Revenue - Schedule of Activity Related to Contract Assets (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Change in Contract with Customer Asset [Line Items]
Opening Balance	$ 37.7	$ 35.2	$ 38.1
Net revenue billed	6.0	2.5	(2.9)
Ending Balance	43.7	37.7	35.2
Composite Materials
Change in Contract with Customer Asset [Line Items]
Opening Balance	17.0	14.6	15.1
Net revenue billed	(1.8)	2.4	(0.5)
Ending Balance	15.2	17.0	14.6
Engineered Products
Change in Contract with Customer Asset [Line Items]
Opening Balance	20.7	20.6	23.0
Net revenue billed	7.8	0.1	(2.4)
Ending Balance	$ 28.5	$ 20.7	$ 20.6

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044

Name:	us-gaap_ContractWithCustomerAssetNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant