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Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2022 USD ($) Security | May 31, 2022 USD ($) Security
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized losses on available-for-sale securities | $ (217.8) | $ (136.3)
Number of available-for-sale securities in an unrealized loss position | Security | 1,105 | 817
Percentage of available-for-sale securities in an unrealized loss position | 97.00% | 64.00%
Gross unrealized losses on available-for-sale securities | $ 219.3 | $ 139.0
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 36.2 | 19.0
Corporate Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Dec. 01, 2022 |
Corporate Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Dec. 13, 2028 |
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 133.7 | $ 92.5
Municipal Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Dec. 01, 2022 |
Municipal Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Apr. 01, 2030 |
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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