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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) is as follows:
| Foreign currency translation, net of income tax |  | Pension actuarial amortization, net of income tax |  |  |  | Total
| (in millions)
Balance as of September 30, 2023 | $ | (20.2) |  |  | $ | (28.5) |  |  |  |  | $ | (48.7) |
Other comprehensive income | 9.1 |  |  | 8.8 |  |  |  |  | 17.9 |
Balance as of September 30, 2024 | (11.1) |  |  | (19.7) |  |  |  |  | (30.8) |
Other comprehensive income | 21.4 |  |  | 4.8 |  |  |  |  | 26.2 |
Balance as of September 30, 2025 | $ | 10.3 |  |  | $ | (14.9) |  |  |  |  | $ | (4.6) |

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