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Debt - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]          
Pretax charge on unamortized financing costs of credit facility and deferred expense on related interest rate swaps $ 0.5us-gaap_DeferredFinanceCostsNet 4.8us-gaap_DeferredFinanceCostsNet $ 5.0us-gaap_DeferredFinanceCostsNet $ 1.0us-gaap_DeferredFinanceCostsNet $ 4.6us-gaap_DeferredFinanceCostsNet
Senior unsecured credit facility — revolving loan due 2019          
Debt Instrument [Line Items]          
Face value 700us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= hxl_SeniorUnsecuredRevolvingCreditFacilityMaturesInSeptemberTwoThousandNineteenMember
       
Debt instrument expiration period 2019-09        
Variable interest rate basis   LIBOR + 1.25%      
Spread on variable interest rate basis 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= hxl_SeniorUnsecuredRevolvingCreditFacilityMaturesInSeptemberTwoThousandNineteenMember
       
Debt instrument, covenant terms   In accordance with the terms of the new facility, we are required to maintain a minimum interest coverage ratio of 3.50 (based on the ratio of EBITDA, as defined in the credit agreement, to interest expense) and may not exceed a maximum leverage ratio of 3.50 (based on the ratio of total debt to EBITDA) throughout the term of the new facility.      
Senior unsecured credit facility — revolving loan due 2019 | Maximum          
Debt Instrument [Line Items]          
Interest coverage ratio required to be maintained   3.50hxl_DebtInstrumentCovenantInterestCoverageRatio
/ us-gaap_CreditFacilityAxis
= hxl_SeniorUnsecuredRevolvingCreditFacilityMaturesInSeptemberTwoThousandNineteenMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Senior secured credit facility - revolving loan due 2018          
Debt Instrument [Line Items]          
Face value 600us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= hxl_SeniorSecuredCreditFacilityRevolvingLoanMember
       
Debt instrument expiration period 2018-06        
Working capital line of credit - China          
Debt Instrument [Line Items]          
Maximum borrowing capacity   10.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
     
Amount outstanding   1.3us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
     
Revolving credit line          
Debt Instrument [Line Items]          
Face value       600us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Maximum borrowing capacity   10.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember