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Supplemental Balance Sheet Information (Tables)
 6 Months Ended
Mar. 31, 2025
Balance Sheet Related Disclosures [Abstract]  
Schedule Of Selected Supplemental Balance Sheet Information [Table Text Block]
Selected supplemental asset information is presented below:
 March 31,September 30,
 20252024
 (in millions)
Inventories, net:
Purchased components and raw materials$164.3 $163.6 
Work in process, net67.0 65.8 
Finished goods, net74.2 72.3 
Inventories, net$305.5 $301.7 
Other current assets:
Prepaid expenses$20.5 $17.2 
Non-trade receivables3.1 3.4 
Maintenance and repair supplies and tooling3.8 5.4 
Goods to be returned3.2 4.2 
Income taxes0.8 0.8 
Workers' compensation reimbursement receivable2.4 2.4 
Other current assets6.9 4.5 
Total other current assets$40.7 $37.9 
Property, plant and equipment:
Land$6.5 $6.5 
Buildings130.1 126.6 
Machinery and equipment562.7 550.4 
Construction in progress52.1 45.2 
Total property, plant and equipment751.4 728.7 
Accumulated depreciation(426.6)(409.9)
Property, plant and equipment, net$324.8 $318.8 
Other noncurrent assets:
Operating lease right-of-use assets$26.6 $26.9 
Maintenance and repair supplies and tooling19.2 20.3 
Workers' compensation reimbursement receivable4.1 4.1 
Pension asset14.4 13.5 
Note receivable 1.8 1.8 
Deferred financing fees1.1 1.3 
Other noncurrent assets0.4 0.4 
Total other noncurrent assets$67.6 $68.3 
Schedule of Accrued Liabilities
Selected supplemental liability information is presented below:
 March 31,September 30,
 20252024
 (in millions)
Other current liabilities:
Compensation and benefits$34.0 $58.3 
Customer rebates21.7 16.9 
Income taxes payable5.1 5.6 
Warranty accrual12.3 13.3 
Deferred revenue6.9 7.1 
Returned goods accrual5.0 7.3 
Taxes other than income taxes4.2 3.5 
Operating lease liabilities5.9 5.5 
Workers' compensation accrual4.4 4.6 
Restructuring liabilities2.1 3.4 
Interest payable5.3 5.3 
Other current liabilities9.3 16.5 
Total other current liabilities$116.2 $147.3 
Other noncurrent liabilities:
Operating lease liabilities$21.9 $22.5 
Warranty accrual8.6 10.3 
Transition tax liability— 1.7 
Uncertain tax position liability3.6 3.0 
NMTC liability3.9 3.9 
Workers' compensation accrual5.8 5.8 
Asset retirement obligation4.2 4.2 
Deferred revenue5.5 5.7 
Deferred development grant2.1 2.5 
Other noncurrent liabilities3.2 4.1 
Total other noncurrent liabilities$58.8 $63.7 
Schedule of Goodwill
The following table summarizes information concerning our goodwill, all of which is within our Water Management Solutions segment, during the six months ended March 31, 2025, in millions:

Balance at September 30, 2024:
Goodwill$821.1 
Accumulated impairment(740.4)
Goodwill, net80.7 
Activity during the six months ended March 31, 2025:
Change in foreign currency exchange rates0.2 
Balance at March 31, 2025
$80.9