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Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Dec. 31, 2025
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy	Recently issued accounting standards In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which expands disclosures in an entity’s income tax rate reconciliation table and regarding cash taxes paid both in the U.S. and foreign jurisdictions. ASU 2023-09 will be effective for annual periods beginning after December 15, 2024 (fiscal 2026). The Company is currently evaluating the impact of ASU 2023-09 on the Consolidated Financial Statements. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03), which requires, among other items, additional disaggregated disclosures in the notes to financial statements for certain categories of expenses that are included on the face of the Consolidated Statement of Operations. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026 (fiscal 2028), and for interim periods within fiscal years beginning after December 15, 2027 (fiscal 2029), with early adoption permitted. The Company is currently evaluating the impact of ASU 2024-03 on the Consolidated Financial Statements. No other new accounting pronouncements recently adopted or issued had or are expected to have a material impact on the Consolidated Financial Statements.
Revenue	Net revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring goods or providing services and is recognized when performance obligations are satisfied under the terms of contracts with customers.
Revenue Recognition, Deferred Revenue	Contract balances The balance in receivables from long-term manufacturing contracts at December 31, 2025 and September 30, 2025, was $274.7 and $278.8, respectively. The change was driven by the impact of net revenue recognized prior to billings to customers. The balance in the liabilities from long-term manufacturing contracts and advances at December 31, 2025 and September 30, 2025, was $238.9 and $241.9, respectively, and consists primarily of cash payments received or due in advance of satisfying performance obligations. The net revenue recognized for the three months ended December 31, 2025 and 2024, related to liabilities from long-term manufacturing contracts and advances as of September 30, 2025 and 2024, was $76.0 and $95.6, respectively. During the three months ended December 31, 2025 and 2024, the adjustments related to performance obligations satisfied in previous periods were immaterial.

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Disclosure of accounting policy for long-duration insurance products (whole life, universal life, variable annuities, guaranteed renewable term, and title insurance contracts), including the basis for recognizing and determining amounts of revenues and policyholder funds pertaining to long-duration contracts, the general nature of and basis of presentation for separate accounts of contract holders, the practices and methods of allocating fees to policyholders' and contract holders' accounts, the nature, terms, valuation methods and assumptions used to determine fair value of minimum guarantees provided to policy and contract holders, and the methods used for capitalizing and amortizing sales inducements and policy acquisition costs. Disclosure may also include the classification of cash receipts and cash disbursements in statement of cash flows.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480081/944-40-50-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-SubTopic 80
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480109/944-80-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-SubTopic 80
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480109/944-80-50-1

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- Definition

Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.

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Disclosure of accounting policy for revenue. Includes revenue from contract with customer and from other sources.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

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