v3.25.2
Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                
Net income $ 32.9 $ 31.6 $ 16.5 $ 38.7 $ 45.0 $ 38.2 $ 81.0 $ 121.8
Weighted average number of common shares 50,931,777     50,755,276     50,849,223 50,322,916
Dilutive effect of stock-based compensation 73,353     299,777     196,702 391,782
Adjusted weighted average number of common shares 51,005,130     51,055,053     51,045,925 50,714,698
Basic net income per common share $ 0.65     $ 0.76     $ 1.59 $ 2.42
Diluted net income per common share $ 0.65     $ 0.76     $ 1.59 $ 2.40
Retained Earnings                
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                
Net income $ 32.9 $ 31.6 $ 16.5 $ 38.7 $ 45.0 $ 38.2