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Commitments and Contingencies (Details) - Income Taxes (USD $) In Millions	3 Months Ended
	Jun. 30, 2011
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Increases Resulting from Settlements with Taxing Authorities	$ 1.5
Unrecognized Tax Benefits, Period Increase (Decrease)	1.9
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Income Tax Reconciliation, Change in Enacted Tax Rate	$ (2.1)

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in the income tax rates under enacted tax laws in the period.

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