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Treasury Stock (Tables) | 12 Months Ended
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May. 31, 2015
Stockholders' Equity Attributable to Parent [Abstract] |
Tabular disclosure of entity's treasury stock | 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 |
September 2010 | $44.0 | (a)
Less repurchases | (34.1 | ) |
Remaining Board authorization at May 31, 2015 | $ | 9.9 |  |
(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.

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- Definition Tabular disclosure of an entity's treasury stock including amount authorized by an entity's board of directors, the number of shares repurchased and the remaining maximum dollar value of shares available for repurchase under the program + References No definition available. + Details
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