Goodwill and Purchased Intangible Assets - Schedule of Gross Goodwill and Other Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	$ 61.0	$ 57.8
Additions		3.0
Amortization expense	(0.3)	(0.1)
Currency translation adjustments and other	(0.9)	0.3
Balance at the end of the period	59.8	61.0
Composite Materials
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	44.9	41.7
Additions		3.0
Amortization expense	(0.3)	(0.1)
Currency translation adjustments and other	(0.9)	0.3
Balance at the end of the period	43.7	44.9
Engineered Products
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period			16.1
Balance at the end of the period	$ 16.1	$ 16.1	$ 16.1