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Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Income Tax Expense (Benefit) [Abstract]
Effective income tax rate continuing operations	31.50%
Federal statutory tax rate	35.00%
Unrecognized Tax Benefits, Probability Threshold of Realizing for Tax Benefits Recognition, Minimum Percentage	50.00%
Unrecognized Tax Benefits, Including Foreign Tax Credits and Penalties and Interest	$ 5.3

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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- Definition

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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