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
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

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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