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Revenue Recognition - Schedule of Changes in Warranty Liability and Unearned Extended Warranty Premiums (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation Of Revenue [Abstract]    
Balance at beginning of period $ 68.2 $ 30.7
Adoption of ASC 606   35.7
Deferred revenue for new service warranties 11.8 12.8
Amortization of deferred revenue (14.2) (12.5)
Changes in liability for pre-existing warranties, net   0.1
Foreign currency translation 0.1 (0.3)
Balance at end of period $ 65.9 $ 66.5