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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense | Income tax expense consisted of the following for the years ended September 30:
(In millions) |  | 2025 |  | 2024 |  | 2023
Current |  |  |  |  |  |
Federal |  | $ | 24.5 |  |  | $ | 34.7 |  |  | $ | 8.0 |
State |  | 11.7 |  |  | 8.3 |  |  | (5.5) |
Non-U.S. |  | 3.0 |  |  | 2.6 |  |  | 1.0 |
|  | 39.2 |  |  | 45.6 |  |  | 3.5 |
Deferred |  |  |  |  |  |
Federal |  | 31.5 |  |  | 20.8 |  |  | 36.8 |
State |  | 5.8 |  |  | 2.7 |  |  | (3.2) |
Non-U.S. |  | 1.0 |  |  | — |  |  | — |
|  | 38.3 |  |  | 23.5 |  |  | 33.6 |
Income tax expense |  | $ | 77.5 |  |  | $ | 69.1 |  |  | $ | 37.1 |
Schedule and Reconciliation of the Statutory Federal Income Tax | The following presents pre-tax income and the principal components of the reconciliation between the effective tax rate and the U.S. federal statutory income tax rate in effect for the years ended September 30:
(In millions) |  | 2025 |  | 2024 |  | 2023
Income before income taxes |  |  |  |  |  |
United States |  | $ | 281.4 |  |  | $ | 286.5 |  |  | $ | 242.7 |
Non-U.S. |  | 10.9 |  |  | (2.9) |  |  | (6.2) |
Total income before income taxes |  | $ | 292.3 |  |  | $ | 283.6 |  |  | $ | 236.5 |
U.S. statutory tax rate |  | 21 | % |  | 21 | % |  | 21 | %
Income taxes computed at U.S. statutory tax rate |  | $ | 61.4 |  |  | $ | 59.6 |  |  | $ | 49.7 |
(Decrease) increase in amount computed resulting from: |  |  |  |  |  |
Unrecognized tax benefits |  | — |  |  | 0.1 |  |  | 0.1 |
State taxes, net of federal benefit |  | 15.0 |  |  | 9.2 |  |  | 11.2 |
International rate differential |  | 0.7 |  |  | (0.1) |  |  | 0.1 |
Permanent items |  | 1.3 |  |  | 1.7 |  |  | 0.1 |
Remeasurement of net deferred taxes |  | — |  |  | (0.1) |  |  | (1.1) |
Return-to-provision adjustments |  | (0.1) |  |  | (0.7) |  |  | (0.9) |
Change in valuation allowances |  | 0.1 |  |  | (1.7) |  |  | (27.7) |
Tax Matters Agreement activity |  | (0.1) |  |  | — |  |  | 5.4 |
Other |  | (0.8) |  |  | 1.1 |  |  | 0.2 |
Income tax expense |  | $ | 77.5 |  |  | $ | 69.1 |  |  | $ | 37.1 |
Effective tax rate |  | 26.5 | % |  | 24.4 | % |  | 15.7 | %
Schedule of Deferred Tax Assets and Liabilities | A summary of the deferred tax assets and liabilities included in the Consolidated Balance Sheets follows as of September 30:
(In millions) |  | 2025 |  | 2024
Deferred tax assets |  |  |  |
U.S. net operating loss carryforwards |  | $ | 3.2 |  |  | $ | — |
Non-U.S. net operating loss carryforwards (a) |  | 0.5 |  |  | 2.9 |
State net operating loss carryforwards (b) |  | 5.7 |  |  | 6.9 |
Employee benefit obligations |  | 37.6 |  |  | 33.9 |
Compensation accruals |  | 16.6 |  |  | 15.8 |
Credit carryforwards (c) |  | — |  |  | 0.3 |
Operating lease liabilities |  | 123.3 |  |  | 107.9 |
Other |  | 14.5 |  |  | 10.3 |
Valuation allowances (d) |  | (4.8) |  |  | (1.0) |
Net deferred tax assets |  | 196.6 |  |  | 177.0 |
Deferred tax liabilities |  |  |  |
Goodwill and other intangibles |  | 33.6 |  |  | 25.9 |
Property, plant and equipment |  | 196.0 |  |  | 154.1 |
Operating lease assets |  | 84.0 |  |  | 75.4 |
Other |  | — |  |  | 0.2 |
Total deferred tax liabilities |  | 313.6 |  |  | 255.6 |
Total net deferred tax liabilities (e) |  | $ | (117.0) |  |  | $ | (78.6) |
(a)Gross non-U.S. net operating loss carryforwards of $1.7 million expire in fiscal years 2043 to 2044. (b)Apportioned gross state net operating loss carryforwards of $108.1 million expire in fiscal year s 2029 to 2045. (c)Credit carryforwards consist primarily of state tax credits that generally expire in fiscal years 2025 through 2032. (d)Valuation allowances at September 30, 2025 primarily relate t o nondeductible executive compensation and net operating loss carryforwards that are not expected to be realized or realizable. (e)Balances are presented in the Consolidated Balance Sheets based on the net position of each tax jurisdiction.
Schedule of Gross Unrecognized Tax Benefits | The aggregate changes in the balance of gross unrecognized tax benefits were as follows for the years ended September 30:
(In millions) |  | 2025 |  | 2024 |  | 2023
Gross unrecognized tax benefits as of October 1 |  | $ | 33.1 |  |  | $ | 35.7 |  |  | $ | 8.2 |
Increases related to tax positions from prior years |  | — |  |  | 0.1 |  |  | 0.6 |
Decreases related to tax positions from prior years |  | — |  |  | (2.1) |  |  | (0.6) |
Increases related to tax positions taken during the current year |  | — |  |  | — |  |  | 27.7 |
Lapses of statutes of limitation |  | (0.3) |  |  | (0.6) |  |  | (0.2) |
Gross unrecognized tax benefits as of September 30 (a) |  | $ | 32.8 |  |  | $ | 33.1 |  |  | $ | 35.7 |
(a)These unrecognized tax benefits would favorably impact the effective income tax rate, primarily for discontinued operations, if recognized. Accruals for interest and penalties were $6.5 million and $1.8 million as of September 30, 2025 and 2024, respectively.

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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