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Commitments and Contingencies - Warranty Liability (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Changes in warranty liability    
Warranty liability, beginning of year $ 143.7 $ 104.4
Warranties issued 81.6 69.7
Changes in liability for pre-existing warranties 49.3 30.0
Settlements made (72.6) (60.4)
Warranty liability, end of year $ 202.0 $ 143.7