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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Aug. 31, 2025 | May 31, 2025
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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 | $ (3.3) | $ (3.0)
Securities in an unrealized loss position for less than twelve months, Fair value | 174.6 | 300.1
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (47.5) | (65.0)
Securities in an unrealized loss position for more than twelve months, Fair value | 1,559.6 | 1,651.4
Total, Gross unrealized losses | (50.8) | (68.0)
Total, Fair value | 1,734.2 | 1,951.5
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 | 0.0
Securities in an unrealized loss position for less than twelve months, Fair value |  | 16.4
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.1) | 0.0
Securities in an unrealized loss position for more than twelve months, Fair value | 2.8 | 2.8
Total, Gross unrealized losses | (0.1) | 0.0
Total, Fair value | 2.8 | 19.2
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 | (0.1) | (0.1)
Securities in an unrealized loss position for less than twelve months, Fair value | 56.5 | 83.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (4.9) | (6.9)
Securities in an unrealized loss position for more than twelve months, Fair value | 207.2 | 236.7
Total, Gross unrealized losses | (5.0) | (7.0)
Total, Fair value | 263.7 | 319.9
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 | (2.5) | (2.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 44.9 | 48.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (30.7) | (42.1)
Securities in an unrealized loss position for more than twelve months, Fair value | 843.2 | 880.1
Total, Gross unrealized losses | (33.2) | (44.3)
Total, Fair value | 888.1 | 928.6
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 | (0.7) | (0.7)
Securities in an unrealized loss position for less than twelve months, Fair value | 73.2 | 152.0
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (11.8) | (16.0)
Securities in an unrealized loss position for more than twelve months, Fair value | 506.4 | 531.8
Total, Gross unrealized losses | (12.5) | (16.7)
Total, Fair value | $ 579.6 | $ 683.8

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