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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Feb. 28, 2013	Feb. 28, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 2.2	$ (29.9)
Unrecognized tax benefits, increase (decrease) in accrued interest	0.1	(1.0)
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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