Employee Benefit Plans (Details) - Schedule Of Amounts Recognized In Balance Sheet (USD $) In Millions, unless otherwise specified	May 31, 2014	May 31, 2013
Pension Plans [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current assets	$ 19.4	$ 0
Current liabilities	0	0
Non-current liabilities	(11.4)	(11.8)
Net funded balance	8.0	(11.8)
Other Postretirement Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current assets	0	0
Current liabilities	(2.6)	(2.7)
Non-current liabilities	(30.8)	(33.5)
Net funded balance	$ (33.4)	$ (36.2)