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BUSINESS SEGMENT INFORMATION - Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Depreciation, depletion and amortization expense: |  |  |  |
Total depreciation, depletion and amortization expense |  |  | $ 117.5 | $ 133.9
Continuing Operations |  |  |  |
Depreciation, depletion and amortization expense: |  |  |  |
Total depreciation, depletion and amortization expense | $ 57.2 | $ 57.1 | 117.5 | 115.6
Capital Expenditure [Abstract] |  |  |  |
Total capital expenditures | 37.2 | 40.3 | 72.4 | 71.0
Continuing Operations | Operating Segments |  |  |  |
Capital Expenditure [Abstract] |  |  |  |
Total capital expenditures | 33.4 | 38.7 | 65.4 | 67.3
Continuing Operations | Corporate and other |  |  |  |
Capital Expenditure [Abstract] |  |  |  |
Total capital expenditures | 3.8 | 1.6 | 7.0 | 3.7
Customized Polymer Solutions | Continuing Operations |  |  |  |
Depreciation, depletion and amortization expense: |  |  |  |
Total depreciation, depletion and amortization expense | 25.0 | 22.9 | 52.9 | 45.9
Customized Polymer Solutions | Continuing Operations | Operating Segments |  |  |  |
Capital Expenditure [Abstract] |  |  |  |
Total capital expenditures | 16.7 | 7.0 | 27.9 | 16.9
Durable Metal Solutions | Continuing Operations |  |  |  |
Depreciation, depletion and amortization expense: |  |  |  |
Total depreciation, depletion and amortization expense | 7.6 | 7.0 | 15.2 | 14.2
Durable Metal Solutions | Continuing Operations | Operating Segments |  |  |  |
Capital Expenditure [Abstract] |  |  |  |
Total capital expenditures | 6.3 | 7.4 | 13.2 | 14.2
Sustainable Fiber Solutions | Continuing Operations |  |  |  |
Depreciation, depletion and amortization expense: |  |  |  |
Total depreciation, depletion and amortization expense | 23.3 | 25.7 | 46.7 | 52.3
Sustainable Fiber Solutions | Continuing Operations | Operating Segments |  |  |  |
Capital Expenditure [Abstract] |  |  |  |
Total capital expenditures | 8.9 | 23.4 | 19.3 | 34.8
Innovative Closure Solutions | Continuing Operations |  |  |  |
Depreciation, depletion and amortization expense: |  |  |  |
Total depreciation, depletion and amortization expense | 1.3 | 1.5 | 2.7 | 3.2
Innovative Closure Solutions | Continuing Operations | Operating Segments |  |  |  |
Capital Expenditure [Abstract] |  |  |  |
Total capital expenditures | $ 1.5 | $ 0.9 | $ 5.0 | $ 1.4

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