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SEGMENT INFORMATION - Net sales and long-lived assets by geographic area (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 3,551.3 $ 3,924.1 $ 4,925.0
Long-lived assets 723.1 862.3  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 3,209.5 3,554.6 4,507.0
Long-lived assets 644.4 753.3  
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 341.8 369.5 $ 418.0
Long-lived assets $ 78.7 $ 109.0