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Revenue from Contracts with Customers - Components of Trade Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable, Unclassified [Abstract]
Billed receivables	$ 210.8	$ 212.7
Unbilled receivables	4.7	4.5
Gross customer receivables	215.5	217.2
Allowance for credit losses	(3.6)	(8.3)
Receivables, net	211.9	208.9
Deferred revenue	$ 12.1	$ 12.8	$ 9.2

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of allowance for credit loss on accounts receivable, classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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