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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Feb. 28, 2022 | 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 | $ (35.9) | $ (4.0)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (11.7) |
Total, Gross unrealized losses | (47.6) | (4.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 1,116.9 | 419.9
Securities in an unrealized loss position for more than twelve months, Fair value | 207.8 |
Total, Fair value | 1,324.7 | 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, Gross unrealized losses | (0.3) |
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.2) |
Total, Gross unrealized losses | (0.5) |
Securities in an unrealized loss position for less than twelve months, Fair value | 15.0 | 7.1
Securities in an unrealized loss position for more than twelve months, Fair value | 5.9 |
Total, Fair value | 20.9 | 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 | (5.1) | (0.2)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.8) |
Total, Gross unrealized losses | (5.9) | (0.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 139.7 | 22.0
Securities in an unrealized loss position for more than twelve months, Fair value | 17.4 |
Total, Fair value | 157.1 | 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 | (28.2) | (2.3)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (4.9) |
Total, Gross unrealized losses | (33.1) | (2.3)
Securities in an unrealized loss position for less than twelve months, Fair value | 778.9 | 288.2
Securities in an unrealized loss position for more than twelve months, Fair value | 88.3 |
Total, Fair value | 867.2 | 288.2
U.S. Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for less than twelve months, Gross unrealized losses | (2.3) | (1.5)
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (5.8) |
Total, Gross unrealized losses | (8.1) | (1.5)
Securities in an unrealized loss position for less than twelve months, Fair value | 183.3 | 102.6
Securities in an unrealized loss position for more than twelve months, Fair value | 96.2 |
Total, Fair value | $ 279.5 | $ 102.6

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