Fair Value Measurements - Additional Information (Details)	6 Months Ended
	Jun. 30, 2018 USD ($) item Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of counterparties, which experienced significant downgrades | item	0
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets	$ 0
Liabilities	$ 0
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value measurement with unobservable inputs reconciliation, number of liabilities | Liability	1
Acquisition of fair value liabilities, contingent consideration	$ 3,000,000
Level 2 | Fair Value Measured on Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	6,700,000
Derivative liabilities	10,600,000
Level 2 | Fair Value Measured on Recurring Basis | Interest Rate Swap Agreements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	$ 900,000
Derivative Asset, Measurement Input [Extensible List]	hxl:MeasurementInputLIBORYieldCurvesMember
Derivative liabilities	$ 400,000
Derivative Liability, Measurement Input [Extensible List]	hxl:MeasurementInputLIBORYieldCurvesMember
Level 2 | Fair Value Measured on Recurring Basis | Foreign Currency Forward Exchange Contracts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	$ 5,800,000
Derivative Asset, Measurement Input [Extensible List]	hxl:MeasurementInputLIBORYieldCurvesMember
Derivative liabilities	$ 10,200,000
Derivative Liability, Measurement Input [Extensible List]	us-gaap:MeasurementInputQuotedPriceMember