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Reclassifications out of Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Balances and Reporting Period Activities Related to Reclassifications Out of Accumulated Other Comprehensive Loss | The accumulated balances and reporting period activities for the years ended September 30, 2025, 2024 and 2023 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions):
| Pension Related Adjustments |  | Foreign Currency Translation Adjustments |  | Loss on Derivative Instruments |  | Accumulated Other Comprehensive Loss
Balances at September 30, 2022 | $ | (217.3) |  |  | $ | (799.3) |  |  | $ | 36.9 |  |  | $ | (979.7) |
Other comprehensive income (loss) before reclassification | (10.9) |  |  | 59.6 |  |  | 10.7 |  |  | 59.4 |
Amounts reclassified from accumulated other comprehensive loss | 2.2 |  |  | — |  |  | (8.5) |  |  | (6.3) |
Balances at September 30, 2023 | $ | (226.0) |  |  | $ | (739.7) |  |  | $ | 39.1 |  |  | $ | (926.6) |
| Pension Related Adjustments |  | Foreign Currency Translation Adjustments |  | Loss on Derivative Instruments |  | Accumulated Other Comprehensive Loss
Balances at September 30, 2023 | $ | (226.0) |  |  | $ | (739.7) |  |  | $ | 39.1 |  |  | $ | (926.6) |
Other comprehensive (loss) income before reclassification | (26.6) |  |  | 93.2 |  |  | (10.6) |  |  | 56.0 |
Amounts reclassified from accumulated other comprehensive loss | 0.6 |  |  | — |  |  | (12.7) |  |  | (12.1) |
Balances at September 30, 2024 | $ | (252.0) |  |  | $ | (646.5) |  |  | $ | 15.8 |  |  | $ | (882.7) |
| Pension Related Adjustments |  | Foreign Currency Translation Adjustments |  | Loss on Derivative Instruments |  | Accumulated Other Comprehensive Loss
Balances at September 30, 2024 | $ | (252.0) |  |  | $ | (646.5) |  |  | $ | 15.8 |  |  | $ | (882.7) |
Other comprehensive (loss) income before reclassification | (1.3) |  |  | (5.9) |  |  | 4.8 |  |  | (2.4) |
Amounts reclassified from accumulated other comprehensive loss | 1.9 |  |  | — |  |  | (9.8) |  |  | (7.9) |
Balances at September 30, 2025 | $ | (251.4) |  |  | $ | (652.4) |  |  | $ | 10.8 |  |  | $ | (893.0) |

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