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Investment Income, Net (Schedule of Investment Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017
Investment Income, Net [Abstract] |  |  |
Interest income on corporate funds | $ 3.2 | $ 2.9 |
Interest expense | (0.9) | (0.8) |
Investment income, net | $ 2.3 | $ 2.1 | [1]
[1] | Amounts have been adjusted to reflect the adoption of Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" ("ASC Topic 606").

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