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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2021 | Feb. 29, 2020
Unrealized gains (losses) on securities, tax | $ 6.5 | $ 11.3 | $ 4.1 | $ 16.5
Reclassification adjustment for realized gains on securities, tax |  | $ 0.1 | $ 0.2 | $ 0.5
Cash dividends declared, per share | $ 0.62 | $ 0.62 | $ 1.86 | $ 1.86
Authorized In May 2019 [Member] |  |  |  |
Approved repurchase amount | $ 400.0 | $ 400.0 | $ 400.0 | $ 400.0
Expiration date | May 31, 2022 | May 31, 2022 | May 31, 2022 | May 31, 2022

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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 http://asc.fasb.org/extlink&oid=121641772&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 http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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