Treasury Stock (Tables)

9 Months Ended

Feb. 29, 2012

Authorizations Made By Board Of Directors To Repurchase Common Stock [Table Text Block]

Authorization	Amount
December 2007	$	20.0
May 2008		20.0
November 2008		10.0
February 2009		5.0
December 2009		20.0
September 2010		44.0	(a)
Subtotal	$	119.0
Less repurchases made from December 2007 through February 2012		(80.1	)
Remaining Board authorization at February 29, 2012	$	38.9