Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total sales		$ 500.4	$ 454.3	$ 972.7	$ 912.0
Other operating expense		0.2	0.5	1.4	0.7
Operating income (loss)		71.8	61.3	124.7	124.1
Depreciation and amortization		31.0	31.0	62.0	61.7
Stock-based compensation		3.3	2.8	16.4	15.7
Accrual basis additions to capital expenditures		22.5	53.7	41.1	70.5
Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	[1]	(24.5)	(19.0)	(48.1)	(39.3)
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	[1]	(24.5)	(19.0)	(48.1)	(39.3)
Other operating expense	[1]		0.0	0.0	0.0
Operating income (loss)	[1]	(15.5)	(9.7)	(39.2)	(32.1)
Depreciation and amortization	[1]	0.0	0.0	0.0	0.0
Stock-based compensation	[1]	1.9	1.4	11.1	10.4
Accrual basis additions to capital expenditures	[1]	0.0	0.0	0.0	0.0
Composite Materials
Segment Reporting Information [Line Items]
Total sales		408.6	378.5	788.1	756.7
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales		23.9	18.5	47.2	37.8
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Total sales		432.5	397.0	835.3	794.5
Other operating expense			0.3	0.8	0.5
Operating income (loss)		74.3	64.2	138.0	137.4
Depreciation and amortization		27.3	27.5	54.5	54.7
Stock-based compensation		1.1	1.1	4.2	4.2
Accrual basis additions to capital expenditures		18.6	12.9	35.3	26.0
Engineered Products
Segment Reporting Information [Line Items]
Total sales		91.8	75.8	184.6	155.3
Engineered Products | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales		0.6	0.5	0.9	1.5
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Total sales		92.4	76.3	185.5	156.8
Other operating expense		0.2	0.2	0.6	0.2
Operating income (loss)		13.0	6.8	25.9	18.8
Depreciation and amortization		3.7	3.5	7.5	7.0
Stock-based compensation		0.3	0.3	1.1	1.1
Accrual basis additions to capital expenditures		$ 3.9	$ 40.8	$ 5.8	$ 44.5

[1] We do not allocate corporate expenses to the operating segments.