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Investment Income, Net (Schedule of Investment Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
Investment Income, Net [Abstract] |  |  |  |  |  |
Interest income on corporate funds | $ 2.8 | $ 2.7 |  | $ 6.0 | $ 5.6 |
Interest expense | (0.8) | (1.3) |  | (1.7) | (2.1) |
Net gain from equity-method investments | 0.1 | 0.3 |  | 0.1 | 0.3 |
Investment income, net | $ 2.1 | $ 1.7 | [1] | $ 4.4 | $ 3.8 | [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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