Employee Benefit Plans (Details) - Schedule of change in benefit obligations (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Change in benefit obligation:
Settlement	$ (1.7)
Pension Plans [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	185.6	182.2
Service cost	0	0	0
Interest cost	7.2	6.9	8.4
Plan participants’ contributions	0	0
Actuarial losses (gains)	(2.5)	7.4
Foreign currency translation	3.7	(0.8)
Settlement	(6.4)	0
Benefits paid, including expenses	(7.1)	(10.1)
Benefit obligation at end of year	180.5	185.6	182.2
Other Postretirement Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	36.2	39.6
Service cost	0	0	0
Interest cost	1.3	1.4	1.7
Plan participants’ contributions	0.4	0.4
Actuarial losses (gains)	(1.9)	(2.8)
Foreign currency translation	0	0
Settlement	0	0
Benefits paid, including expenses	(2.6)	(2.4)
Benefit obligation at end of year	$ 33.4	$ 36.2	$ 39.6