Treasury Stock (Tables)

6 Months Ended

Nov. 30, 2011

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(a)		44.0
Subtotal	$	119.0
Less Repurchases made from December 2007 to November 2011		(80.1	)
Remaining Board Authorization at November 30, 2011	$	38.9