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SEGMENT INFORMATION - Net sales and long-lived assets by geographic area (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 4,925.0 $ 4,131.6 $ 3,156.0
Long-lived assets 1,007.9 915.3  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 4,507.0 3,773.4 2,851.9
Long-lived assets 868.8 773.5  
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 418.0 358.2 $ 304.1
Long-lived assets $ 139.1 $ 141.8