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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2024 | Nov. 30, 2023 | Nov. 30, 2024 | Nov. 30, 2023
Unrealized gains (losses) on securities, tax | $ 1.3 | $ 4.8 | $ 18.9 | $ 2.8
Reclassification adjustment for realized gains (loss) on securities, tax | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Cash dividends declared, per share | $ 0.98 | $ 0.89 | $ 1.96 | $ 1.78
Repurchases of common shares, excise taxes | $ 0.5 |  | $ 0.5 |
Authorized In July 2021 [Member] |  |  |  |
Expiration date |  |  | Jan. 31, 2024 |
Authorized In July 2021 [Member] | Maximum [Member] |  |  |  |
Approved repurchase amount | 400.0 |  | $ 400.0 |
Authorized In January 2024 [Member] |  |  |  |
Approved repurchase amount | $ 400.0 | $ 400.0 | $ 400.0 | $ 400.0
Expiration date |  |  | May 31, 2027 | Jan. 31, 2024

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