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Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Nov. 30, 2023 | May 31, 2023
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Funds Held for Clients and Corporate Investments [Abstract] |  |
Funds held for clients | $ 5,439.7 | $ 4,118.8
Corporate investments | 34.4 | 373.4
Long-term corporate investments | 1.6 | 3.8
Total funds held for clients and corporate investments, Fair value | $ 5,475.7 | $ 4,496.0

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