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Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |
Common stock repurchased and retired, shares | 2.9 |  |
Common stock repurchased and retired, values | $ 166.2 | $ 107.9 | $ 182.4
Authorized in May 2014 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Expiration date | May 31, 2017 |  |
Approved repurchase amount | $ 350.0 |  |
Common stock repurchased and retired, shares |  | 2.2 |
Common stock repurchased and retired, values | $ 59.7 | $ 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, values | $ 106.5 |  |

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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