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Cost method investment additions.

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Debt instrument maturity year.

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Milestone achievement description.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Face (par) amount of debt instrument at time of issuance.

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Business Acquisition and Investments in Affiliates - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 05, 2016	Dec. 31, 2016	Dec. 31, 2014	Jan. 31, 2017
Business Acquisition and Investments in Affiliates [Line Items]
Debt instrument, interest rate		4.70%
Purchase price allocated to goodwill		$ 66.6
Luminati \| 8% convertible secured promissory note
Business Acquisition and Investments in Affiliates [Line Items]
Debt instrument, interest rate		8.00%
Face value		$ 10.0
Debt instrument, maturity year		2023
OPM
Business Acquisition and Investments in Affiliates [Line Items]
Purchase price		$ 15.0
Milestone achievement description		In addition, if OPM achieves certain milestones within an 18-month period or at Hexcel’s discretion, the Company will invest an additional $10 million.
Additional cost method investment		$ 10.0
CCI
Business Acquisition and Investments in Affiliates [Line Items]
Purchase price		$ 5.0
Formax
Business Acquisition and Investments in Affiliates [Line Items]
Purchase price	$ 12.0		$ 22.0
Percentage of ownership interest acquired	50.00%		50.00%
Payments to acquire remaining interest	$ 9.0
Remaining installments payment period	4 years
Long-term debt assumed			$ 8.2
Purchase price allocated to goodwill	$ 10.2
Subsequent event \| OPM
Business Acquisition and Investments in Affiliates [Line Items]
Additional cost method investment				$ 10.0