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Revenue Recognition - Schedule of Classification of Service-type Warranties in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Extended Product Warranty Accrual Balance Sheet Classification [Abstract]        
Service-type warranties, other current liabilities $ 23.7 $ 24.7    
Service-type warranties, other long-term liabilities 39.2 39.7    
Service-type warranties $ 62.9 $ 64.4 $ 65.9 $ 68.2