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Funds Held for Clients and Corporate Investments (Securities in Unrealized Loss Position) (Details) - USD ($) $ in Millions | Aug. 31, 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 | $ (143.2) | $ (116.2)
Securities in an unrealized loss position for less than twelve months, Fair value | 2,430.4 | 2,059.6
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (32.4) | (22.8)
Securities in an unrealized loss position for more than twelve months, Fair value | 243.1 | 200.7
Total, Gross unrealized losses | (175.6) | (139.0)
Total, Fair value | 2,673.5 | 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 | (1.2) | (0.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 48.8 | 48.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (0.4) | (0.3)
Securities in an unrealized loss position for more than twelve months, Fair value | 5.7 | 5.7
Total, Gross unrealized losses | (1.6) | (1.2)
Total, Fair value | 54.5 | 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 | (24.8) | (17.5)
Securities in an unrealized loss position for less than twelve months, Fair value | 634.3 | 425.4
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (3.5) | (1.5)
Securities in an unrealized loss position for more than twelve months, Fair value | 29.1 | 16.7
Total, Gross unrealized losses | (28.3) | (19.0)
Total, Fair value | 663.4 | 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 | (92.8) | (81.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 1,279.2 | 1,171.5
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (15.5) | (10.6)
Securities in an unrealized loss position for more than twelve months, Fair value | 111.5 | 86.6
Total, Gross unrealized losses | (108.3) | (92.5)
Total, Fair value | 1,390.7 | 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 | (24.4) | (15.9)
Securities in an unrealized loss position for less than twelve months, Fair value | 468.1 | 414.2
Securities in an unrealized loss position for more than twelve months, Gross unrealized losses | (13.0) | (10.4)
Securities in an unrealized loss position for more than twelve months, Fair value | 96.8 | 91.7
Total, Gross unrealized losses | (37.4) | (26.3)
Total, Fair value | $ 564.9 | $ 505.9

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