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Basic and Diluted Earnings Per Share (Narrative) (Details) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2016 USD ($) shares | Aug. 31, 2016 shares | Nov. 30, 2015 shares | Nov. 30, 2016 USD ($) item shares | Nov. 30, 2015 USD ($) shares
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of stock repurchase programs | item |  |  |  | 2 |
Common shares repurchased and retired | shares | 2.9 | 0.0 | 0.0 | 2.9 |
Common stock repurchased and retired | $ 166.2 |  |  | $ 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 |  |  |  | $ 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 |  |  |  | $ 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 | shares | 0.1 |  | 0.4 | 1.4 | 1.1
Common Stock [Member] | Authorized in May 2014 [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common shares repurchased and retired | shares |  |  |  |  | 1.3
Common stock repurchased and retired |  |  |  |  | $ 62.9

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