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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Feb. 28, 2021 | May 31, 2020
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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 | $ (4.4) | $ (1.7)
Total, Gross unrealized losses | (4.4) | (1.7)
Securities in an unrealized loss position for less than twelve months, Fair value | 435.2 | 66.8
Total, Fair value | 435.2 | 66.8
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 | 7.1 |
Total, Fair value | 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) | (0.1)
Total, Gross unrealized losses | (0.2) | (0.1)
Securities in an unrealized loss position for less than twelve months, Fair value | 22.6 | 6.5
Total, Fair value | 22.6 | 6.5
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 | (2.9) | (1.6)
Total, Gross unrealized losses | (2.9) | (1.6)
Securities in an unrealized loss position for less than twelve months, Fair value | 300.7 | 60.3
Total, Fair value | 300.7 | $ 60.3
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 | (1.3) |
Total, Gross unrealized losses | (1.3) |
Securities in an unrealized loss position for less than twelve months, Fair value | 104.8 |
Total, Fair value | $ 104.8 |

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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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