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Warranties - Schedule of Changes in Assurance-type Warranty Liability (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Product Warranties Disclosures [Abstract]    
Balance at beginning of year $ 65.1 $ 75.3
Adoption of ASC 606   (14.4)
Warranty provisions 43.1 55.5
Settlements made (55.9) (50.2)
Changes in liability for pre-existing warranties, net 14.8 (0.8)
Foreign currency translation 0.3 (0.3)
Balance at end of year $ 67.4 $ 65.1