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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, 2025 | May 31, 2024 | May 31, 2023
Income Tax Disclosure [Abstract] |  |  |
Balance as of beginning of fiscal year | $ 87.2 | $ 72.0 | $ 50.2
Additions for tax positions of the current year | 20.1 | 20.6 | 20.6
Additions for tax positions of prior years | 9.8 | 0.8 | 4.6
Reductions for tax positions of prior years | (5.5) | (3.8) | (2.1)
Settlements with tax authorities | 0.0 | (0.3) | (0.4)
Expiration of the statute of limitations | (5.6) | (2.1) | (0.9)
Balance as of end of fiscal year | $ 106.0 | $ 87.2 | $ 72.0

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