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Debt - Schedule of Debt and Capital Lease Obligations (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Short-term borrowings $ 1.3us-gaap_LongTermDebtCurrent $ 3.0us-gaap_LongTermDebtCurrent
Long-term debt 415.0us-gaap_LongTermDebtNoncurrent 292.0us-gaap_LongTermDebtNoncurrent
Total debt 416.3us-gaap_LongTermDebt 295.0us-gaap_LongTermDebt
Working capital line of credit - China    
Debt Instrument [Line Items]    
Short-term borrowings 1.3us-gaap_LongTermDebtCurrent
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember		 3.0us-gaap_LongTermDebtCurrent
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember
Senior unsecured credit facility — revolving loan due 2019    
Debt Instrument [Line Items]    
Long-term debt 415.0us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= hxl_SeniorUnsecuredRevolvingCreditFacilityMaturesInSeptemberTwoThousandNineteenMember		  
Senior secured credit facility - revolving loan due 2018    
Debt Instrument [Line Items]    
Long-term debt   $ 292.0us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= hxl_SeniorSecuredCreditFacilityRevolvingLoanMember