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BUSINESS SEGMENT INFORMATION - Geographic Area (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | $ 1,072.8 | $ 1,078.4 | $ 2,067.6 | $ 2,095.1
Raw material costs | 553.0 | 609.7 | 1,068.3 | 1,192.3
Manufacturing costs | 272.8 | 220.2 | 549.7 | 454.9
Costs of products sold | 825.8 | 829.9 | 1,618.0 | 1,647.2
Selling, general and administrative expenses | 191.7 | 159.9 | 337.8 | 320.1
Acquisition and integration related costs | 1.4 | 1.3 | 2.1 | 4.1
Restructuring charges and other | 15.7 | 9.1 | 29.9 | 12.4
Non-cash asset impairment charges | 4.5 | 17.2 | 4.7 | 17.5
Loss (gain) on disposal of properties, plants and equipment, net | (1.7) | 0.1 | (217.4) | (2.3)
Loss on disposal of businesses, net | 0.0 | 0.2 | 0.5 | 1.3
Operating profit | 35.4 | 60.7 | 292.0 | 94.8
Customized Polymer Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 344.8 | 322.5 | 649.9 | 616.9
Raw material costs | 153.0 | 155.0 | 288.8 | 305.6
Manufacturing costs | 117.7 | 90.7 | 229.2 | 175.9
Costs of products sold | 270.7 | 245.7 | 518.0 | 481.5
Selling, general and administrative expenses | 66.6 | 56.3 | 118.4 | 109.5
Acquisition and integration related costs | 0.7 | 1.3 | 1.4 | 4.1
Restructuring charges and other | 3.9 | 0.6 | 6.2 | 1.7
Non-cash asset impairment charges | 0.0 | 0.7 | 0.0 | 1.0
Loss (gain) on disposal of properties, plants and equipment, net | 0.4 | 0.1 | 0.4 | 0.2
Loss on disposal of businesses, net |  | 0.0 | 0.5 | 0.0
Operating profit | 2.5 | 17.8 | 5.0 | 18.9
Durable Metal Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 380.4 | 372.9 | 735.2 | 728.8
Raw material costs | 211.2 | 236.3 | 411.2 | 472.9
Manufacturing costs | 79.9 | 52.8 | 164.0 | 103.1
Costs of products sold | 291.1 | 289.1 | 575.2 | 576.0
Selling, general and administrative expenses | 48.1 | 40.8 | 82.2 | 80.3
Acquisition and integration related costs | 0.0 | 0.0 | 0.0 | 0.0
Restructuring charges and other | 4.6 | 0.7 | 8.4 | 1.4
Non-cash asset impairment charges | 0.0 | 2.1 | 0.0 | 2.1
Loss (gain) on disposal of properties, plants and equipment, net | (2.4) | (1.1) | (2.5) | (3.9)
Loss on disposal of businesses, net |  | 0.2 | 0.0 | 1.3
Operating profit | 39.0 | 41.1 | 71.9 | 71.6
Sustainable Fiber Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 321.8 | 360.7 | 633.7 | 704.7
Raw material costs | 179.0 | 208.6 | 357.3 | 394.0
Manufacturing costs | 71.5 | 74.0 | 139.9 | 168.3
Costs of products sold | 250.5 | 282.6 | 497.2 | 562.3
Selling, general and administrative expenses | 69.6 | 57.6 | 123.7 | 119.1
Acquisition and integration related costs | 0.0 | 0.0 | 0.0 | 0.0
Restructuring charges and other | 7.1 | 7.6 | 15.1 | 9.0
Non-cash asset impairment charges | 4.5 | 14.0 | 4.7 | 14.0
Loss (gain) on disposal of properties, plants and equipment, net | 0.3 | 1.1 | (215.3) | 1.4
Loss on disposal of businesses, net |  | 0.0 | 0.0 | 0.0
Operating profit | (10.2) | (2.2) | 208.3 | (1.1)
Innovative Closure Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 25.8 | 22.3 | 48.8 | 44.7
Raw material costs | 9.8 | 9.8 | 11.0 | 19.8
Manufacturing costs | 3.7 | 2.7 | 16.6 | 7.6
Costs of products sold | 13.5 | 12.5 | 27.6 | 27.4
Selling, general and administrative expenses | 7.4 | 5.2 | 13.5 | 11.2
Acquisition and integration related costs | 0.7 | 0.0 | 0.7 | 0.0
Restructuring charges and other | 0.1 | 0.2 | 0.2 | 0.3
Non-cash asset impairment charges | 0.0 | 0.4 | 0.0 | 0.4
Loss (gain) on disposal of properties, plants and equipment, net | 0.0 | 0.0 | 0.0 | 0.0
Loss on disposal of businesses, net |  | 0.0 | 0.0 | 0.0
Operating profit | 4.1 | 4.0 | 6.8 | 5.4
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 531.0 | 571.3 | 1,024.8 | 1,095.1
United States | Customized Polymer Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 145.7 | 142.6 | 270.4 | 264.7
United States | Durable Metal Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 67.8 | 72.8 | 130.3 | 136.8
United States | Sustainable Fiber Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 311.0 | 349.5 | 611.4 | 681.0
United States | Innovative Closure Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 6.5 | 6.4 | 12.7 | 12.6
Europe, Middle East and Africa |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 383.0 | 356.8 | 730.0 | 686.0
Europe, Middle East and Africa | Customized Polymer Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 147.5 | 131.2 | 275.2 | 247.2
Europe, Middle East and Africa | Durable Metal Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 223.4 | 215.4 | 432.8 | 418.0
Europe, Middle East and Africa | Sustainable Fiber Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 0.2 | 0.2 | 0.5 | 0.4
Europe, Middle East and Africa | Innovative Closure Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 11.9 | 10.0 | 21.5 | 20.4
Asia Pacific and Other Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 158.8 | 150.3 | 312.8 | 314.0
Asia Pacific and Other Americas | Customized Polymer Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 51.6 | 48.7 | 104.3 | 105.0
Asia Pacific and Other Americas | Durable Metal Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 89.2 | 84.7 | 172.1 | 174.0
Asia Pacific and Other Americas | Sustainable Fiber Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | 10.6 | 11.0 | 21.8 | 23.3
Asia Pacific and Other Americas | Innovative Closure Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales by geographic area: | $ 7.4 | $ 5.9 | $ 14.6 | $ 11.7

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