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Warranties -Schedule of Changes in Assurance-type Warranty Liability (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Product Warranties Disclosures [Abstract]    
Balance at beginning of period $ 69.0 $ 67.4
Warranty provisions 10.8 13.8
Settlements made (14.6) (14.2)
Changes in liability for pre-existing warranties, net 0.5 (2.6)
Foreign currency translation   0.2
Balance at end of period $ 65.7 $ 64.6