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Earnings (Loss) Per Share (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Earnings Per Share [Abstract]
Undistributed Earnings Allocated to Participating Securities		$ 0.1	$ 0.2	$ 0.1	$ 0.1
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares)		1.3
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 13.4			$ 13.4

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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