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Supplemental Balance Sheet Information (Tables)
3 Months Ended
Mar. 31, 2022
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,
 20222021
 (in millions)
Inventories:
Purchased components and raw material$137.4 $100.9 
Work in process, net46.4 41.6 
Finished goods, net45.4 42.2 
Total inventories$229.2 $184.7 
Other current assets:
Prepaid expenses$13.1 $12.8 
Non-trade receivables10.7 10.7 
Maintenance and repair supplies and tooling2.3 2.9 
Income taxes0.2 0.2 
Workers’compensation reimbursement receivable1.7 0.8 
Other current assets3.6 1.9 
Total other current assets$31.6 $29.3 
Property, plant and equipment:
Land$5.5 $6.1 
Buildings86.7 84.6 
Machinery and equipment446.1 433.3 
Construction in progress93.0 83.7 
Total property, plant and equipment631.3 607.7 
Accumulated depreciation(339.0)(324.3)
Property, plant and equipment, net$292.3 $283.4 
Other noncurrent assets:
Operating lease right-of-use assets$25.7 $27.1 
Maintenance and repair supplies and tooling20.5 19.3 
Workers’ compensation reimbursement receivable5.0 2.7 
Pension asset19.0 16.8 
Note receivable1.8 1.8 
Deferred financing fees1.1 1.3 
Other noncurrent assets3.8 4.3 
Total other noncurrent assets$76.9 $73.3 
Schedule of Accrued Liabilities Selected supplemental liability information is presented below.
 March 31,September 30,
 20222021
 (in millions)
Other current liabilities:
Compensation and benefits$32.4 $44.6 
Customer rebates7.7 19.6 
Warranty accrual5.9 6.7 
Deferred revenue7.6 5.4 
Refund liability5.2 6.0 
Taxes other than income taxes5.5 4.4 
Operating lease liabilities3.8 4.0 
Workers’ compensation accrual3.1 2.6 
CARES Act payroll tax liabilities3.6 3.6 
Restructuring liabilities2.1 3.1 
Environmental liabilities1.2 1.2 
Interest payable5.3 6.2 
Income taxes payable1.7 8.5 
Other current liabilities7.4 11.2 
Total other current liabilities$92.5 $127.1 
Other noncurrent liabilities:
Operating lease liabilities$23.0 $24.6 
Warranty accrual1.7 3.0 
Transition tax liability4.1 4.7 
Uncertain tax position liability4.7 4.8 
NMTC liability3.9 3.9 
Workers’ compensation accrual10.6 7.9 
Asset retirement obligation 3.6 3.6 
CARES Act payroll tax liabilities— 3.6 
Deferred development grant2.5 2.5 
Other noncurrent liabilities3.0 3.4 
Total other noncurrent liabilities$57.1 $62.0 
Schedule of Goodwill The following table summarizes information concerning our goodwill balance in the six months ended March 31, 2022, in millions.
Balance at September 30, 2021$115.1 
Acquisition adjustments0.1 
Effects of changes in foreign currency exchange rates0.6 
Balance at March 31, 2022$115.8