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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]  
Financing Receivable, Current, Allowance for Credit Loss [Table Text Block]
The following table summarizes information concerning our allowance for credit losses:

202520242023
 (in millions)
Balance at beginning of year$8.3 $7.3 $5.6 
Provision charged to expense0.2 2.7 1.9 
Write-offs and other(4.9)(1.7)(0.2)
Balance at end of year$3.6 $8.3 $7.3 
Schedule of Reserves for Excess and Obsolete Inventory
The following table summarizes information concerning our inventory valuation reserves:

202520242023
 (in millions)
Balance at beginning of year$21.4 $16.8 $16.5 
Provision charged to expense11.9 13.3 3.8 
Inventory disposed(9.9)(8.7)(3.5)
Balance at end of year$23.4 $21.4 $16.8 
Schedule of Product Warranty Liability
Activity in our accrued warranty, reported within Other current liabilities and Other noncurrent liabilities, is presented below:
202520242023
 (in millions)
Balance at beginning of year$23.6 $15.7 $10.7 
Provision charged to expense14.9 13.0 14.8 
Warranty utilization(12.9)(5.1)(9.8)
Balance at end of year$25.6 $23.6 $15.7