Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($) shares in Millions, $ in Millions |
1 Months Ended | 12 Months Ended | ||
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Jul. 31, 2016 |
May 31, 2018 |
May 31, 2017 |
May 31, 2016 |
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| Equity, Class of Treasury Stock [Line Items] | ||||
| Common stock repurchased and retired, shares | 2.9 | |||
| Common stock repurchased and retired, values | $ 143.1 | $ 166.2 | $ 107.9 | |
| Authorized in July 2016 [Member] | ||||
| Equity, Class of Treasury Stock [Line Items] | ||||
| Expiration date | May 31, 2019 | |||
| Approved repurchase amount | $ 350.0 | |||
| Common stock repurchased and retired, shares | 2.5 | |||
| Common stock repurchased and retired, values | $ 143.1 | |||
| Previously Authorized Repurchase Program [Member] | ||||
| Equity, Class of Treasury Stock [Line Items] | ||||
| Common stock repurchased and retired, values | $ 59.7 | |||
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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 Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format. 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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