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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 49 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2019 | Aug. 31, 2019 | Nov. 30, 2018 | Nov. 30, 2019 | Aug. 31, 2019 | Mar. 21, 2018 | Jul. 22, 2015
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |  |  |  |
Authorized amount of stock to be repurchased | $ 100.0 |  |  | $ 100.0 |  | $ 50.0 | $ 50.0
Total current Board authorizations | (7.1) | $ (12.6) | $ 0.0 | (19.6) | $ (66.8) |  |
Less repurchases made under these authorizations | $ 33.2 |  |  | $ 33.2 |  |  |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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