Goodwill and Purchased Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Gross Goodwill and Other Purchased Intangible Assets

Changes in the carrying amount of gross goodwill and other purchased intangibles for the years ended December 31, 2017 and 2016, by segment, are as follows

(In millions)	Composite Materials			Engineered Products		Total
Balance as of December 31, 2015	$	42.8		$	16.1	$	58.9
Amortization expense		(0.3	)		—		(0.3	)
Additions		18.1			—		18.1
Currency translation adjustments and other		(4.5	)		—		(4.5	)
Balance as of December 31, 2016	$	56.1		$	16.1	$	72.2
Amortization expense		(1.0	)		—		(1.0	)
Additions		41.2			28.9		70.1
Currency translation adjustments and other		7.4			—		7.4
Balance as of December 31, 2017	$	103.7		$	45.0	$	148.7