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SEGMENT INFORMATION - Net sales and long-lived assets by geographic area (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 3,552.7 $ 3,551.3 $ 3,924.1
Long-lived assets 704.4 723.1  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 3,247.8 3,209.5 3,554.6
Long-lived assets 630.5 644.4  
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 304.9 341.8 $ 369.5
Long-lived assets $ 73.9 $ 78.7