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Income Taxes (Reconciliation of Gross Unrecognized Tax Benefits, Not Including Interest or Other Potential Offsetting Effects) (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Income Taxes [Abstract] |  |  |
Balance as of beginning of fiscal year | $ 22.1 | $ 14.9 | $ 43.7
Additions for tax positions of the current year | 4.1 | 3.8 | 2.3
Additions for tax positions of prior years | 1.2 | 5.2 | 0.1
Reductions for tax positions of prior years | (0.6) |  | (1.2)
Settlements with tax authorities |  | (1.2) | (28.6)
Expiration of the statute of limitations | (0.6) | (0.6) | (1.4)
Balance as of end of fiscal year | $ 26.2 | $ 22.1 | $ 14.9

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