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Supplemental Balance Sheet Information (Schedule Of Selected Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | $ 216.7 | $ 160.3 | $ 125.6 | $ 146.5
Inventories: |  |  |  |
Purchased components and raw material | 169.0 | 176.9 |  |
Work in process | 66.5 | 60.0 |  |
Finished goods | 75.8 | 61.0 |  |
Inventories, net | 311.3 | 297.9 |  |
Prepaid Expense and Other Assets, Current [Abstract] |  |  |  |
Prepaid Expense | 18.4 | 17.8 |  |
Nontrade Receivables | 2.4 | 1.7 |  |
Maintenance and repair tooling | 4.4 | 4.1 |  |
Income taxes | 0.8 | 0.8 |  |
Nontrade Receivables, Current | 1.8 | 2.2 |  |
Other | 5.7 | 4.9 |  |
Other | 33.5 | 31.5 |  |
Property, plant and equipment: |  |  |  |
Land | 6.5 | 6.4 |  |
Buildings | 118.0 | 117.2 |  |
Machinery and equipment | 528.2 | 525.8 |  |
Construction in progress | 40.5 | 36.9 |  |
Property, plant and equipment, gross | 693.2 | 686.3 |  |
Accumulated depreciation | (384.8) | (374.6) |  |
Property, plant and equipment net | 308.4 | 311.7 |  |
Other Assets, Noncurrent [Abstract] |  |  |  |
Operating lease, Right-of-Use asset | 29.9 | 23.6 |  |
us-Maintenance, repair and tooling supplies | 21.8 | 21.1 |  |
Nontrade Receivables, Noncurrent | 2.4 | 2.4 |  |
Assets for Plan Benefits, Defined Benefit Plan | 6.2 | 6.6 |  |
Other Receivables | 1.8 | 1.8 |  |
Debt Issuance Costs, Noncurrent, Net | 0.6 | 0.7 |  |
Other Assets, Miscellaneous, Noncurrent | 0.7 | 2.6 |  |
Other noncurrent assets | $ 63.4 | $ 58.8 |  |

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Balance Type: | debit
Period Type: | instant