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Funds Held for Clients and Corporate Investments (Funds Held for Clients and Corporate Investments) (Details) - USD ($) $ in Millions | Nov. 30, 2024 | May 31, 2024
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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 | $ 393.8 | $ 380.3
Funds held for clients' money market securities and other restricted cash equivalents, Fair value | 393.8 | 380.3
AFS securities, Amortized cost | 3,502.8 | 3,492.1
AFS securities, Gross unrealized gains | 9.3 | 1.7
AFS securities, Gross unrealized losses | (95.2) | (164.2)
AFS securities, Fair value | 3,416.9 | 3,329.6
Other, Amortized cost | 32.1 | 32.3
Other, Gross unrealized gains | 5.1 | 3.2
Other, Gross unrealized losses | (0.8) | (1.6)
Other, Fair value | 36.4 | 33.9
Total funds held for clients and corporate investments, Amortized cost | 3,928.7 | 3,904.7
Total funds held for clients and corporate investments, Gross unrealized gains | 14.4 | 4.9
Total funds held for clients and corporate investments, Gross unrealized losses | (96.0) | (165.8)
Total funds held for clients and corporate investments, Fair value | 3,847.1 | 3,743.8
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 143.9 | 135.7
AFS securities, Gross unrealized gains | 0.8 | 0.1
AFS securities, Gross unrealized losses | (0.2) | (1.1)
AFS securities, Fair value | 144.5 | 134.7
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 1,407.5 | 1,400.3
AFS securities, Gross unrealized gains | 6.3 | 1.3
AFS securities, Gross unrealized losses | (11.9) | (32.8)
AFS securities, Fair value | 1,401.9 | 1,368.8
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 1,048.2 | 1,060.1
AFS securities, Gross unrealized gains | 0.5 | 0.2
AFS securities, Gross unrealized losses | (59.1) | (86.9)
AFS securities, Fair value | 989.6 | 973.4
U.S. Government Agency And Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 903.2 | 896.0
AFS securities, Gross unrealized gains | 1.7 | 0.1
AFS securities, Gross unrealized losses | (24.0) | (43.4)
AFS securities, Fair value | $ 880.9 | $ 852.7

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