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Business Acquisition and Investments in Affiliates - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 05, 2016 | Jun. 30, 2016 | Sep. 30, 2016 | Dec. 31, 2014
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 |
Luminati | 17.2% convertible secured promissory note |  |  |  |
Business Acquisition and Investments in Affiliates [Line Items] |  |  |  |
Debt instrument, interest rate |  | 17.20% |  |
OPM |  |  |  |
Business Acquisition and Investments in Affiliates [Line Items] |  |  |  |
Percentage of ownership interest acquired |  | 10.30% |  |
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, increasing its investment in OPM to 16.1%. |
Additional cost method investment |  | $ 10.0 |  |
Cost method investment, increased ownership percentage |  | 16.10% |  |
Formax |  |  |  |
Business Acquisition and Investments in Affiliates [Line Items] |  |  |  |
Percentage of ownership interest acquired | 50.00% |  |  | 50.00%
Purchase price | $ 12.0 |  |  | $ 22.0
Payments to acquire remaining interest | $ 8.6 |  |  |
Remaining installments payment period | 4 years |  |  |
Long-term debt assumed |  |  |  | $ 8.2
Purchase price allocated to goodwill | $ 10.2 |  |  |

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