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Basic and Diluted Earnings Per Share (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2019 | May 31, 2020 | May 31, 2019 | May 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock repurchased and retired, values |  | $ 171.9 | $ 56.9 | $ 143.1
Authorized In May 2019 [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Expiration date | May 31, 2022 |  |  |
Common stock repurchased and retired, shares |  | 2.0 |  |
Common stock repurchased and retired, values |  | $ 171.9 |  |
Previously Authorized Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common stock repurchased and retired, shares |  |  | 0.7 | 2.5
Common stock repurchased and retired, values |  |  | $ 56.9 | $ 143.1
Maximum [Member] | Authorized In May 2019 [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Approved repurchase amount | $ 400.0 |  | $ 400.0 |

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