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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Statement of Stockholders' Equity [Abstract] |  |  |  |
Employee pension and postretirement benefits, tax | $ 2.6 | $ 17.3 | $ 19.4 | $ 8.6
Cash dividends declared per share on common stock (in dollars per share) | $ 0.37 | $ 1.48 | $ 1.32 | $ 1.20

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