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Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Total sales $ 489.9 $ 500.4 $ 946.4 $ 972.7
Cost of sales 378.4 373.8 732.5 727.9
Gross margin 111.5 126.6 213.9 244.8
Selling, general and administrative expenses 43.0 39.9 86.3 88.9
Research and technology expenses 14.3 14.7 28.1 29.8
Other operating expense 24.2 0.2 25.3 1.4
Operating income (loss) 30.0 71.8 74.2 124.7
Depreciation and amortization 29.6 31.0 60.6 62.0
Stock-based compensation 2.7 3.3 12.4 16.4
Accrual basis additions to capital expenditures 14.7 22.5 31.8 41.1
Intersegment Elimination        
Segment Reporting Information [Line Items]        
Total sales 0.0 0.0 0.0 0.0
Composite Materials        
Segment Reporting Information [Line Items]        
Total sales 393.2 408.6 758.5 788.1
Composite Materials | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Total sales 19.4 23.9 39.5 47.2
Composite Materials | Operating Segments        
Segment Reporting Information [Line Items]        
Total sales 412.6 432.5 798.0 835.3
Cost of sales 315.7 322.5 609.2 622.8
Gross margin 96.9 110.0 188.8 212.5
Selling, general and administrative expenses 26.3 23.2 51.8 48.6
Research and technology expenses 12.3 12.5 24.1 25.1
Other operating expense 0.0 0.0 0.0 0.8
Operating income (loss) 58.3 74.3 112.9 138.0
Depreciation and amortization 26.9 27.3 54.1 54.5
Stock-based compensation 0.9 1.1 3.9 4.2
Accrual basis additions to capital expenditures 13.1 18.6 28.6 35.3
Engineered Products        
Segment Reporting Information [Line Items]        
Total sales 96.7 91.8 187.9 184.6
Engineered Products | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Total sales 0.4 0.6 0.7 0.9
Engineered Products | Operating Segments        
Segment Reporting Information [Line Items]        
Total sales 97.1 92.4 188.6 185.5
Cost of sales 81.5 72.7 161.4 146.0
Gross margin 15.6 19.7 27.2 39.5
Selling, general and administrative expenses 4.0 5.3 8.3 10.6
Research and technology expenses 1.0 1.2 2.1 2.4
Other operating expense 24.2 0.2 25.3 0.6
Operating income (loss) (13.6) 13.0 (8.5) 25.9
Depreciation and amortization 2.7 3.7 6.5 7.5
Stock-based compensation 0.2 0.3 1.0 1.1
Accrual basis additions to capital expenditures 1.6 3.9 3.2 5.8
Corporate & Other and Intersegment Elimination        
Segment Reporting Information [Line Items]        
Total sales [1] 0.0 0.0 0.0 0.0
Corporate & Other and Intersegment Elimination | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Total sales [1] (19.8) (24.5) (40.2) (48.1)
Corporate & Other and Intersegment Elimination | Operating Segments        
Segment Reporting Information [Line Items]        
Total sales [1] (19.8) (24.5) (40.2) (48.1)
Cost of sales [1] (18.8) (21.4) (38.1) (40.9)
Gross margin [1] (1.0) (3.1) (2.1) (7.2)
Selling, general and administrative expenses [1] 12.7 11.4 26.2 29.7
Research and technology expenses [1] 1.0 1.0 1.9 2.3
Other operating expense [1] 0.0 0.0 0.0 0.0
Operating income (loss) [1] (14.7) (15.5) (30.2) (39.2)
Depreciation and amortization [1] 0.0 0.0 0.0 0.0
Stock-based compensation [1] 1.6 1.9 7.5 11.1
Accrual basis additions to capital expenditures [1] $ 0.0 $ 0.0 $ 0.0 $ 0.0
[1] We do not allocate corporate expenses to the operating segments.