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Accrued Severance (Details) - Schedule of accrued severance cost associated with cost reduction measures (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Restructuring Reserve [Roll Forward]
Severance	$ 11.3	$ 13.4	$ 14.9
Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning balance	3.3	2.7
Accruals	11.3	13.4
Payments	(13.4)	(12.8)
Ending balance	1.2	3.3
Severance	$ 10.8	$ 9.6

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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