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Commitments and Contingencies - Warranty Claims (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Movement in Standard Product Warranty Accrual [Roll Forward]        
Standard Product Warranty Accrual $ 531.8 $ 464.0 $ 512.4 $ 454.3
Standard Product Warranty Accrual, Increase for Warranties Issued 45.1 39.9    
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties 4.5 1.1    
Standard Product Warranty Accrual, Decrease for Payments $ 30.2 $ 31.3