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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, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Authorized in May 2014 [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock repurchased and retired, values |  |  |  | $ 59.7
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, shares | 0.0 | 0.0 | 1.6 | 2.9
Common stock repurchased and retired, values |  |  | $ 94.1 | $ 166.2
Common Stock [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock issued in connection with exercise or vesting of stock-based awards | 0.1 | 0.4 | 0.9 | 1.8
Common stock issued related to acquisition |  |  | 0.6 |

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