Segment Information (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jan. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Commercial aerospace	Jun. 30, 2011 Commercial aerospace	Jun. 30, 2012 Commercial aerospace	Jun. 30, 2011 Commercial aerospace	Jun. 30, 2012 Space and defense	Jun. 30, 2011 Space and defense	Jun. 30, 2012 Space and defense	Jun. 30, 2011 Space and defense	Jun. 30, 2012 Industrial	Jun. 30, 2011 Industrial	Jun. 30, 2012 Industrial	Jun. 30, 2011 Industrial	Jun. 30, 2012 Composite Materials	Jun. 30, 2011 Composite Materials	Mar. 31, 2011 Composite Materials	Jun. 30, 2012 Composite Materials	Jun. 30, 2011 Composite Materials	Jun. 30, 2012 Composite Materials Commercial aerospace	Jun. 30, 2011 Composite Materials Commercial aerospace	Jun. 30, 2012 Composite Materials Commercial aerospace	Jun. 30, 2011 Composite Materials Commercial aerospace	Jun. 30, 2012 Composite Materials Space and defense	Jun. 30, 2011 Composite Materials Space and defense	Jun. 30, 2012 Composite Materials Space and defense	Jun. 30, 2011 Composite Materials Space and defense	Jun. 30, 2012 Composite Materials Industrial	Jun. 30, 2011 Composite Materials Industrial	Jun. 30, 2012 Composite Materials Industrial	Jun. 30, 2011 Composite Materials Industrial	Jun. 30, 2012 Engineered Products	Jun. 30, 2011 Engineered Products	Jun. 30, 2012 Engineered Products	Jun. 30, 2011 Engineered Products	Jun. 30, 2012 Engineered Products Commercial aerospace	Jun. 30, 2011 Engineered Products Commercial aerospace	Jun. 30, 2012 Engineered Products Commercial aerospace	Jun. 30, 2011 Engineered Products Commercial aerospace	Jun. 30, 2012 Engineered Products Space and defense	Jun. 30, 2011 Engineered Products Space and defense	Jun. 30, 2012 Engineered Products Space and defense	Jun. 30, 2011 Engineered Products Space and defense	Jun. 30, 2012 Engineered Products Industrial	Jun. 30, 2011 Engineered Products Industrial	Jun. 30, 2012 Engineered Products Industrial	Jun. 30, 2011 Engineered Products Industrial	Jun. 30, 2012 Corporate and Other	Jun. 30, 2011 Corporate and Other	Jun. 30, 2012 Corporate and Other	Jun. 30, 2011 Corporate and Other
Net sales to external customers:
Net sales to external customers			$ 399.2	$ 353.7	$ 799.3	$ 685.3	$ 233.5	$ 207.8	$ 475.8	$ 405.4	$ 88.1	$ 81.7	$ 173.0	$ 161.4	$ 77.6	$ 64.2	$ 150.5	$ 118.5	$ 316.7	$ 276.8		$ 632.9	$ 533.1	$ 172.4	$ 150.9	$ 351.9	$ 294.1	$ 67.2	$ 62.5	$ 131.1	$ 122.4	$ 77.1	$ 63.4	$ 149.9	$ 116.6	$ 82.5	$ 76.9	$ 166.4	$ 152.2	$ 61.1	$ 56.9	$ 123.9	$ 111.3	$ 20.9	$ 19.2	$ 41.9	$ 39.0	$ 0.5	$ 0.8	$ 0.6	$ 1.9
Intersegment sales																			14.9	13.9		30.8	27.8													0.2	0.2	0.3	0.5													(15.1)	(14.1)	(31.1)	(28.3)
Total sales			399.2	353.7	799.3	685.3													331.6	290.7		663.7	560.9													82.7	77.1	166.7	152.7													(15.1)	(14.1)	(31.1)	(28.3)
Operating income			73.9	49.4	134.5	96.6													80.9	48.5		146.7	98.3													11.7	11.9	23.5	24.4													(18.7)	(11.0)	(35.7)	(26.1)
Depreciation and amortization			14.3	13.8	28.3	27.9													13.3	12.8		26.2	25.7													1.0	1.0	2.1	2.1																0.1
Stock-based compensation expense			3.0	2.4	10.5	8.8													0.9	0.9		3.0	2.5													0.1	0.1	0.5	0.4													2.0	1.4	7.0	5.9
Other operating (income) expense			(9.5)		(9.5)	(5.7)													(14.5)			(14.5)	(5.7)																													5.0		5.0
Accrual basis additions to capital expenditures			69.8	29.9	114.5	55.1													67.0	28.4		110.6	52.7													2.6	1.5	3.7	2.4													0.2		0.2
Other operating (income) expense	(9.6)																					(9.6)
Pre-tax gain recorded on the sale of land from a previously closed manufacturing facility			4.9																			4.9
Increase in environmental remediation reserve			5.0
Unrecognized service credits as a curtailment gain in U.K. plan		$ 5.7				$ 5.7															$ 5.7