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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Aug. 31, 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 | $ (4.5) | $ (23.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 116.1 | 1,068.9
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (93.5) | (141.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 1,889.9 | 2,102.7
Total, Gross unrealized losses | (98.0) | (164.2)
Total, Fair value | 2,006.0 | 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 | 2.4 | 77.4
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.3) | (0.7)
Securities in an unrealized loss position for more than twelve months, Fair value | 25.0 | 43.0
Total, Gross unrealized losses | (0.3) | (1.1)
Total, Fair value | 27.4 | 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 | (0.1) | (8.4)
Securities in an unrealized loss position for less than twelve months, Fair value | 14.4 | 620.8
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (12.3) | (24.4)
Securities in an unrealized loss position for more than twelve months, Fair value | 424.7 | 647.8
Total, Gross unrealized losses | (12.4) | (32.8)
Total, Fair value | 439.1 | 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 | (4.3) | (8.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 59.4 | 102.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (57.1) | (78.9)
Securities in an unrealized loss position for more than twelve months, Fair value | 910.1 | 864.7
Total, Gross unrealized losses | (61.4) | (86.9)
Total, Fair value | 969.5 | 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 | (0.1) | (6.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 39.9 | 268.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (23.8) | (37.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 530.1 | 547.2
Total, Gross unrealized losses | (23.9) | (43.4)
Total, Fair value | $ 570.0 | $ 815.4

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