EMPLOYEE BENEFIT PLANS (Detail) - Schedule of change in benefit obligations (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Pension Plans, Defined Benefit [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	$ 173.9	$ 171.1
Service cost		0.3	0.1
Interest cost	8.4	8.9	9.7
Settlements		(7.5)
Actuarial losses	11.1	6.0
Foreign currency translation	(1.9)	3.7
Benefits paid, including expenses	(9.3)	(8.6)
Benefit obligation at end of year	182.2	173.9	171.1
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	38.3	34.4
Service cost	0
Interest cost	1.7	1.9	1.6
Plan participants’ contributions	0.4	0.5
Actuarial losses	1.7	4.7
Benefits paid, including expenses	(2.5)	(3.2)
Benefit obligation at end of year	$ 39.6	$ 38.3	$ 34.4