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Accumulated Other Comprehensive Loss, Net (Tables) | 12 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Loss | The following table summarizes the changes in accumulated other comprehensive loss for the years ended September 30, 2025, 2024, and 2023.
(in millions) |  | Foreign Currency Translation Adjustment |  | Pension Benefits Adjustment |  |  |  | Cash Flow Hedge |  | Accumulated Other Comprehensive Loss, net
Balances as of September 30, 2022 |  | $ | (34.4) |  |  | $ | (2.7) |  |  |  |  | $ | (53.5) |  |  | $ | (90.6) |
Other comprehensive income, net of tax |  | 3.2 |  |  | 0.5 |  |  |  |  | 35.1 |  |  | 38.8 |
Balances as of September 30, 2023 |  | $ | (31.2) |  |  | $ | (2.2) |  |  |  |  | $ | (18.4) |  |  | $ | (51.8) |
Other comprehensive income/(loss), net of tax |  | (0.1) |  |  | 1.0 |  |  |  |  | 25.7 |  |  | 26.6 |
Balances as of September 30, 2024 |  | $ | (31.3) |  |  | $ | (1.2) |  |  |  |  | $ | 7.3 |  |  | $ | (25.2) |
Other comprehensive income/(loss), net of tax |  | 9.9 |  |  | (0.1) |  |  |  |  | (0.6) |  |  | 9.2 |
Balances as of September 30, 2025 |  | $ | (21.4) |  |  | $ | (1.3) |  |  |  |  | $ | 6.7 |  |  | $ | (16.0) |

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