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Revenue Recognition - Schedule of Classification of Service-type Warranties in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Extended Product Warranty Accrual Balance Sheet Classification [Abstract]        
Service-type warranties, other current liabilities $ 25.8 $ 27.8    
Service-type warranties, other long-term liabilities 38.9 40.4    
Service-type warranties $ 64.7 $ 68.2 $ 68.4 $ 30.7