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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Nov. 30, 2024 | May 31, 2024
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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 | $ (5.3) | $ (23.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 601.4 | 1,068.9
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (89.9) | (141.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 1,783.1 | 2,102.7
Total, Gross unrealized losses | (95.2) | (164.2)
Total, Fair value | 2,384.5 | 3,171.6
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 |  | (0.4)
Securities in an unrealized loss position for less than twelve months, Fair value | 17.4 | 77.4
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.2) | (0.7)
Securities in an unrealized loss position for more than twelve months, Fair value | 8.6 | 43.0
Total, Gross unrealized losses | (0.2) | (1.1)
Total, Fair value | 26.0 | 120.4
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 | (1.3) | (8.4)
Securities in an unrealized loss position for less than twelve months, Fair value | 359.8 | 620.8
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (10.6) | (24.4)
Securities in an unrealized loss position for more than twelve months, Fair value | 335.8 | 647.8
Total, Gross unrealized losses | (11.9) | (32.8)
Total, Fair value | 695.6 | 1,268.6
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 | (3.2) | (8.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 47.1 | 102.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (55.9) | (78.9)
Securities in an unrealized loss position for more than twelve months, Fair value | 912.8 | 864.7
Total, Gross unrealized losses | (59.1) | (86.9)
Total, Fair value | 959.9 | 967.2
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) | (6.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 177.1 | 268.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (23.2) | (37.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 525.9 | 547.2
Total, Gross unrealized losses | (24.0) | (43.4)
Total, Fair value | $ 703.0 | $ 815.4

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