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Commitments and Contingencies - Schedule of Product Warranty (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes in accrued product warranty cost |  |  |
Balance at the beginning of the period | $ 5.5 | $ 4.8 | $ 3.6
Warranty expense | 1.7 | 2.9 | 4.6
Deductions and other | (4.6) | (2.2) | (3.4)
Balance at the end of the period | $ 2.6 | $ 5.5 | $ 4.8

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- Definition Represents the aggregate decrease in the liability for accruals related to standard product warranties, which exclude warranties issued during the period. It also does not include any increase in the liability for accruals related to extended product warranties. + References No definition available. + Details
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Namespace Prefix: | hxl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Standard product warranty expense (benefit). + References No definition available. + Details
Name: | hxl_StandardProductWarrantyExpenseBenefit
Namespace Prefix: | hxl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
Name: | us-gaap_StandardProductWarrantyAccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant