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Income Taxes - Components of Income Before Income Taxes and Reconciliation of Statutory Federal Income Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 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 | 21.00% | 21.00% | 21.00%
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 | 0.0 | 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 | 0.0 | (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) | 0.0 | 5.4
Other | (0.8) | 1.1 | 0.2
Income tax expense | $ 77.5 | $ 69.1 | $ 37.1
Effective tax rate | 26.50% | 24.40% | 15.70%

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