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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Feb. 28, 2023 | Feb. 28, 2022 | Feb. 28, 2023 | Feb. 28, 2022
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

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 + Details
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