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Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017
Equity, Class of Treasury Stock [Line Items] |  |
Common stock issued in connection with exercise or vesting of stock-based awards | 0.5 | 0.5
Common stock issued related to acquisition |  | 0.6
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 | 0.5 | 1.6
Common stock repurchased and retired, values | $ 32.8 | $ 94.1

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