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Warranties -Schedule of Changes in Assurance-type Warranty Liability (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Product Warranties Disclosures [Abstract]    
Balance at beginning of period $ 65.1 $ 75.3
Adoption of ASC 606   (14.3)
Warranty provisions 21.0 21.2
Settlements made (26.1) (22.8)
Changes in liability for pre-existing warranties, net 5.2 (0.3)
Foreign currency translation   (0.2)
Balance at end of period $ 65.2 $ 58.9