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Supplemental Balance Sheet Information - Schedule of supplemental balance sheet information (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
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Balance Sheet Related Disclosures [Abstract] |  |  |  |
Allowance for credit losses | $ 11.8 | $ 11.3 |  |
Warranty reserves | 43.1 | 46.0 |  |
Accumulated depreciation on property, plant, and equipment | 251.8 | 245.0 |  |
Inventories, net: |  |  |  |
Raw materials and components | 165.8 | 164.7 |  |
Work in process | 86.4 | 81.9 |  |
Finished goods | 97.2 | 97.4 |  |
Total inventories, net | 349.4 | 344.0 |  |
Cash and cash equivalents | 173.1 | 164.8 | $ 208.0 |
Short-term restricted cash included in other current assets | 6.5 |  | 6.9 |
Long-term restricted cash included in other long-term assets | 18.7 |  | 23.6 |
Total cash and cash equivalents and restricted cash shown in the Consolidated Statements of Cash Flows | $ 198.3 | $ 191.4 | $ 238.5 | $ 227.9

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