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Other Expense, Net (Schedule of Other Expense, Net) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2021 | May 31, 2020 | May 31, 2019
Other Expense, Net [Abstract] |  |  |
Interest income on corporate investments | $ 2.3 | $ 12.3 | $ 13.3
Interest expense | (35.8) | (38.8) | (17.6)
Other | 7.0 | 3.1 | 1.0
Other expense, net | $ (26.5) | $ (23.4) | $ (3.3)

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