Goodwill and Purchased Intangible Assets - Schedule of Gross Goodwill and Other Purchased Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	$ 251.3	$ 256.0
Amortization expense	(6.8)	(6.8)
Intangible Asset Impairment	(5.2)
Currency translation adjustments and other	(2.3)	2.1
Balance at the end of the period	237.0	251.3
Composite Materials
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	87.2	86.9
Amortization expense	(1.8)	(1.8)
Intangible Asset Impairment	0.0
Currency translation adjustments and other	(2.3)	2.1
Balance at the end of the period	83.1	87.2
Engineered Products
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	164.1	169.1
Amortization expense	(5.0)	(5.0)
Intangible Asset Impairment	(5.2)
Currency translation adjustments and other	0.0	0.0
Balance at the end of the period	$ 153.9	$ 164.1