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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Statement Of Stockholders Equity [Abstract] |  |  |  |
Employee pension and postretirement benefits, tax | $ 0.2 | $ 0.9 | $ 0.4 | $ 1.0
Cash dividends declared per share on common stock (in dollars per share) | $ 0.30 | $ 0.27 | $ 0.60 | $ 0.54

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