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Accumulated Other Comprehensive Loss, Net (Tables) | 6 Months Ended
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Mar. 31, 2022
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, 2022.
(in millions) |  | Foreign Currency Translation Adjustment |  | Pension Benefits Adjustment |  | Cash Flow Hedge |  |  |  | Accumulated Other Comprehensive Loss, net
Balances as of September 30, 2021 |  | $ | (22.7) |  |  | $ | (2.4) |  |  | $ | — |  |  |  |  | $ | (25.1) |
Other comprehensive loss, net of tax |  | (1.3) |  |  | — |  |  | (0.1) |  |  |  |  | (1.4) |
Balances as of December 31, 2021 |  | (24.0) |  |  | (2.4) |  |  | (0.1) |  |  |  |  | (26.5) |
Other comprehensive income/(loss), net of tax |  | 1.2 |  |  | — |  |  | (18.1) |  |  |  |  | (16.9) |
Balances as of March 31, 2022 |  | $ | (22.8) |  |  | $ | (2.4) |  |  | $ | (18.2) |  |  |  |  | $ | (43.4) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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