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Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017 | Jul. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock issued in connection with exercise or vesting of stock-based awards | 0.1 | 0.3 | 0.6 | 0.8 |
Common stock issued related to acquisition |  |  |  | 0.6 |
Quarterly dividend per share | $ 0.56 | $ 0.50 | $ 1.12 | $ 1.00 |
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 | 0.0 | 0.0 | 0.5 | 1.6 |
Common stock repurchased and retired, values |  |  | $ 32.8 | $ 94.1 |

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