Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Feb. 28, 2023 |
Feb. 28, 2022 |
Feb. 28, 2023 |
Feb. 28, 2022 |
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| Unrealized losses on securities, tax | $ 3.3 | $ 16.5 | $ 23.3 | $ 27.1 |
| Cash dividends declared, per share | $ 0.79 | $ 0.66 | $ 2.37 | $ 1.98 |
| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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