Segment Information - Schedule of Goodwill and Intangible Assets by Segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	$ 277.8
Amortization Expense	1.8
Currency translation adjustments	(5.2)
Balance at the end of the period	274.4
Composite Materials
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	98.7
Amortization Expense	0.5
Currency translation adjustments	(2.7)
Balance at the end of the period	96.5
Engineered Products
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	179.1
Amortization Expense	1.3
Currency translation adjustments	(2.5)
Balance at the end of the period	$ 177.9