Revenue - Schedule of Activity Related to Contract Assets (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021
Change in Contract with Customer Asset [Line Items]
Beginning Balance	$ 43.1	$ 43.1
Net revenue billed	(0.8)	(1.8)
Ending Balance	42.3	40.5
Composite Materials
Change in Contract with Customer Asset [Line Items]
Beginning Balance	7.8	7.8
Net revenue billed	1.6	(1.8)
Ending Balance	9.4	7.6
Engineered Products
Change in Contract with Customer Asset [Line Items]
Beginning Balance	35.3	35.3
Net revenue billed	(2.4)
Ending Balance	$ 32.9	$ 32.9