Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total sales	$ 541.0	$ 609.9
Other operating expense	14.7
Operating income	65.7	102.8
Depreciation and amortization	35.5	38.7
Stock-based compensation	14.4	11.1
Accrual basis additions to capital expenditures	21.9	57.5
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	(25.3)	(19.3)
Other operating expense	13.8
Operating income	(32.3)	(24.5)
Stock-based compensation	8.5	6.2
Composite Materials
Segment Reporting Information [Line Items]
Total sales	438.5	487.7
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	24.8	19.2
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Total sales	463.3	506.9
Other operating expense	0.6
Operating income	91.5	112.5
Depreciation and amortization	31.8	34.9
Stock-based compensation	4.7	4.1
Accrual basis additions to capital expenditures	20.2	56.8
Engineered Products
Segment Reporting Information [Line Items]
Total sales	102.5	122.2
Engineered Products | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	0.5	0.1
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Total sales	103.0	122.3
Other operating expense	0.3
Operating income	6.5	14.8
Depreciation and amortization	3.7	3.8
Stock-based compensation	1.2	0.8
Accrual basis additions to capital expenditures	$ 1.7	$ 0.7