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Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Pension Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Periodic Pension Expense |  |  |
Defined benefit retirement plans | $ (1.6) | $ 0.6 | $ 1.6
Union sponsored multi-employer pension plan | 2.1 | 1.9 | 2.1
Retirement savings plans-matching contributions | 10.2 | 9.7 | 7.9
Retirement savings plans-profit sharing contributions | 10.2 | 9.2 | 10.6
Net periodic expense | $ 20.9 | $ 21.4 | $ 22.2

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- Definition Represents the aggregate costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost and net periodic benefit cost. + References No definition available. + Details
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- Definition Represents the amount of cost recognized during the period for employer matching contribution towards the defined contribution plans. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Represents the amount of cost recognized during the period for profit sharing contribution towards the defined contribution plans. + References No definition available. + Details
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Namespace Prefix: | hxl_
Data Type: | xbrli:monetaryItemType
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- Definition Defined contribution plan union sponsored multi employer pension plan contribution cost recognized. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Net periodic pension expenses. + References No definition available. + Details
Name: | hxl_NetPeriodicPensionExpensesAbstract
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Data Type: | xbrli:stringItemType
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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