| Three Months Ended September 30, | Three Months Ended June 30, | Three Months Ended March 31, | Three Months Ended December 31, | ||||||||||||||||||||
| (in millions) | 2025 | 2025 | 2025 | 2024 | |||||||||||||||||||
| Net sales: | |||||||||||||||||||||||
| Customized Polymer Solutions | $ | 322.7 | $ | 337.9 | $ | 322.5 | $ | 294.4 | |||||||||||||||
| Durable Metal Solutions | 391.9 | 392.3 | 372.9 | 355.9 | |||||||||||||||||||
| Sustainable Fiber Solutions | 355.2 | 370.7 | 360.7 | 344.0 | |||||||||||||||||||
| Innovative Closure Solutions | 24.5 | 25.0 | 22.3 | 22.4 | |||||||||||||||||||
| Total net sales | $ | 1,094.3 | $ | 1,125.9 | $ | 1,078.4 | $ | 1,016.7 | |||||||||||||||
| Gross profit: | |||||||||||||||||||||||
| Customized Polymer Solutions | $ | 70.2 | $ | 70.9 | $ | 76.8 | $ | 58.6 | |||||||||||||||
| Durable Metal Solutions | 83.6 | 88.1 | 83.8 | 69.0 | |||||||||||||||||||
| Sustainable Fiber Solutions | 85.1 | 85.1 | 78.1 | 64.3 | |||||||||||||||||||
| Innovative Closure Solutions | 10.3 | 11.9 | 9.8 | 7.5 | |||||||||||||||||||
| Total gross profit | $ | 249.2 | $ | 256.0 | $ | 248.5 | $ | 199.4 | |||||||||||||||
| Operating profit (loss): | |||||||||||||||||||||||
| Customized Polymer Solutions | $ | 1.5 | $ | 8.4 | $ | 17.8 | $ | 1.1 | |||||||||||||||
| Durable Metal Solutions | 36.5 | 45.8 | 41.1 | 30.5 | |||||||||||||||||||
| Sustainable Fiber Solutions | (5.6) | 5.0 | (2.2) | 1.1 | |||||||||||||||||||
| Innovative Closure Solutions | 2.6 | 4.5 | 4.0 | 1.4 | |||||||||||||||||||
| Total operating profit | $ | 35.0 | $ | 63.7 | $ | 60.7 | $ | 34.1 | |||||||||||||||
Adjusted EBITDA(1): | |||||||||||||||||||||||
| Customized Polymer Solutions | $ | 44.5 | $ | 37.1 | $ | 43.4 | $ | 28.5 | |||||||||||||||
| Durable Metal Solutions | 57.0 | 53.6 | 50.0 | 36.8 | |||||||||||||||||||
| Sustainable Fiber Solutions | 61.5 | 48.8 | 46.3 | 29.5 | |||||||||||||||||||
| Innovative Closure Solutions | 5.2 | 7.6 | 6.2 | 4.0 | |||||||||||||||||||
| Total Adjusted EBITDA | $ | 168.2 | $ | 147.1 | $ | 145.9 | $ | 98.8 | |||||||||||||||
| Three Months Ended September 30, | Three Months Ended June 30, | Three Months Ended March 31, | Three Months Ended December 31, | ||||||||||||||||||||
| (in millions) | 2025 | 2025 | 2025 | 2024 | |||||||||||||||||||
| Net (loss) income | $ | (17.6) | $ | 36.9 | $ | 25.1 | $ | 11.3 | |||||||||||||||
| Plus: Interest expense, net | 14.2 | 15.8 | 15.5 | 15.9 | |||||||||||||||||||
| Plus: Income tax expense | 31.3 | 10.0 | 20.0 | 6.8 | |||||||||||||||||||
| Plus: Other expense, net | 5.5 | 1.4 | 0.2 | 0.9 | |||||||||||||||||||
| Plus: Equity earnings of unconsolidated affiliates, net of tax | 1.6 | (0.4) | (0.1) | (0.8) | |||||||||||||||||||
| Operating profit | $ | 35.0 | $ | 63.7 | $ | 60.7 | $ | 34.1 | |||||||||||||||
| Less: Equity earnings of unconsolidated affiliates, net of tax | 1.6 | (0.4) | (0.1) | (0.8) | |||||||||||||||||||
| Plus: Depreciation, depletion and amortization expense | 59.2 | 58.0 | 57.1 | 58.5 | |||||||||||||||||||
| Plus: Acquisition and integration related costs | 2.1 | 2.0 | 1.3 | 2.8 | |||||||||||||||||||
| Plus: Restructuring and other charges | 34.9 | 18.0 | 9.1 | 3.3 | |||||||||||||||||||
| Plus: Non-cash asset impairment charges | 13.5 | 7.2 | 17.2 | 0.3 | |||||||||||||||||||
| Plus: (Gain) loss on disposal of properties, plants and equipment, net | (3.7) | (3.5) | 0.1 | (2.4) | |||||||||||||||||||
| Plus: Loss on disposal of businesses, net | 0.5 | 0.3 | 0.2 | 1.1 | |||||||||||||||||||
| Plus: Other costs* | 28.3 | 1.0 | 0.1 | 0.3 | |||||||||||||||||||
| Adjusted EBITDA | $ | 168.2 | $ | 147.1 | $ | 145.9 | $ | 98.8 | |||||||||||||||
| *includes fiscal year-end change costs and share-based compensation impact of disposals of businesses | |||||||||||||||||||||||
| Three Months Ended September 30, | Three Months Ended June 30, | Three Months Ended March 31, | Three Months Ended December 31, | ||||||||||||||||||||
| (in millions) | 2025 | 2025 | 2025 | 2024 | |||||||||||||||||||
| Customized Polymer Solutions | |||||||||||||||||||||||
| Operating profit | $ | 1.5 | $ | 8.4 | $ | 17.8 | $ | 1.1 | |||||||||||||||
| Plus: Depreciation and amortization expense | 24.1 | 24.0 | 22.9 | 23.0 | |||||||||||||||||||
| Plus: Acquisition and integration related costs | 2.1 | 2.0 | 1.3 | 2.8 | |||||||||||||||||||
| Plus: Restructuring and other charges | 6.3 | 2.6 | 0.6 | 1.1 | |||||||||||||||||||
| Plus: Non-cash asset impairment charges | 2.5 | — | 0.7 | 0.3 | |||||||||||||||||||
| Plus: (Gain) loss on disposal of properties, plants and equipment, net | — | (0.2) | 0.1 | 0.1 | |||||||||||||||||||
| Plus: Other costs* | 8.0 | 0.3 | — | 0.1 | |||||||||||||||||||
| Adjusted EBITDA | $ | 44.5 | $ | 37.1 | $ | 43.4 | $ | 28.5 | |||||||||||||||
| Durable Metal Solutions | |||||||||||||||||||||||
| Operating profit | $ | 36.5 | $ | 45.8 | $ | 41.1 | $ | 30.5 | |||||||||||||||
| Plus: Depreciation and amortization expense | 7.0 | 7.3 | 7.0 | 7.2 | |||||||||||||||||||
| Plus: Restructuring and other charges | 9.1 | 2.6 | 0.7 | 0.7 | |||||||||||||||||||
| Plus: Non-cash asset impairment charges | — | 0.1 | 2.1 | — | |||||||||||||||||||
Plus: Gain on disposal of properties, plants and equipment, net | (3.8) | (2.7) | (1.1) | (2.8) | |||||||||||||||||||
| Plus: Loss on disposal of businesses, net | — | 0.3 | 0.2 | 1.1 | |||||||||||||||||||
| Plus: Other costs* | 8.2 | 0.2 | — | 0.1 | |||||||||||||||||||
| Adjusted EBITDA | $ | 57.0 | $ | 53.6 | $ | 50.0 | $ | 36.8 | |||||||||||||||
| Sustainable Fiber Solutions | |||||||||||||||||||||||
| Operating (loss) profit | $ | (5.6) | $ | 5.0 | $ | (2.2) | $ | 1.1 | |||||||||||||||
| Plus: Depreciation, depletion and amortization expense | 27.0 | 25.0 | 25.7 | 26.6 | |||||||||||||||||||
| Plus: Restructuring and other charges | 17.6 | 11.9 | 7.6 | 1.4 | |||||||||||||||||||
| Plus: Non-cash asset impairment charges | 11.0 | 7.1 | 14.0 | — | |||||||||||||||||||
| Plus: (Gain) loss on disposal of properties, plants and equipment, net | — | (0.6) | 1.1 | 0.3 | |||||||||||||||||||
| Plus: Loss on disposal of businesses, net | 0.5 | — | — | — | |||||||||||||||||||
| Plus: Other costs* | 11.0 | 0.4 | 0.1 | 0.1 | |||||||||||||||||||
| Adjusted EBITDA | $ | 61.5 | $ | 48.8 | $ | 46.3 | $ | 29.5 | |||||||||||||||
| Innovative Closure Solutions | |||||||||||||||||||||||
| Operating profit | $ | 2.6 | $ | 4.5 | $ | 4.0 | $ | 1.4 | |||||||||||||||
| Less: Equity earnings of unconsolidated affiliates, net of tax | 1.6 | (0.4) | (0.1) | (0.8) | |||||||||||||||||||
| Plus: Depreciation and amortization expense | 1.1 | 1.7 | 1.5 | 1.7 | |||||||||||||||||||
| Plus: Restructuring and other charges | 1.9 | 0.9 | 0.2 | 0.1 | |||||||||||||||||||
| Plus: Non-cash asset impairment charges | — | — | 0.4 | — | |||||||||||||||||||
| Plus: Loss on disposal of properties, plants and equipment, net | 0.1 | — | — | — | |||||||||||||||||||
| Plus: Other costs* | 1.1 | 0.1 | — | — | |||||||||||||||||||
| Adjusted EBITDA | $ | 5.2 | $ | 7.6 | $ | 6.2 | $ | 4.0 | |||||||||||||||
| *includes fiscal year-end change costs and share-based compensation impact of disposals of businesses | |||||||||||||||||||||||