Goodwill and Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Composite Materials	Dec. 31, 2010 Composite Materials	Dec. 31, 2011 Engineered Products	Dec. 31, 2010 Engineered Products	Dec. 31, 2009 Engineered Products
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	$ 56.2	$ 56.7	$ 40.1	$ 40.6	$ 16.1	$ 16.1	$ 16.1
Current year additions	1.3		1.3
Currency translation adjustments and other	(0.1)	(0.5)	(0.1)	(0.5)
Balance at the end of the period	57.4	56.2	41.3	40.1	16.1	16.1	16.1
Indefinite-lived intangible assets	3.6
Goodwill	$ 53.8