Basic and Diluted Earnings Per Share Basic and Diluted Earnings Per Share (Details Textual) - USD ($) shares in Millions, $ in Millions |
12 Months Ended | ||
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May. 31, 2015 |
May. 31, 2014 |
Oct. 31, 2012 |
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| Equity, Class of Treasury Stock [Line Items] | |||
| Stock Repurchased and Retired During Period, Value | $ 182.4 | $ 249.7 | |
| Share Repurchase Program 1 [Member] | |||
| Equity, Class of Treasury Stock [Line Items] | |||
| Stock Repurchased and Retired During Period, Shares | 6.2 | ||
| Share Repurchase Program, Authorized Amount | $ 350.0 | ||
| Stock Repurchased and Retired During Period, Value | $ 249.7 | ||
| Share Repurchase Program 2 [Member] | |||
| Equity, Class of Treasury Stock [Line Items] | |||
| Stock Repurchased and Retired During Period, Shares | 3.9 | ||
| Share Repurchase Program, Authorized Amount | $ 350.0 | ||
| Stock Repurchased and Retired During Period, Value | $ 182.4 | ||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of stock repurchase plan authorized. No definition available.
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- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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