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Commitments and Contingencies - Warranty Claims (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Movement in Standard Product Warranty Accrual [Roll Forward]                
Standard Product Warranty Accrual $ 474.7 $ 407.8 $ 474.7 $ 407.8 $ 464.0 $ 454.3 $ 390.0 $ 376.3
Standard Product Warranty Accrual, Increase for Warranties Issued 44.0 43.6 83.9 82.5        
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties (4.0) 3.0 (2.9) 7.3        
Standard Product Warranty Accrual, Decrease for Payments $ 29.3 $ 28.8 $ 60.6 $ 58.3