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Funds Held for Clients and Corporate Investments (Funds Held for Clients and Corporate Investments) (Details) - USD ($) $ in Millions | Aug. 31, 2025 | May 31, 2025
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Schedule of Available-for-sale Securities [Line Items] |  |
Funds held for clients' money market securities and other restricted cash equivalents, Amortized cost | $ 775.2 | $ 1,057.8
Funds held for clients' money market securities and other restricted cash equivalents, Fair value | 775.2 | 1,057.8
AFS securities, Amortized cost | 4,997.8 | 3,809.1
AFS securities, Gross unrealized gains | 29.8 | 14.4
AFS securities, Gross unrealized losses | (50.8) | (68.0)
AFS securities, Fair value | 4,976.8 | 3,755.5
Other, Amortized cost | 34.3 | 33.1
Other, Gross unrealized gains | 3.5 | 2.3
Other, Gross unrealized losses | (0.5) | (0.9)
Other, Fair value | 37.3 | 34.5
Total funds held for clients and corporate investments, Amortized cost | 5,807.3 | 4,900.0
Total funds held for clients and corporate investments, Gross unrealized gains | 33.3 | 16.7
Total funds held for clients and corporate investments, Gross unrealized losses | (51.3) | (68.9)
Total funds held for clients and corporate investments, Fair value | 5,789.3 | 4,847.8
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 165.6 | 158.3
AFS securities, Gross unrealized gains | 1.6 | 0.9
AFS securities, Gross unrealized losses | (0.1) | 0.0
AFS securities, Fair value | 167.1 | 159.2
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 1,922.6 | 1,640.3
AFS securities, Gross unrealized gains | 20.0 | 10.7
AFS securities, Gross unrealized losses | (5.0) | (7.0)
AFS securities, Fair value | 1,937.6 | 1,644.0
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 973.2 | 1,017.3
AFS securities, Gross unrealized gains | 1.0 | 0.5
AFS securities, Gross unrealized losses | (33.2) | (44.3)
AFS securities, Fair value | 941.0 | 973.5
U.S. Government Agency And Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 1,111.8 | 993.2
AFS securities, Gross unrealized gains | 7.2 | 2.3
AFS securities, Gross unrealized losses | (12.5) | (16.7)
AFS securities, Fair value | 1,106.5 | $ 978.8
Variable Rate Demand Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 824.6 |
AFS securities, Fair value | $ 824.6 |

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