taxes, foreign operations	38.5	(15.1)
Uncertain income tax positions	27.7		37.9
Cash paid for income taxes	4.2
Prepaid tax payments	$ 1.5		$ 7.5

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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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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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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