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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | May 31, 2023 | May 31, 2022
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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 | $ (15.2) | $ (116.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 992.5 | 2,059.6
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (164.2) | (22.8)
Securities in an unrealized loss position for more than twelve months, Fair value | 1,752.9 | 200.7
Total, Gross unrealized losses | (179.4) | (139.0)
Total, Fair value | 2,745.4 | 2,260.3
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 | (0.1) | (0.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 54.2 | 48.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (1.3) | (0.3)
Securities in an unrealized loss position for more than twelve months, Fair value | 23.3 | 5.7
Total, Gross unrealized losses | (1.4) | (1.2)
Total, Fair value | 77.5 | 54.2
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 | (5.9) | (17.5)
Securities in an unrealized loss position for less than twelve months, Fair value | 652.0 | 425.4
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (25.2) | (1.5)
Securities in an unrealized loss position for more than twelve months, Fair value | 382.7 | 16.7
Total, Gross unrealized losses | (31.1) | (19.0)
Total, Fair value | 1,034.7 | 442.1
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 | (5.9) | (81.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 86.7 | 1,171.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (99.4) | (10.6)
Securities in an unrealized loss position for more than twelve months, Fair value | 889.0 | 86.6
Total, Gross unrealized losses | (105.3) | (92.5)
Total, Fair value | 975.7 | 1,258.1
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 | (3.3) | (15.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 199.6 | 414.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (38.3) | (10.4)
Securities in an unrealized loss position for more than twelve months, Fair value | 457.9 | 91.7
Total, Gross unrealized losses | (41.6) | (26.3)
Total, Fair value | $ 657.5 | $ 505.9

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