Supplemental Balance Sheet Information - Schedule of supplemental balance sheet information (Details) - USD ($) $ in Millions	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021
Balance Sheet Related Disclosures [Abstract]
Restricted Cash and Cash Equivalents	$ 1.2		$ 2.4
Allowance for doubtful accounts	28.3	$ 26.0
Warranty reserves	23.7	24.2
Accumulated depreciation on property, plant, and equipment	400.7	381.6
Inventories, net:
Raw materials and components	187.4	153.1
Work in process	113.1	104.0
Finished goods	180.7	154.5
Total inventories, net	$ 481.2	$ 411.6

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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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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