Segment Information - Schedule of Goodwill and Intangible Assets by Segment (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	$ 280.4
Amortization expense	(4.9)
Currency translation adjustments	1.1
Balance at the end of the period	276.6
Composite Materials
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	96.2
Amortization expense	(1.2)
Currency translation adjustments	1.1
Balance at the end of the period	96.1
Engineered Products
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	184.2
Amortization expense	(3.7)
Balance at the end of the period	$ 180.5