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Warranties - Schedule of Changes in Assurance-type Warranty Liability (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Product Warranties Disclosures [Abstract]    
Balance at beginning of year $ 67.4 $ 65.1
Warranty provisions 50.1 43.1
Settlements made (65.0) (55.9)
Changes in liability for pre-existing warranties, net 16.2 14.8
Foreign currency translation   0.3
Acquisition 0.3  
Balance at end of year $ 69.0 $ 67.4