Revenue - Schedule of Activity Related to Contract Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Change in Contract with Customer Asset [Line Items]
Beginning Balance	$ 40.5	$ 42.3	$ 43.1
Net revenue billed	(2.1)	(1.8)	(0.8)
Ending Balance	38.4	40.5	42.3
Composite Materials
Change in Contract with Customer Asset [Line Items]
Beginning Balance	7.6	9.4	7.8
Net revenue billed	(0.3)	(1.8)	1.6
Ending Balance	7.3	7.6	9.4
Engineered Products
Change in Contract with Customer Asset [Line Items]
Beginning Balance	32.9	32.9	35.3
Net revenue billed	(1.8)		(2.4)
Ending Balance	$ 31.1	$ 32.9	$ 32.9