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Funds Held for Clients and Corporate Investments (Classification of Investments on Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Aug. 31, 2025 | May 31, 2025
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Funds Held for Clients and Corporate Investments [Abstract] |  |
Funds held for clients | $ 4,927.4 | $ 4,813.3
Corporate investments | 861.9 | 34.5
Total funds held for clients and corporate investments, Fair value | $ 5,789.3 | $ 4,847.8

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- Definition Funds held for clients and corporate investments. + References No definition available. + Details
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- Definition Funds held for clients and corporate investments, fair value. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of investment in marketable security, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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