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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Nov. 30, 2022 | May 31, 2022
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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 | $ (92.7) | $ (116.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 1,782.7 | 2,059.6
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (126.6) | (22.8)
Securities in an unrealized loss position for more than twelve months, Fair value | 827.4 | 200.7
Total, Gross unrealized losses | (219.3) | (139.0)
Total, Fair value | 2,610.1 | 2,260.3
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 | (0.8) | (0.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 35.4 | 48.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (1.3) | (0.3)
Securities in an unrealized loss position for more than twelve months, Fair value | 14.1 | 5.7
Total, Gross unrealized losses | (2.1) | (1.2)
Total, Fair value | 49.5 | 54.2
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 | (23.4) | (17.5)
Securities in an unrealized loss position for less than twelve months, Fair value | 584.0 | 425.4
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (12.8) | (1.5)
Securities in an unrealized loss position for more than twelve months, Fair value | 93.7 | 16.7
Total, Gross unrealized losses | (36.2) | (19.0)
Total, Fair value | 677.7 | 442.1
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 | (38.6) | (81.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 721.7 | 1,171.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (95.1) | (10.6)
Securities in an unrealized loss position for more than twelve months, Fair value | 606.5 | 86.6
Total, Gross unrealized losses | (133.7) | (92.5)
Total, Fair value | 1,328.2 | 1,258.1
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 | (29.9) | (15.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 441.6 | 414.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (17.4) | (10.4)
Securities in an unrealized loss position for more than twelve months, Fair value | 113.1 | 91.7
Total, Gross unrealized losses | (47.3) | (26.3)
Total, Fair value | $ 554.7 | $ 505.9

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