Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions	6 Months Ended	12 Months Ended
Nov. 30, 2024 USD ($) Security	May 31, 2024 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
Net unrealized losses on available-for-sale securities	$ (85.9)	$ (162.5)
Number of available-for-sale securities in an unrealized loss position \| Security	727	957
Percentage of available-for-sale securities in an unrealized loss position	73.00%	95.00%
Gross unrealized losses on available-for-sale securities	$ 95.2	$ 164.2
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on available-for-sale securities	$ 11.9	32.8
Corporate Bonds [Member] \| Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities maturity date	Dec. 15, 2024
Corporate Bonds [Member] \| Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities maturity date	Jul. 23, 2030
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized losses on available-for-sale securities	$ 59.1	$ 86.9
Municipal Bonds [Member] \| Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities maturity date	Dec. 01, 2024
Municipal Bonds [Member] \| Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities maturity date	Aug. 01, 2032
Variable Rate Demand Notes [Member] \| Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities contractual maturities	20 years
Variable Rate Demand Notes [Member] \| Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities contractual maturities	30 years

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