Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment information
Total sales	$ 461.7	$ 416.5
Operating income (loss)	74.6	63.0
Depreciation and amortization	17.1	14.3
Stock-based compensation expense	8.8	8.7
Accrual basis additions to capital expenditures	40.0	41.4
Composite Materials
Segment information
Total sales	374.8	341.5
Operating income (loss)	75.9	67.9
Depreciation and amortization	15.6	13.1
Stock-based compensation expense	3.3	2.0
Accrual basis additions to capital expenditures	38.4	38.4
Engineered Products
Segment information
Total sales	105.5	92.3
Operating income (loss)	16.4	13.4
Depreciation and amortization	1.4	1.2
Stock-based compensation expense	0.7	0.5
Accrual basis additions to capital expenditures	1.6	3.0
Corporate and Other
Segment information
Total sales	(18.6)	(17.3)
Operating income (loss)	(17.7)	(18.3)
Depreciation and amortization	0.1
Stock-based compensation expense	4.8	6.2
Operating Segments
Segment information
Total sales	461.7	416.5
Operating Segments | Commercial aerospace
Segment information
Total sales	303.2	268.9
Operating Segments | Space and defense
Segment information
Total sales	95.6	96.0
Operating Segments | Industrial
Segment information
Total sales	62.9	51.6
Operating Segments | Composite Materials
Segment information
Total sales	356.3	324.8
Operating Segments | Composite Materials | Commercial aerospace
Segment information
Total sales	224.8	201.7
Operating Segments | Composite Materials | Space and defense
Segment information
Total sales	68.6	72.8
Operating Segments | Composite Materials | Industrial
Segment information
Total sales	62.9	50.3
Operating Segments | Engineered Products
Segment information
Total sales	105.4	91.7
Operating Segments | Engineered Products | Commercial aerospace
Segment information
Total sales	78.4	67.2
Operating Segments | Engineered Products | Space and defense
Segment information
Total sales	27.0	23.2
Operating Segments | Engineered Products | Industrial
Segment information
Total sales		1.3
Intersegment Elimination | Composite Materials
Segment information
Total sales	18.5	16.7
Intersegment Elimination | Engineered Products
Segment information
Total sales	0.1	0.6
Intersegment Elimination | Corporate and Other
Segment information
Total sales	$ (18.6)	$ (17.3)