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Other (Expense)/Income, Net (Schedule of Interest (Expense)/Income, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Other (Expense)/Income, Net [Abstract] |  |  |  |
Interest income on corporate investments | $ 3.1 | $ 3.1 | $ 10.9 | $ 9.1
Interest expense | (9.3) | (6.7) | (29.7) | (8.4)
Other | 0.3 | (0.1) | 3.4 |
Other (expense)/income, net | $ (5.9) | $ (3.7) | $ (15.4) | $ 0.7

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