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Revenue Recognition - Schedule of Classification of Service-type Warranties in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Extended Product Warranty Accrual Balance Sheet Classification [Abstract]      
Service-type warranties, other current liabilities $ 21.8 $ 24.7  
Service-type warranties, other long-term liabilities 44.0 39.7  
Service-type warranties $ 65.8 $ 64.4 $ 68.2