Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Sales	[1],[2]	$ 1,903.0	$ 1,789.0	$ 1,577.7
Operating income (loss)		186.1	215.3	175.2
Depreciation and amortization		124.0	124.8	126.2
Equity in earnings (losses) from affiliated companies			8.1	8.1
Other operating expense (income)		50.0	1.4	(11.9)
Segment assets		2,725.6	2,918.5	2,837.3
Investments in affiliated companies		5.0	5.0	47.6
Accrual basis additions to property, plant and equipment		81.1	121.6	69.8
Stock-based compensation		22.2	20.9	20.0
Cost of sales		1,433.2	1,355.8	1,220.6
Gross margin		469.8	433.2	357.1
Selling, general and administrative expenses		176.6	163.8	148.0
Research and technology expenses		57.1	52.7	45.8
Intersegment Elimination
Segment Reporting Information [Line Items]
Sales		(91.2)	(73.0)	(69.1)
Composite Materials
Segment Reporting Information [Line Items]
Sales		1,531.0	1,474.2	1,279.7
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Sales		1,621.0	1,544.8	1,346.0
Operating income (loss)		215.0	237.9	178.2
Depreciation and amortization		109.1	110.4	112.0
Other operating expense (income)		40.8	1.2	7.5
Segment assets		2,147.6	2,309.3	2,269.4
Investments in affiliated companies				1.5
Accrual basis additions to property, plant and equipment		67.1	70.9	58.3
Stock-based compensation		6.1	6.2	5.8
Cost of sales		1,218.8	1,165.1	1,039.6
Gross margin		402.2	379.7	306.4
Selling, general and administrative expenses		98.3	95.5	82.8
Research and technology expenses		48.1	45.1	37.9
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Sales		90.0	70.6	66.3
Engineered Products
Segment Reporting Information [Line Items]
Sales		372.0	314.8	298.0
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Sales		373.2	317.2	300.8
Operating income (loss)		39.6	32.8	36.6
Depreciation and amortization		14.9	14.4	14.1
Equity in earnings (losses) from affiliated companies			8.1	8.1
Other operating expense (income)		7.7	0.2	0.0
Segment assets		541.4	543.1	523.2
Investments in affiliated companies				38.6
Accrual basis additions to property, plant and equipment		14.0	50.7	11.4
Stock-based compensation		1.5	1.7	1.6
Cost of sales		299.5	261.1	244.0
Gross margin		73.7	56.1	56.8
Selling, general and administrative expenses		21.7	19.0	15.7
Research and technology expenses		4.7	4.1	4.5
Engineered Products | Intersegment Elimination
Segment Reporting Information [Line Items]
Sales		1.2	2.4	2.8
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Sales		(91.2)	(73.0)	(69.1)
Corporate & Other and Intersegment Elimination | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)		(68.5)	(55.4)	(39.6)
Depreciation and amortization			0.0	0.1
Other operating expense (income)		1.5	0.0	(19.4)
Segment assets		36.6	66.1	44.7
Investments in affiliated companies		5.0	5.0	7.5
Accrual basis additions to property, plant and equipment				0.1
Stock-based compensation		14.6	13.0	12.6
Cost of sales		(85.1)	(70.4)	(63.0)
Gross margin		(6.1)	(2.6)	(6.1)
Selling, general and administrative expenses		56.6	49.3	49.5
Research and technology expenses		$ 4.3	$ 3.5	$ 3.4

[1] Net sales by geography based on the location in which the product sold was manufactured.

[2] Net sales to external customers based on the location to which the product sold was delivered.