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Income Taxes Details Textuals (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	$ 20.0
Unrecognized Tax Benefits, Interest on Income Taxes Expense	16.3
MRRT Effective tax rate	22.50%
MRRT market value starting base deferred tax asset	$ 0

This element represents interest expense recognized 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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