Employee Benefit Plans (Details) - Schedule of changes in fair value level 3 assets (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012
Schedule of changes in fair value level 3 assets [Abstract]
Balance	$ 5.8	$ 5.7
Actual Return on Plan Assets:
Relating to assets still held	0.7	0.7
Purchases, sales and settlements, net	(0.3)	(0.3)
Foreign currency translation	(0.1)	(0.3)
Balance	$ 6.1	$ 5.8