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Earnings per Share - Computation of Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net Income $ 45.5 $ 14.7 $ 69.0 $ 63.7
Basic weighted average number of shares outstanding (in shares) 58,490 57,768 58,239 57,641
Stock awards and equity units (share equivalent) (in shares) 5 74 482 502
Diluted weighted average shares outstanding (in shares) 58,495 57,842 58,721 58,143
Earnings per common share - Basic (in dollars per share) $ 0.78 $ 0.25 $ 1.18 $ 1.11
Earnings per common share - Diluted (in dollars per share) $ 0.78 $ 0.25 $ 1.18 $ 1.10
Antidilutive shares (in shares) 4,300 4,300 2,500 2,800