Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total sales	$ 448.8	$ 451.9	$ 1,396.3	$ 1,383.7
Operating income	78.0	79.0	251.2	228.7
Other operating expense				6.0
Depreciation and amortization	19.3	17.8	56.5	52.6
Stock-based compensation expense	0.8	2.5	15.2	14.0
Accrual basis additions to capital expenditures	86.3	74.4	227.8	179.2
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Total sales	(15.9)	(16.8)	(56.3)	(54.1)
Operating income	(10.3)	(12.1)	(46.6)	(52.1)
Other operating expense				6.0
Depreciation and amortization	0.1	0.1	0.3	0.2
Stock-based compensation expense		1.4	9.0	8.8
Composite Materials
Segment Reporting Information [Line Items]
Total sales	347.4	342.9	1,088.3	1,060.8
Composite Materials | Intersegment
Segment Reporting Information [Line Items]
Total sales	(15.9)	(16.4)	(56.2)	(53.1)
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Total sales	363.3	359.3	1,144.5	1,113.9
Operating income	74.1	74.4	254.5	230.1
Depreciation and amortization	17.7	16.4	51.7	48.3
Stock-based compensation expense	0.7	0.9	5.4	4.3
Accrual basis additions to capital expenditures	83.1	72.4	216.8	173.4
Engineered Products
Segment Reporting Information [Line Items]
Total sales	101.4	109.0	308.0	322.9
Engineered Products | Intersegment
Segment Reporting Information [Line Items]
Total sales		(0.4)	(0.1)	(1.0)
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Total sales	101.4	109.4	308.1	323.9
Operating income	14.2	16.7	43.3	50.7
Depreciation and amortization	1.5	1.3	4.5	4.1
Stock-based compensation expense	0.1	0.2	0.8	0.9
Accrual basis additions to capital expenditures	$ 3.2	$ 2.0	$ 11.0	$ 5.8