Revenue - Schedule of Activity Related to Contract Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Change in Contract with Customer Asset [Line Items]
Balance at December 31, 2018	$ 59.7	$ 53.7	$ 50.5
Net revenue billed	(3.3)	6.0	3.2
Balance at March 31, 2019	56.4	59.7	53.7
Composite Materials
Change in Contract with Customer Asset [Line Items]
Balance at December 31, 2018	13.2	11.5	12.9
Net revenue billed	(1.7)	1.7	(1.4)
Balance at March 31, 2019	11.5	13.2	11.5
Engineered Products
Change in Contract with Customer Asset [Line Items]
Balance at December 31, 2018	46.5	42.2	37.6
Net revenue billed	(1.6)	4.3	4.6
Balance at March 31, 2019	$ 44.9	$ 46.5	$ 42.2