Treasury Stock (Tables)

12 Months Ended

May 31, 2013

Treasury Stock [Text Block]

Tabular Disclosure of an Entity's Treasury Stock [Table Text Block]

The Company has authorizations from the Board of Directors to repurchase Common Stock, from time to time as conditions allow, on the open market or through negotiated private transactions, as summarized in the table below:

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 May 2013		(99.4	)
Remaining Board authorization at May 31, 2013	$	19.6

(a) Represents the remainder of a $200.0 authorization after giving effect to the purchase of 5,199,699 shares at $30.00 per share pursuant to a large share repurchase in the form of a modified Dutch auction tender offer that was completed by the Company on November 3, 2010 for a total cost of $156.0, excluding related fees and expenses.