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GOODWILL (Tables) | 6 Months Ended
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Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table summarizes the changes in the carrying amount of goodwill by segment for the six months ended March 31, 2026:
(in millions) | Customized Polymer Solutions |  | Durable Metal Solutions |  | Sustainable Fiber Solutions |  | Innovative Closure Solutions |  | Total
Balance at September 30, 2025 | $ | 622.4 |  |  | $ | 418.7 |  |  | $ | 475.9 |  |  | $ | 179.5 |  |  | $ | 1,696.5 |
Segment recast | — |  |  | 31.3 |  |  | 52.4 |  |  | (83.7) |  |  | — |
Goodwill acquired | 2.7 |  |  | — |  |  | — |  |  | — |  |  | 2.7 |
Currency translation | (2.6) |  |  | (2.2) |  |  | — |  |  | (1.2) |  |  | (6.0) |
Balance at March 31, 2026 | $ | 622.5 |  |  | $ | 447.8 |  |  | $ | 528.3 |  |  | $ | 94.6 |  |  | $ | 1,693.2 |

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