Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total sales	$ 500.5	$ 448.8	$ 1,520.8	$ 1,396.3
Operating income	89.1	78.0	273.1	251.2
Depreciation and amortization	23.5	19.3	69.0	56.5
Stock-based compensation	0.8	0.8	13.6	15.2
Accrual basis additions to capital expenditures	90.4	86.3	232.6	227.8
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	(16.2)	(15.9)	(53.2)	(56.3)
Operating income	(12.6)	(10.3)	(44.9)	(46.6)
Depreciation and amortization		0.1	0.1	0.3
Stock-based compensation	0.1		7.8	9.0
Accrual basis additions to capital expenditures	0.1		0.1
Composite Materials
Segment Reporting Information [Line Items]
Total sales	398.2	347.4	1,219.3	1,088.3
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	(16.2)	(15.9)	(53.2)	(56.2)
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Total sales	414.4	363.3	1,272.5	1,144.5
Operating income	88.8	74.1	281.2	254.5
Depreciation and amortization	21.7	17.7	63.5	51.7
Stock-based compensation	0.7	0.7	4.9	5.4
Accrual basis additions to capital expenditures	84.4	83.1	221.6	216.8
Engineered Products
Segment Reporting Information [Line Items]
Total sales	102.3	101.4	301.5	308.0
Engineered Products | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales				(0.1)
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Total sales	102.3	101.4	301.5	308.1
Operating income	12.9	14.2	36.8	43.3
Depreciation and amortization	1.8	1.5	5.4	4.5
Stock-based compensation		0.1	0.9	0.8
Accrual basis additions to capital expenditures	$ 5.9	$ 3.2	$ 10.9	$ 11.0