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Interest (Expense)/Income, Net (Schedule of Interest (Expense)/Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | [1] | Feb. 28, 2018 | [1] | Nov. 30, 2017 | [1] | Aug. 31, 2017 | [1] | May 31, 2019 | May 31, 2018 | May 31, 2017
Interest (Expense)/Income, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income on corporate funds |  |  |  |  |  |  |  |  | $ 13.3 | $ 11.9 |  | $ 9.9 |
Interest expense |  |  |  |  |  |  |  |  | (17.6) | (3.9) |  | (2.5) |
Net gain/(loss) from equity-method investments |  |  |  |  |  |  |  |  | 1.0 | 0.6 |  | (2.2) |
Interest (expense)/income, net | $ (4.0) | $ (3.7) | $ 2.1 | $ 2.3 | $ 2.5 | $ 2.3 | $ 1.7 | $ 2.1 | $ (3.3) | $ 8.6 | [1],[2] | $ 5.2 | [2]
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[2] | 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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