Segment Information - Schedule of Goodwill and Intangible Assets by Segment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Goodwill and intangible assets	$ 59.1	$ 59.8
Goodwill And Intangible Asset Impairment	0
Composite Materials
Segment Reporting Information [Line Items]
Goodwill and intangible assets	43.0	43.7
Engineered Products
Segment Reporting Information [Line Items]
Goodwill and intangible assets	$ 16.1	$ 16.1