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Commitments and Contingencies - Warranty Claims (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Movement in Standard Product Warranty Accrual [Roll Forward]                
Standard Product Warranty Accrual $ 557.3 $ 544.6 $ 557.3 $ 544.6 $ 570.4 $ 566.9 $ 531.8 $ 512.4
Standard Product Warranty Accrual, Increase for Warranties Issued 43.0 53.3 87.0 98.4        
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties (27.0) (12.0) (38.0) (7.5)        
Standard Product Warranty Accrual, Decrease for Payments $ 29.1 $ 28.5 $ 58.6 $ 58.7