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Revenue Recognition - Rollforward of Allowance for Product Returns (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Allowance For Product Returns [Roll Forward]      
Beginning Balance $ 19.2 $ 20.9 $ 20.3
Charged to Profit & Loss 36.9 33.4 30.3
Deductions (33.3) (34.4) (31.8)
Other Adjustments 0.3 (0.7) 2.1
Ending Balance $ 23.1 $ 19.2 $ 20.9