Revenue - Schedule of Activity Related to Contract Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Change in Contract with Customer Asset [Line Items]
Beginning Balance	$ 54.7	$ 55.9	$ 52.7
Net revenue billed	(5.8)	(1.2)	3.2
Ending Balance	48.9	54.7	55.9
Composite Materials
Change in Contract with Customer Asset [Line Items]
Beginning Balance	11.9	11.4	12.8
Net revenue billed	(3.2)	0.5	(1.4)
Ending Balance	8.7	11.9	11.4
Engineered Products
Change in Contract with Customer Asset [Line Items]
Beginning Balance	42.8	44.5	39.9
Net revenue billed	(2.6)	(1.7)	4.6
Ending Balance	$ 40.2	$ 42.8	$ 44.5