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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
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