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Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Aug. 31, 2024 | May 31, 2024
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Funds Held for Clients and Corporate Investments [Abstract] |  |
Funds held for clients | $ 3,763.2 | $ 3,706.2
Corporate investments | 38.4 | 33.9
Long-term corporate investments |  | 3.7
Total funds held for clients and corporate investments, Fair value | $ 3,801.6 | $ 3,743.8

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