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EARNINGS PER COMMON SHARE - Schedule of 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
Earnings Per Share [Abstract]      
Net income (loss) $ 145.2 $ (34.9) $ (380.1)
Basic net income (loss) per common share:      
Weighted-average Common Shares outstanding during the period (in shares) 57.6 56.8 56.0
Basic net income (loss) per common share (USD per share) $ 2.52 $ (0.61) $ (6.79)
Diluted net income (loss) per common share:      
Weighted-average Common Shares outstanding during the period (in shares) 57.6 56.8 56.0
Dilutive potential Common Shares (in shares) 1.1 0.0 0.0
Weighted-average number of Common Shares outstanding and dilutive potential Common Shares (in shares) 58.7 56.8 56.0
Diluted net income (loss) per common share (USD per share) $ 2.47 $ (0.61) $ (6.79)