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Warranties -Schedule of Changes in Assurance-type Warranty Liability (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Product Warranties Disclosures [Abstract]    
Balance at beginning of period $ 67.4 $ 65.1
Warranty provisions 35.7 29.3
Settlements made (48.5) (40.1)
Changes in liability for pre-existing warranties, net 14.9 12.1
Foreign currency translation 0.1 0.1
Acquisition 0.3  
Balance at end of period $ 69.9 $ 66.5