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Commitments and Contingencies - Warranty Liability (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Changes in warranty liability    
Warranty liability, beginning of year $ 376.3 $ 310.2
Warranties issued 185.8 154.5
Changes in liability for pre-existing warranties 15.1 3.8
Settlements made (122.9) (92.2)
Warranty liability, end of year $ 454.3 $ 376.3