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Income Taxes - Schedule of Tax Attributes and Valuation Allowances (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Tax Benefit Amount |  |
Capital loss carryforwards | $ 15.4 | $ 14.4
State tax credit carryforward | 14.2 | 9.2
Net operating loss carryforwards | 69.6 | $ 60.8
Subtotal | 99.2 |
Other deferred tax assets | 29.3 |
Total | 128.5 |
Valuation Allowance |  |
Tax credit carryforward | 29.3 |
Subtotal | 68.2 |
Total | 97.5 |
Non-United States |  |
Tax Benefit Amount |  |
Net operating loss carryforward, subject to expiration | 10.7 |
Net operating loss carryforward, not subject to expiration | 51.8 |
Capital loss carryforwards | 15.4 |
State tax credit carryforward | 1.9 |
Valuation Allowance |  |
Net operating loss carryforward, subject to expiration | 2.1 |
Net operating loss carryforward, not subject to expiration | 47.9 |
Non-United States capital loss carryforward | 15.4 |
Tax credit carryforward | 0.0 |
United States |  |
Tax Benefit Amount |  |
State tax credit carryforward | 0.3 |
Valuation Allowance |  |
Tax credit carryforward | 0.0 |
State and Local |  |
Tax Benefit Amount |  |
State tax credit carryforward | 12.0 |
Net operating loss carryforwards | 7.1 |
Valuation Allowance |  |
Net operating loss carryforward, subject to expiration | 2.8 |
Tax credit carryforward | $ 0.0 |

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- Definition The carryforward amount of valuation allowances relating to net operating losses, capital losses, and tax credits, available to reduce taxable income under enacted tax laws. These amounts have been tax-affected. + References No definition available. + Details
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- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized, specific to carryforwards that are not subject to expiration. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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