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Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Feb. 29, 2020 USD ($) security | May 31, 2019 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized gains on available-for-sale securities | $ | $ 84.1 | $ 19.7
Number of available-for-sale securities in an unrealized loss position | security | 2 | 269
Number of available-for-sale securities in an unrealized loss position for more than twelve months | security | 2 |
Securities in an unrealized loss position for more than twelve months, fair value | $ | $ 1.4 | $ 558.5
Number of available-for-sale securities in an unrealized loss position for less than twelve months | security | 0 |
U.S. Government Agency And Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities in an unrealized loss position for more than twelve months, fair value | $ |  | $ 175.6
Available-for-sale securities contractual maturities | 90 days |
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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