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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2025 | Feb. 29, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Unrealized gains (losses) on securities, tax | $ 4.3 | $ 6.3 | $ 23.2 | $ 3.5
Reclassification adjustment for realized earnings (losses) on securities, tax | $ 0.1 | $ 0.0 | $ 0.1 | $ 0.0
Cash dividends declared, per share | $ 0.98 | $ 0.89 | $ 2.94 | $ 2.67
Repurchases of common shares, excise taxes | $ 0.0 |  | $ 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
Authorized In January 19 2024 [Member] |  |  |  |
Expiration date |  |  |  | May 31, 2027
Authorized In January 19 2024 [Member] | Maximum [Member] |  |  |  |
Approved repurchase amount |  | $ 400.0 |  | $ 400.0

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-12 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A + Details
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