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Accumulated Other Comprehensive Loss, Net (Tables) | 12 Months Ended
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Sep. 30, 2021
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, 2021, 2020, and 2019.
(in millions) |  | Foreign Currency Translation Adjustment |  | Pension Benefits Adjustment |  |  |  | Accumulated Other Comprehensive Loss, net
Balances as of September 30, 2018 |  | $ | (30.5) |  |  | $ | (2.6) |  |  |  |  | $ | (33.1) |
Other comprehensive loss |  | (0.8) |  |  | (0.8) |  |  |  |  | (1.6) |
Amounts reclassified from AOCI, net of tax |  | (0.2) |  |  | 0.1 |  |  |  |  | (0.1) |
Other comprehensive loss |  | (1.0) |  |  | (0.7) |  |  |  |  | (1.7) |
Balances as of September 30, 2019 |  | $ | (31.5) |  |  | $ | (3.3) |  |  |  |  | $ | (34.8) |
ASU 2018-02 cumulative transition adjustment |  | — |  |  | (0.7) |  |  |  |  | (0.7) |
Adjusted balances as of September 30, 2019 |  | (31.5) |  |  | (4.0) |  |  |  |  | (35.5) |
Other comprehensive loss |  | (4.5) |  |  | (0.2) |  |  |  |  | (4.7) |
Amounts reclassified from AOCI, net of tax |  | — |  |  | 0.1 |  |  |  |  | 0.1 |
Other comprehensive loss |  | (4.5) |  |  | (0.1) |  |  |  |  | (4.6) |
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 |  | 13.3 |  |  | 1.7 |  |  |  |  | 15.0 |
Balances as of September 30, 2021 |  | $ | (22.7) |  |  | $ | (2.4) |  |  |  |  | $ | (25.1) |

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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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