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Accumulated Other Comprehensive Loss, Net | 12 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Accumulated Other Comprehensive Loss, Net | Accumulated Other Comprehensive Loss, Net Accumulated other comprehensive loss, net includes net actuarial losses from defined benefit pension plans, foreign currency translation adjustments, and cash flow hedge gains or losses. The following table summarizes the changes in accumulated other comprehensive loss for the years ended September 30, 2025, 2024, and 2023.
(in millions) |  | Foreign Currency Translation Adjustment |  | Pension Benefits Adjustment |  |  |  | Cash Flow Hedge |  | Accumulated Other Comprehensive Loss, net
Balances as of September 30, 2022 |  | $ | (34.4) |  |  | $ | (2.7) |  |  |  |  | $ | (53.5) |  |  | $ | (90.6) |
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) |
Other comprehensive income/(loss), net of tax |  | (0.1) |  |  | 1.0 |  |  |  |  | 25.7 |  |  | 26.6 |
Balances as of September 30, 2024 |  | $ | (31.3) |  |  | $ | (1.2) |  |  |  |  | $ | 7.3 |  |  | $ | (25.2) |
Other comprehensive income/(loss), net of tax |  | 9.9 |  |  | (0.1) |  |  |  |  | (0.6) |  |  | 9.2 |
Balances as of September 30, 2025 |  | $ | (21.4) |  |  | $ | (1.3) |  |  |  |  | $ | 6.7 |  |  | $ | (16.0) |

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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/1943274/2147477250/944-220-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/1943274/2147478524/942-220-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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