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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net Income (Loss) $ 166.9 $ 178.8 $ 110.2
Weighted average number of common shares 49,986,526 49,818,132 48,901,987
Dilutive effect of stock-based compensation 137,587 31,762 73,674
Adjusted weighted average number of common shares 50,124,113 49,849,894 48,975,661
Basic net income per common share $ 3.34 $ 3.59 $ 2.25
Diluted net income per common share $ 3.33 $ 3.59 $ 2.25