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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This element represents the total of accruals as of the date of the statement of financial position for interest 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 and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013
Income Tax Contingency [Line Items]
Effective income tax rate	(2.60%)	(390.10%)
Unrecognized tax benefits that would impact effective tax rate	$ 31.1
Income tax penalties and interest accrued	1.2		1.2
Removal of uncertain tax benefit would affect forecasted annual effective tax	0.9
Minimum [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits	35.0
Maximum [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 36.6