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Goodwill and Intangible Assets, Net of Accumulated Amortization (Components of Intangible Assets, at Cost) (Details) - USD ($) $ in Millions | May 31, 2025 | May 31, 2024
--- | --- | ---
Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 2,523.1 | $ 698.2
Less: Accumulated amortization | 575.8 | 503.7
Intangible assets, net of accumulated amortization | 1,947.3 | 194.5
Other Intangible Assets [Member] |  |
Intangible Assets [Line Items] |  |
Total intangible assets, gross | 314.7 | 23.1
Client Lists [Member] |  |
Intangible Assets [Line Items] |  |
Total intangible assets, gross | 1,797.9 | $ 675.1
Acquired Developed Software [Member] |  |
Intangible Assets [Line Items] |  |
Total intangible assets, gross | $ 410.5 |

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