Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Total sales	$ 522.6	$ 475.7	$ 1,020.3	$ 947.5
Operating income	100.1	90.6	184.0	173.2
Depreciation and amortization	23.3	18.9	45.5	37.2
Stock-based compensation	2.3	2.4	12.8	14.4
Accrual basis additions to capital expenditures	68.9	75.0	142.2	141.5
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	(18.9)	(19.9)	(37.0)	(40.4)
Operating income	(13.2)	(15.0)	(32.3)	(36.3)
Depreciation and amortization	0.1	0.1	0.1	0.2
Stock-based compensation	0.9	1.1	7.7	9.0
Composite Materials
Segment Reporting Information [Line Items]
Total sales	425.3	373.5	821.1	740.9
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	(18.9)	(19.9)	(37.0)	(40.3)
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Total sales	444.2	393.4	858.1	781.2
Operating income	101.6	91.2	192.4	180.4
Depreciation and amortization	21.4	17.3	41.8	34.0
Stock-based compensation	1.1	1.1	4.2	4.7
Accrual basis additions to capital expenditures	67.2	71.6	137.2	133.7
Engineered Products
Segment Reporting Information [Line Items]
Total sales	97.3	102.2	199.2	206.6
Engineered Products | Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales				(0.1)
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Total sales	97.3	102.2	199.2	206.7
Operating income	11.7	14.4	23.9	29.1
Depreciation and amortization	1.8	1.5	3.6	3.0
Stock-based compensation	0.3	0.2	0.9	0.7
Accrual basis additions to capital expenditures	$ 1.7	$ 3.4	$ 5.0	$ 7.8