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Revenue (Tables) | 6 Months Ended
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Mar. 31, 2025
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | Ashland disaggregates its revenue by reportable segment and geographical region as Ashland believes these categories best depict how management reviews the financial performance of its operations. Ashland includes only U.S. and Canada in its North America designation and includes Europe, the Middle East and Africa in its Europe designation. See the following tables for details. See Note Q of the Notes to the Condensed Consolidated Financial Statements for additional information.
Sales by geography |  |  |  |  |  |  |
|  | Three months ended |  |  | Six months ended |
|  | March 31 |  |  | March 31 |
(In millions) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Life Sciences |  |  |  |  |  |  |
North America |  | $ | 30 |  |  | $ | 73 |  |  | $ | 53 |  |  | $ | 140 |
Europe |  |  | 69 |  |  |  | 72 |  |  |  | 119 |  |  |  | 136 |
Asia Pacific |  |  | 53 |  |  |  | 57 |  |  |  | 99 |  |  |  | 107 |
Latin America & other |  |  | 20 |  |  |  | 20 |  |  |  | 35 |  |  |  | 39 |
|  | $ | 172 |  |  | $ | 222 |  |  | $ | 306 |  |  | $ | 422 |
|  | Three months ended |  |  | Six months ended |
|  | March 31 |  |  | March 31 |
(In millions) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Personal Care |  |  |  |  |  |  |
North America |  | $ | 41 |  |  | $ | 45 |  |  | $ | 81 |  |  | $ | 85 |
Europe |  |  | 59 |  |  |  | 69 |  |  |  | 104 |  |  |  | 116 |
Asia Pacific |  |  | 30 |  |  |  | 31 |  |  |  | 60 |  |  |  | 57 |
Latin America & other |  |  | 16 |  |  |  | 24 |  |  |  | 34 |  |  |  | 40 |
|  | $ | 146 |  |  | $ | 169 |  |  | $ | 279 |  |  | $ | 298 |
|  | Three months ended |  |  | Six months ended |
|  | March 31 |  |  | March 31 |
(In millions) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Specialty Additives |  |  |  |  |  |  |
North America |  | $ | 46 |  |  | $ | 46 |  |  | $ | 86 |  |  | $ | 88 |
Europe |  |  | 48 |  |  |  | 63 |  |  |  | 82 |  |  |  | 103 |
Asia Pacific |  |  | 33 |  |  |  | 40 |  |  |  | 67 |  |  |  | 74 |
Latin America & other |  |  | 7 |  |  |  | 8 |  |  |  | 14 |  |  |  | 14 |
|  | $ | 134 |  |  | $ | 157 |  |  | $ | 249 |  |  | $ | 279 |
|  | Three months ended |  |  | Six months ended |
|  | March 31 |  |  | March 31 |
(In millions) |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Intermediates |  |  |  |  |  |  |
North America |  | $ | 25 |  |  | $ | 27 |  |  | $ | 48 |  |  | $ | 52 |
Europe |  |  | 6 |  |  |  | 6 |  |  |  | 11 |  |  |  | 10 |
Asia Pacific |  |  | 4 |  |  |  | 6 |  |  |  | 8 |  |  |  | 9 |
Latin America & other |  |  | 2 |  |  |  | 1 |  |  |  | 4 |  |  |  | 2 |
|  | $ | 37 |  |  | $ | 40 |  |  | $ | 71 |  |  | $ | 73 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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