Employee Benefit Plans (Details) - Schedule of changes in fair value level 3 assets (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6.1	$ 5.8
Actual Return on Plan Assets:
Relating to assets still held at year-end	(0.1)	0.7
Relating to assets sold during the year	0	0
Purchases, sales and settlements, net	(0.3)	(0.3)
Transfers in and/or out of Level 3	0	0
Foreign currency translation	0.5	(0.1)
Ending Balance	$ 6.2	$ 6.1