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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Feb. 29, 2020 | May 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses |  | $ (2.7)
Total, Gross unrealized losses |  | (2.7)
Securities in an unrealized loss position for less than twelve months, Fair value |  | 9.4
Securities in an unrealized loss position for more than twelve months, Fair value | $ 1.4 | 558.5
Total, Fair value |  | 567.9
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses |  | (0.9)
Total, Gross unrealized losses |  | (0.9)
Securities in an unrealized loss position for less than twelve months, Fair value |  | 1.5
Securities in an unrealized loss position for more than twelve months, Fair value |  | 133.8
Total, Fair value |  | 135.3
General Obligation Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses |  | (0.3)
Total, Gross unrealized losses |  | (0.3)
Securities in an unrealized loss position for less than twelve months, Fair value |  | 3.0
Securities in an unrealized loss position for more than twelve months, Fair value |  | 168.3
Total, Fair value |  | 171.3
Pre-Refunded Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Fair value |  | 0.1
Securities in an unrealized loss position for more than twelve months, Fair value |  | 1.6
Total, Fair value |  | 1.7
Revenue Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses |  | (0.2)
Total, Gross unrealized losses |  | (0.2)
Securities in an unrealized loss position for less than twelve months, Fair value |  | 0.1
Securities in an unrealized loss position for more than twelve months, Fair value |  | 79.2
Total, Fair value |  | 79.3
U.S. Government Agency And Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for more 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 |  | 4.7
Securities in an unrealized loss position for more than twelve months, Fair value |  | 175.6
Total, Fair value |  | $ 180.3

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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=118939692&loc=d3e27337-111563 + Details
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