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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2025 | Aug. 31, 2024
Unrealized gains on securities, tax | $ 8.4 | $ 20.2
Reclassification adjustment for realized gains (losses) on securities, tax | $ 0.0 | $ 0.0
Cash dividends declared, per share | $ 1.08 | $ 0.98
Authorized In May 2027 [Member] |  |
Approved repurchase amount | $ 400.0 |
Expiration date | May 31, 2027 |

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