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Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2017 | Feb. 29, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock repurchased and retired, shares | 0.0 |  | 2.9 |
Common stock repurchased and retired, values |  |  | $ 166.2 |
Authorized in May 2014 [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Expiration date |  |  | May 31, 2017 |
Approved repurchase amount | $ 350.0 |  | $ 350.0 |
Common stock repurchased and retired, shares |  | 0.9 |  | 2.2
Common stock repurchased and retired, values |  | $ 45.0 | $ 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 |  | $ 350.0 |
Common stock repurchased and retired, values |  |  | $ 106.5 |
Common Stock [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock issued in connection with exercise or vesting of stock-based awards | 0.4 | 0.1 | 1.8 | 1.2

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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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