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Consolidated Statements of Operations - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Statement [Abstract]      
Net sales $ 3,413.1 $ 3,552.7 $ 3,551.3
Cost of sales 2,348.6 2,618.7 2,708.3
Cost of sales—impairment, restructuring and other 20.3 83.5 185.7
Gross margin 1,044.2 850.5 657.3
Operating expenses:      
Selling, general and administrative 603.4 559.0 551.3
Impairment, restructuring and other 63.4 62.8 280.5
Other (income) expense, net 18.8 19.9 (0.1)
Income (loss) from operations 358.6 208.8 (174.4)
Equity in loss of unconsolidated affiliates 2.8 68.1 101.1
Interest expense 128.8 158.8 178.1
Other non-operating (income) expense, net 5.3 5.5 (0.3)
Income (loss) before income taxes 221.7 (23.6) (453.3)
Income tax expense (benefit) 76.5 11.3 (73.2)
Net income (loss) $ 145.2 $ (34.9) $ (380.1)
Basic net income (loss) per common share      
Basic net income (loss) per common share (USD per share) $ 2.52 $ (0.61) $ (6.79)
Diluted net income (loss) per common share      
Diluted net income (loss) per common share (USD per share) $ 2.47 $ (0.61) $ (6.79)