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Other (Expense)/Income, Net (Schedule of Other (Expense)/Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2018
Other (Expense)/Income, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income on corporate investments |  |  |  |  |  |  |  |  | $ 12.3 | $ 13.3 | $ 11.9
Interest expense |  |  |  |  |  |  |  |  | (38.8) | (17.6) | (3.9)
Other |  |  |  |  |  |  |  |  | 3.1 | 1.0 | 0.6
Other (expense)/income, net | $ (8.0) | $ (5.9) | $ (4.7) | $ (4.8) | $ (4.0) | $ (3.7) | $ 2.1 | $ 2.3 | $ (23.4) | $ (3.3) | $ 8.6

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