Employee Benefit Plans (Details) - Schedule Of Amounts Recognized In Balance Sheet - USD ($) $ in Millions	May 31, 2016	May 31, 2015
Pension Plans [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current assets	$ 10.1	$ 13.3
Current liabilities	0.0	0.0
Non-current liabilities	(10.7)	(12.6)
Net funded balance	(0.6)	0.7
Other Postretirement Benefits [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current assets	0.0	0.0
Current liabilities	(2.6)	(2.6)
Non-current liabilities	(35.7)	(33.7)
Net funded balance	$ (38.3)	$ (36.3)