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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Statement of Stockholders' Equity [Abstract] |  |  |  |
Employee pension and postretirement benefits, tax (benefit) expense | $ (0.2) | $ 0.1 | $ (0.4) | $ 0.3
Cash dividends declared per share on common stock (in dollars per share) | $ 0.41 | $ 0.37 | $ 1.23 | $ 1.11

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