Revenue - Schedule of Activity Related to Contracts Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018
Change in Contract with Customer Asset [Line Items]
Opening Balance	$ 35.2	$ 38.1
Net revenue billed		(2.9)
Increase in unbilled revenue	2.5
Ending Balance	37.7	35.2
Composite Materials
Change in Contract with Customer Asset [Line Items]
Opening Balance	14.6	15.1
Net revenue billed		(0.5)
Increase in unbilled revenue	2.4
Ending Balance	17.0	14.6
Engineered Products
Change in Contract with Customer Asset [Line Items]
Opening Balance	20.6	23.0
Net revenue billed		(2.4)
Increase in unbilled revenue	0.1
Ending Balance	$ 20.7	$ 20.6