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Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
AOCI Attributable to Parent [Member] |  |  |  |
Pension and OPEB adjustments, tax | $ 0.3 |  | $ 0.8 |
Change in fair value of derivatives, tax | $ 0.2 |  | $ 0.4 |
Retained Earnings [Member] |  |  |  |
Dividends declared, per share (in dollars per share) | $ 0.20 | $ 0.18 | $ 0.58 | $ 0.52
Pension and OPEB adjustments, tax |  | $ 0.3 |  | $ 0.9
Change in fair value of derivatives, tax |  | $ 0.2 |  | $ 0.3
Dividends declared, per share (in dollars per share) | $ 0.20 | $ 0.18 | $ 0.58 | $ 0.52

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