Goodwill and Purchased Intangible Assets - Schedule of Gross Goodwill and Other Purchased Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	$ 58.9	$ 59.8
Amortization expense	(0.3)	(0.3)
Additions	18.1
Currency translation adjustments and other	(4.5)	(0.6)
Balance at the end of the period	72.2	58.9
Composite Materials
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	42.8	43.7
Amortization expense	(0.3)	(0.3)
Additions	18.1
Currency translation adjustments and other	(4.5)	(0.6)
Balance at the end of the period	56.1	42.8
Engineered Products
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	16.1	16.1
Balance at the end of the period	$ 16.1	$ 16.1