Segment Information (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment information
Total sales		$ 412.3	$ 391.6	$ 1,251.4	$ 1,190.9
Operating income (loss)		69.0	60.0	203.9	194.5
Depreciation and amortization		14.7	14.7	42.8	43.0
Stock-based compensation expense		2.7	2.6	14.7	13.1
Other operating (income) expense					(9.5)
Accrual basis additions to capital expenditures		39.8	60.2	121.9	174.7
Operating income resulting from the settlement of a prior period business interruption claim	9.6
Pre-tax gain recorded on the sale of land from a previously closed manufacturing facility	4.9
Increase in environmental remediation reserve	5.0
Composite Materials
Segment information
Total sales		329.7	313.9	1,013.9	977.6
Operating income (loss)		68.7	57.0	207.8	203.7
Depreciation and amortization		13.4	13.4	39.1	39.6
Stock-based compensation expense		1.0	0.7	4.3	3.7
Other operating (income) expense					(14.5)
Accrual basis additions to capital expenditures		36.8	55.6	113.2	166.2
Operating income resulting from the settlement of a prior period business interruption claim					9.6
Pre-tax gain recorded on the sale of land from a previously closed manufacturing facility					4.9
Engineered Products
Segment information
Total sales		99.8	92.6	290.5	259.3
Operating income (loss)		14.9	14.9	43.4	38.4
Depreciation and amortization		1.2	1.2	3.5	3.3
Stock-based compensation expense		0.2	0.2	0.9	0.7
Accrual basis additions to capital expenditures		3.0	4.6	8.7	8.3
Corporate and Other
Segment information
Total sales		(17.2)	(14.9)	(53.0)	(46.0)
Operating income (loss)		(14.6)	(11.9)	(47.3)	(47.6)
Depreciation and amortization		0.1	0.1	0.2	0.1
Stock-based compensation expense		1.5	1.7	9.5	8.7
Other operating (income) expense					5.0
Accrual basis additions to capital expenditures					0.2
Increase in environmental remediation reserve		5.0
Operating Segments
Segment information
Total sales		412.3	391.6	1,251.4	1,190.9
Operating Segments | Commercial aerospace
Segment information
Total sales		262.0	234.1	800.9	709.9
Operating Segments | Space and defense
Segment information
Total sales		94.4	90.6	287.1	263.6
Operating Segments | Industrial
Segment information
Total sales		55.9	66.9	163.4	217.4
Operating Segments | Composite Materials
Segment information
Total sales		312.6	299.9	962.1	932.8
Operating Segments | Composite Materials | Commercial aerospace
Segment information
Total sales		191.2	164.3	593.6	516.2
Operating Segments | Composite Materials | Space and defense
Segment information
Total sales		67.6	68.7	210.7	199.8
Operating Segments | Composite Materials | Industrial
Segment information
Total sales		53.8	66.9	157.8	216.8
Operating Segments | Engineered Products
Segment information
Total sales		99.7	91.7	289.3	258.1
Operating Segments | Engineered Products | Commercial aerospace
Segment information
Total sales		70.8	69.8	207.3	193.7
Operating Segments | Engineered Products | Space and defense
Segment information
Total sales		26.8	21.9	76.4	63.8
Operating Segments | Engineered Products | Industrial
Segment information
Total sales		2.1		5.6	0.6
Intersegment Elimination | Composite Materials
Segment information
Total sales		17.1	14.0	51.8	44.8
Intersegment Elimination | Engineered Products
Segment information
Total sales		0.1	0.9	1.2	1.2
Intersegment Elimination | Corporate and Other
Segment information
Total sales		$ (17.2)	$ (14.9)	$ (53.0)	$ (46.0)