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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Aug. 31, 2021 | May 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | $ (1.7) | $ (4.0)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.1) |
Total, Gross unrealized losses | (1.8) | (4.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 268.7 | 419.9
Securities in an unrealized loss position for more than twelve months, Fair value | 5.2 |
Total, Fair value | 273.9 | 419.9
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Fair value | 6.0 | 7.1
Total, Fair value | 6.0 | 7.1
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (0.2) | (0.2)
Total, Gross unrealized losses | (0.2) | (0.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 32.5 | 22.0
Total, Fair value | 32.5 | 22.0
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (0.7) | (2.3)
Total, Gross unrealized losses | (0.7) | (2.3)
Securities in an unrealized loss position for less than twelve months, Fair value | 126.5 | 288.2
Total, Fair value | 126.5 | 288.2
U.S. Government Agency And Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (0.8) | (1.5)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.1) |
Total, Gross unrealized losses | (0.9) | (1.5)
Securities in an unrealized loss position for less than twelve months, Fair value | 103.7 | 102.6
Securities in an unrealized loss position for more than twelve months, Fair value | 5.2 |
Total, Fair value | $ 108.9 | $ 102.6

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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