Segment Information (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended			9 Months Ended
	Jun. 30, 2012	Jan. 31, 2011	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net sales to external customers:
Net sales to external customers			$ 391.6		$ 351.8	$ 1,190.9	$ 1,037.1
Total sales			391.6		351.8	1,190.9	1,037.1
Operating income			60.0		46.0	194.5	142.6
Depreciation and amortization			14.7		13.7	43.0	41.6
Stock-based compensation expense			2.6		2.5	13.1	11.3
Other operating (income) expense					2.7	(9.5)	(3.0)
Accrual basis additions to capital expenditures			60.2		49.2	174.7	104.3
Other operating (income) expense	(9.6)
Pre-tax gain recorded on the sale of land from a previously closed manufacturing facility				4.9
Unrecognized service credits as a curtailment gain in U.K. plan		5.7					5.7
Increase in environmental remediation reserve	5.0
Commercial aerospace
Net sales to external customers:
Net sales to external customers			234.1		207.4	709.9	612.8
Space and defense
Net sales to external customers:
Net sales to external customers			90.6		80.9	263.6	242.3
Industrial
Net sales to external customers:
Net sales to external customers			66.9		63.5	217.4	182.0
Composite Materials
Net sales to external customers:
Net sales to external customers			299.9		262.4	932.8	795.5
Intersegment sales			14.0		14.6	44.8	42.4
Total sales			313.9		277.0	977.6	837.9
Operating income			57.0		45.1	203.7	143.4
Depreciation and amortization			13.4		12.5	39.6	38.2
Stock-based compensation expense			0.7		0.9	3.7	3.4
Other operating (income) expense						(14.5)	(5.7)
Accrual basis additions to capital expenditures			55.6		46.5	166.2	99.2
Other operating (income) expense						(9.6)
Pre-tax gain recorded on the sale of land from a previously closed manufacturing facility						4.9
Unrecognized service credits as a curtailment gain in U.K. plan							5.7
Composite Materials | Commercial aerospace
Net sales to external customers:
Net sales to external customers			164.3		138.4	516.2	432.5
Composite Materials | Space and defense
Net sales to external customers:
Net sales to external customers			68.7		60.7	199.8	183.1
Composite Materials | Industrial
Net sales to external customers:
Net sales to external customers			66.9		63.3	216.8	179.9
Engineered Products
Net sales to external customers:
Net sales to external customers			91.7		89.4	258.1	241.6
Intersegment sales			0.9		0.3	1.2	0.8
Total sales			92.6		89.7	259.3	242.4
Operating income			14.9		16.2	38.4	40.6
Depreciation and amortization			1.2		1.1	3.3	3.2
Stock-based compensation expense			0.2		0.5	0.7	0.9
Accrual basis additions to capital expenditures			4.6		2.2	8.3	4.6
Engineered Products | Commercial aerospace
Net sales to external customers:
Net sales to external customers			69.8		69.0	193.7	180.3
Engineered Products | Space and defense
Net sales to external customers:
Net sales to external customers			21.9		20.2	63.8	59.2
Engineered Products | Industrial
Net sales to external customers:
Net sales to external customers					0.2	0.6	2.1
Corporate and Other
Net sales to external customers:
Intersegment sales			(14.9)		(14.9)	(46.0)	(43.2)
Total sales			(14.9)		(14.9)	(46.0)	(43.2)
Operating income			(11.9)		(15.3)	(47.6)	(41.4)
Depreciation and amortization			0.1		0.1	0.1	0.2
Stock-based compensation expense			1.7		1.1	8.7	7.0
Other operating (income) expense					2.7	5.0	2.7
Accrual basis additions to capital expenditures					0.5	0.2	0.5
Increase in environmental remediation reserve						$ 5.0	$ 2.7