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Other Expense, Net (Schedule of Other Expense, Net) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2021 | Feb. 29, 2020
Other Expense, Net [Abstract] |  |  |  |
Interest income on corporate investments | $ 0.3 | $ 3.1 | $ 1.4 | $ 10.9
Interest expense | (8.8) | (9.3) | (26.8) | (29.7)
Other | 2.5 | 0.3 | 6.8 | 3.4
Other expense, net | $ (6.0) | $ (5.9) | $ (18.6) | $ (15.4)

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