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Unaudited Condensed Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Pension and OPEB adjustments, tax | $ 0.2 | $ 0.3
Change in fair value of derivatives, tax | $ 0.3 | $ 0.9
Dividends declared, per share (in dollars per share) | $ 0.28 | $ 0.26

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