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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Numerator      
Income from continuing operations $ 214.8 $ 214.5 $ 199.4
(Loss) income from discontinued operations, net of tax (4.1) (3.0) 1,220.3
Net income $ 210.7 $ 211.5 $ 1,419.7
Denominator      
Weighted-average shares common shares outstanding (in shares) 127.9 130.1 161.6
Effect of potentially dilutive securities (in shares) 0.7 0.9 1.0
Weighted-average diluted shares outstanding (in shares) 128.6 131.0 162.6
Basic earnings per share      
Continuing operations, basic earnings per share (usd per share) $ 1.68 $ 1.65 $ 1.24
Discontinued operations, basic earnings per share (usd per share) (0.03) (0.02) 7.55
Basic earnings per share (usd per share) 1.65 1.63 8.79
Diluted earnings per share      
Continuing operations, diluted earnings per share (usd per share) 1.67 1.63 1.23
Discontinued operations, diluted earnings per share (usd per share) (0.03) (0.02) 7.50
Diluted earnings per share (usd per share) $ 1.64 $ 1.61 $ 8.73
Antidilutive securities excluded from computation of earnings per share, amount 0.1 0.1 0.2