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Accumulated Other Comprehensive Loss, Net | 12 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Accumulated Other Comprehensive Loss, Net | Accumulated Other Comprehensive Loss, Net Comprehensive income consists of net income and other gains and losses affecting stockholders’ equity that, under U.S. GAAP, are excluded from net income. Other comprehensive loss and income includes losses on cash flow hedges, net actuarial gains and losses from defined benefit pension plans, and gains and losses on foreign currency translations. 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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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