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RESTRUCTURING CHARGES - Amounts Expected to be Incurred, Amounts Incurred, and Amounts Remaining to Be Incurred (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | $ 44.6 |  | $ 44.6 |
Amounts Incurred During the Six Months Ended March 31, 2026 | 10.8 | $ 9.1 | 19.0 | $ 12.4
Amounts Remaining to be Incurred | 25.6 |  | 25.6 |
Employee separation costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Amounts Incurred During the Six Months Ended March 31, 2026 | 7.8 |  | 12.3 |
Other restructuring costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Amounts Incurred During the Six Months Ended March 31, 2026 | 3.0 |  | 6.7 |
Customized Polymer Solutions |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 3.3 |  | 3.3 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 2.8 |
Amounts Remaining to be Incurred | 0.5 |  | 0.5 |
Customized Polymer Solutions | Employee separation costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 2.5 |  | 2.5 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 2.0 |
Amounts Remaining to be Incurred | 0.5 |  | 0.5 |
Customized Polymer Solutions | Other restructuring costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 0.8 |  | 0.8 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 0.8 |
Amounts Remaining to be Incurred | 0.0 |  | 0.0 |
Durable Metal Solutions |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 12.8 |  | 12.8 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 5.1 |
Amounts Remaining to be Incurred | 7.7 |  | 7.7 |
Durable Metal Solutions | Employee separation costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 5.5 |  | 5.5 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 3.5 |
Amounts Remaining to be Incurred | 2.0 |  | 2.0 |
Durable Metal Solutions | Other restructuring costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 7.3 |  | 7.3 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 1.6 |
Amounts Remaining to be Incurred | 5.7 |  | 5.7 |
Sustainable Fiber Solutions |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 28.1 |  | 28.1 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 11.0 |
Amounts Remaining to be Incurred | 17.1 |  | 17.1 |
Sustainable Fiber Solutions | Employee separation costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 8.2 |  | 8.2 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 6.7 |
Amounts Remaining to be Incurred | 1.5 |  | 1.5 |
Sustainable Fiber Solutions | Other restructuring costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 19.9 |  | 19.9 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 4.3 |
Amounts Remaining to be Incurred | 15.6 |  | 15.6 |
Innovative Closure Solutions |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 0.4 |  | 0.4 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 0.1 |
Amounts Remaining to be Incurred | 0.3 |  | 0.3 |
Innovative Closure Solutions | Employee separation costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 0.4 |  | 0.4 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 0.1 |
Amounts Remaining to be Incurred | 0.3 |  | 0.3 |
Innovative Closure Solutions | Other restructuring costs |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |
Total Amounts Expected to be Incurred | 0.0 |  | 0.0 |
Amounts Incurred During the Six Months Ended March 31, 2026 |  |  | 0.0 |
Amounts Remaining to be Incurred | $ 0.0 |  | $ 0.0 |

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