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Commitments and Contingencies - Warranty Claims (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]                
Standard Product Warranty Accrual $ 431.8 $ 361.5 $ 431.8 $ 361.5 $ 407.8 $ 376.3 $ 340.7 $ 310.2
Standard Product Warranty Accrual, Increase for Warranties Issued 49.1 41.8 131.6 111.5        
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties 5.8 1.7 13.1 5.4        
Standard Product Warranty Accrual, Decrease for Payments $ 30.9 $ 22.7 $ 89.2 $ 65.6