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Funds Held for Clients and Corporate Investments (Funds Held for Clients and Corporate Investments) (Details) - USD ($) $ in Millions | Feb. 28, 2025 | 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 | $ 780.4 | $ 380.3
Funds held for clients' money market securities and other restricted cash equivalents, Fair value | 780.4 | 380.3
AFS securities, Amortized cost | 3,473.0 | 3,492.1
AFS securities, Gross unrealized gains | 11.2 | 1.7
AFS securities, Gross unrealized losses | (79.1) | (164.2)
AFS securities, Fair value | 3,405.1 | 3,329.6
Other, Amortized cost | 33.0 | 32.3
Other, Gross unrealized gains | 3.7 | 3.2
Other, Gross unrealized losses | (1.1) | (1.6)
Other, Fair value | 35.6 | 33.9
Total funds held for clients and corporate investments, Amortized cost | 4,286.4 | 3,904.7
Total funds held for clients and corporate investments, Gross unrealized gains | 14.9 | 4.9
Total funds held for clients and corporate investments, Gross unrealized losses | (80.2) | (165.8)
Total funds held for clients and corporate investments, Fair value | 4,221.1 | 3,743.8
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 166.9 | 135.7
AFS securities, Gross unrealized gains | 1.1 | 0.1
AFS securities, Gross unrealized losses | (0.1) | (1.1)
AFS securities, Fair value | 167.9 | 134.7
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 1,358.3 | 1,400.3
AFS securities, Gross unrealized gains | 7.2 | 1.3
AFS securities, Gross unrealized losses | (8.9) | (32.8)
AFS securities, Fair value | 1,356.6 | 1,368.8
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 1,043.1 | 1,060.1
AFS securities, Gross unrealized gains | 0.5 | 0.2
AFS securities, Gross unrealized losses | (50.7) | (86.9)
AFS securities, Fair value | 992.9 | 973.4
U.S. Government Agency And Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS securities, Amortized cost | 904.7 | 896.0
AFS securities, Gross unrealized gains | 2.4 | 0.1
AFS securities, Gross unrealized losses | (19.4) | (43.4)
AFS securities, Fair value | $ 887.7 | $ 852.7

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