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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Nov. 30, 2023 | May 31, 2023
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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 | $ (23.1) | $ (15.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 1,218.6 | 992.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (166.1) | (164.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 1,936.3 | 1,752.9
Total, Gross unrealized losses | (189.2) | (179.4)
Total, Fair value | 3,154.9 | 2,745.4
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 | (0.5) | (0.1)
Securities in an unrealized loss position for less than twelve months, Fair value | 63.0 | 54.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.9) | (1.3)
Securities in an unrealized loss position for more than twelve months, Fair value | 18.2 | 23.3
Total, Gross unrealized losses | (1.4) | (1.4)
Total, Fair value | 81.2 | 77.5
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 | (12.3) | (5.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 836.9 | 652.0
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (25.2) | (25.2)
Securities in an unrealized loss position for more than twelve months, Fair value | 477.1 | 382.7
Total, Gross unrealized losses | (37.5) | (31.1)
Total, Fair value | 1,314.0 | 1,034.7
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 | (4.8) | (5.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 71.2 | 86.7
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (100.2) | (99.4)
Securities in an unrealized loss position for more than twelve months, Fair value | 920.3 | 889.0
Total, Gross unrealized losses | (105.0) | (105.3)
Total, Fair value | 991.5 | 975.7
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 | (5.5) | (3.3)
Securities in an unrealized loss position for less than twelve months, Fair value | 247.5 | 199.6
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (39.8) | (38.3)
Securities in an unrealized loss position for more than twelve months, Fair value | 520.7 | 457.9
Total, Gross unrealized losses | (45.3) | (41.6)
Total, Fair value | $ 768.2 | $ 657.5

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