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v3.23.3

Accumulated Other Comprehensive Loss, Net (Tables) | 12 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive Loss | The following table summarizes the changes in accumulated other comprehensive loss for the years ended September 30, 2023, 2022, and 2021.
(in millions) |  | Foreign Currency Translation Adjustment |  | Pension Benefits Adjustment |  |  |  | Cash Flow Hedge |  | Accumulated Other Comprehensive Loss, net
Balances as of September 30, 2020 |  | $ | (36.0) |  |  | $ | (4.1) |  |  |  |  | $ | — |  |  | $ | (40.1) |
Other comprehensive income |  | 13.3 |  |  | 1.5 |  |  |  |  | — |  |  | 14.8 |
Amounts reclassified from AOCI, net of tax |  | — |  |  | 0.2 |  |  |  |  | — |  |  | 0.2 |
Other comprehensive income net of tax |  | 13.3 |  |  | 1.7 |  |  |  |  | — |  |  | 15.0 |
Balances as of September 30, 2021 |  | $ | (22.7) |  |  | $ | (2.4) |  |  |  |  | $ | — |  |  | $ | (25.1) |
Other comprehensive loss |  | (11.7) |  |  | (0.3) |  |  |  |  | (53.5) |  |  | (65.5) |
Other comprehensive loss net of tax |  | (11.7) |  |  | (0.3) |  |  |  |  | (53.5) |  |  | (65.5) |
Balances as of September 30, 2022 |  | $ | (34.4) |  |  | $ | (2.7) |  |  |  |  | $ | (53.5) |  |  | $ | (90.6) |
Other comprehensive income |  | 3.2 |  |  | 0.5 |  |  |  |  | 35.1 |  |  | 38.8 |
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) |

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