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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Statement Of Stockholders Equity [Abstract] |  |  |
Employee pension and postretirement benefits, tax | $ 8.6 | $ 14.9 | $ 10.6
Cash dividends declared per share on common stock (in dollars per share) | $ 1.20 | $ 1.08 | $ 0.96

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