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Accumulated Other Comprehensive Loss, Net (Tables) | 6 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive Loss | The following table summarizes the changes in accumulated other comprehensive loss, net for the six months ended March 31, 2021.
(in millions) |  | Foreign Currency Translation Adjustment |  | Pension Benefits Adjustment |  |  |  | Accumulated Other Comprehensive Loss, net
Balances as of September 30, 2020 |  | $ | (36.0) |  |  | $ | (4.1) |  |  |  |  | $ | (40.1) |
Other comprehensive income |  | 12.3 |  |  | — |  |  |  |  | 12.3 |
Balances as of March 31, 2021 |  | $ | (23.7) |  |  | $ | (4.1) |  |  |  |  | $ | (27.8) |

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