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Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Total sales $ 456.5 $ 472.3
Cost of sales 354.1 354.1
Gross margin 102.4 118.2
Selling, general and administrative expenses 43.3 49.0
Research and technology expenses 13.8 15.1
Other operating expense 1.1 1.2
Operating income (loss) 44.2 52.9
Depreciation and amortization 29.8 31.0
Stock-based compensation 9.7 13.1
Accrual basis additions to capital expenditures 17.1 18.6
Intersegment Elimination    
Segment Reporting Information [Line Items]    
Total sales [1] (20.4) (23.6)
Composite Materials    
Segment Reporting Information [Line Items]    
Total sales 365.3 379.5
Composite Materials | Intersegment Elimination    
Segment Reporting Information [Line Items]    
Total sales 20.1 23.3
Composite Materials | Operating Segments    
Segment Reporting Information [Line Items]    
Total sales 385.4 402.8
Cost of sales 293.5 300.3
Gross margin 91.9 102.5
Selling, general and administrative expenses 25.5 25.3
Research and technology expenses 11.8 12.6
Other operating expense 0.0 0.8
Operating income (loss) 54.6 63.7
Depreciation and amortization 26.6 27.2
Stock-based compensation 3.0 3.1
Accrual basis additions to capital expenditures 15.5 16.7
Engineered Products    
Segment Reporting Information [Line Items]    
Total sales 91.2 92.8
Engineered Products | Intersegment Elimination    
Segment Reporting Information [Line Items]    
Total sales 0.3 0.3
Engineered Products | Operating Segments    
Segment Reporting Information [Line Items]    
Total sales 91.5 93.1
Cost of sales 79.9 73.3
Gross margin 11.6 19.8
Selling, general and administrative expenses 4.3 5.4
Research and technology expenses 1.1 1.2
Other operating expense 1.1 0.4
Operating income (loss) 5.1 12.9
Depreciation and amortization 3.2 3.8
Stock-based compensation 0.8 0.8
Accrual basis additions to capital expenditures 1.6 1.9
Corporate & Other    
Segment Reporting Information [Line Items]    
Total sales [1] (20.4) (23.6)
Corporate & Other | Operating Segments    
Segment Reporting Information [Line Items]    
Cost of sales [1] (19.3) (19.5)
Gross margin [1] (1.1) (4.1)
Selling, general and administrative expenses [1] 13.5 18.3
Research and technology expenses [1] 0.9 1.3
Other operating expense [1] 0.0 0.0
Operating income (loss) [1] (15.5) (23.7)
Depreciation and amortization [1] 0.0 0.0
Stock-based compensation [1] 5.9 9.2
Accrual basis additions to capital expenditures [1] $ 0.0 $ 0.0
[1] We do not allocate corporate expenses to the operating segments.