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Segment Information - Schedule of Goodwill and Intangible Assets by Segment (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Goodwill and intangible assets | $ 73.9 | $ 58.9
Composite Materials |  |
Segment Reporting Information [Line Items] |  |
Goodwill and intangible assets | 57.9 | 42.8
Engineered Products |  |
Segment Reporting Information [Line Items] |  |
Goodwill and intangible assets | $ 16.0 | $ 16.1

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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hxl_CompositeMaterialsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hxl_EngineeredProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |