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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]      
Net income (loss) $ (34.9) $ (380.1) $ (437.5)
Basic net loss per common share:      
Weighted-average Common Shares outstanding during the period (in shares) 56.8 56.0 55.5
Basic net income (loss) per common share (USD per share) $ (0.61) $ (6.79) $ (7.88)
Diluted net loss per common share:      
Weighted-average Common Shares outstanding during the period (in shares) 56.8 56.0 55.5
Dilutive potential Common Shares (in shares) 0.0 0.0 0.0
Weighted-average number of Common Shares outstanding and dilutive potential Common Shares (in shares) 56.8 56.0 55.5
Diluted net income (loss) per common share (USD per share) $ (0.61) $ (6.79) $ (7.88)