Revenue - Schedule of Activity Related to Contract Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in Contract with Customer Asset [Line Items]
Beginning Balance	$ 52.7	$ 50.5
Net revenue billed	(9.6)	2.2
Ending Balance	43.1	52.7
Composite Materials
Change in Contract with Customer Asset [Line Items]
Beginning Balance	12.8	12.9
Net revenue billed	(5.0)	(0.1)
Ending Balance	7.8	12.8
Engineered Products
Change in Contract with Customer Asset [Line Items]
Beginning Balance	39.9	37.6
Net revenue billed	(4.6)	2.3
Ending Balance	$ 35.3	$ 39.9