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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Nov. 30, 2012	Nov. 30, 2012
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Period Increase (Decrease)	$ (32.5)	$ (32.1)
Unrecognized tax benefits, decrease in accrued interest	1.2	1.1
Unrecognized tax benefits could decrease by approximately	$ 1.3	$ 1.3

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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