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Revenue - Schedule of Activity Related to Contracts Assets (Details) - USD ($) $ in Millions | 3 Months Ended
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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

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- Definition 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. + References 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 + Details
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- Definition The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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