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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Feb. 28, 2025 | 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 | $ (2.7) | $ (23.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 360.1 | 1,068.9
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (76.4) | (141.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 1,738.1 | 2,102.7
Total, Gross unrealized losses | (79.1) | (164.2)
Total, Fair value | 2,098.2 | 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 | 0.0 | (0.4)
Securities in an unrealized loss position for less than twelve months, Fair value | 3.0 | 77.4
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.1) | (0.7)
Securities in an unrealized loss position for more than twelve months, Fair value | 6.0 | 43.0
Total, Gross unrealized losses | (0.1) | (1.1)
Total, Fair value | 9.0 | 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 | (0.6) | (8.4)
Securities in an unrealized loss position for less than twelve months, Fair value | 249.2 | 620.8
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (8.3) | (24.4)
Securities in an unrealized loss position for more than twelve months, Fair value | 280.3 | 647.8
Total, Gross unrealized losses | (8.9) | (32.8)
Total, Fair value | 529.5 | 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 | (1.7) | (8.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 29.5 | 102.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (49.0) | (78.9)
Securities in an unrealized loss position for more than twelve months, Fair value | 922.3 | 864.7
Total, Gross unrealized losses | (50.7) | (86.9)
Total, Fair value | 951.8 | 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 | (0.4) | (6.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 78.4 | 268.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (19.0) | (37.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 529.5 | 547.2
Total, Gross unrealized losses | (19.4) | (43.4)
Total, Fair value | $ 607.9 | $ 815.4

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