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