Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total sales	$ 491.3	$ 522.6	$ 970.1	$ 1,020.3
Operating income	89.7	100.1	168.3	184.0
Depreciation and amortization	25.1	23.3	49.5	45.5
Stock-based compensation	2.4	2.3	13.3	12.8
Accrual basis additions to capital expenditures	77.2	68.9	170.1	142.2
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	(15.1)	(18.9)	(32.2)	(37.0)
Operating income	(14.5)	(13.2)	(30.8)	(32.3)
Depreciation and amortization		0.1		0.1
Stock-based compensation	1.0	0.9	7.8	7.7
Composite Materials
Segment Reporting Information [Line Items]
Total sales	397.3	425.3	784.8	821.1
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	15.1	18.9	32.2	37.0
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Total sales	412.4	444.2	817.0	858.1
Operating income	92.1	101.6	174.0	192.4
Depreciation and amortization	23.3	21.4	45.8	41.8
Stock-based compensation	1.2	1.1	4.6	4.2
Accrual basis additions to capital expenditures	74.5	67.2	161.1	137.2
Engineered Products
Segment Reporting Information [Line Items]
Total sales	94.0	97.3	185.3	199.2
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Total sales	94.0	97.3	185.3	199.2
Operating income	12.1	11.7	25.1	23.9
Depreciation and amortization	1.8	1.8	3.7	3.6
Stock-based compensation	0.2	0.3	0.9	0.9
Accrual basis additions to capital expenditures	$ 2.7	$ 1.7	$ 9.0	$ 5.0