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Subsidiaries and Operating Segments (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Group's Affiliates are Included in Consolidated Financial Statements

The following Group’s affiliates are legal entities included in the consolidated financial statements of the Group at December 31, 2017.

 

Entity

    Country      % Group Interest     Consolidation
Method		  

Cross Operating Segment

        

Constellium Singen GmbH (AS&I and P&ARP)

      Germany        100 %      Full  

Constellium Valais S.A. (AS&I and A&T)

      Switzerland        100 %      Full  

AS&I

        

Constellium Automotive USA, LLC

      U.S.        100 %      Full  

Constellium Engley (Changchun) Automotive
Structures Co Ltd.

      China        54 %      Full  

Constellium Extrusions Decin S.r.o.

      Czech Republic        100 %      Full  

Constellium Extrusions Deutschland GmbH

      Germany        100 %      Full  

Constellium Extrusions Landau GmbH

      Germany        100 %      Full  

Constellium Extrusions Burg GmbH

      Germany        100 %      Full  

Constellium Extrusions France S.A.S.

      France        100 %      Full  

Constellium Extrusions Levice S.r.o.

      Slovakia        100 %      Full  

Constellium Automotive Mexico, S. DE R.L. DE C.V.

      Mexico        100 %      Full  

Constellium Automotive Mexico
Trading, S. DE R.L. DE C.V.

      Mexico        100 %      Full  

Astrex Inc

      Canada        50 %      Full  

Constellium Automotive Zilina S.r.o.

      Slovakia        100 %      Full  

A&T

        

Constellium Issoire

      France        100 %      Full  

Constellium Montreuil Juigné

      France        100 %      Full  

Constellium China

      China        100 %      Full  

Constellium Italy S.p.A

      Italy        100 %      Full  

Constellium Japan KK

      Japan        100 %      Full  

Constellium Rolled Products Ravenswood, LLC

      U.S.        100 %      Full  

Constellium Southeast Asia PTE LTD

      Singapore        100 %      Full  

Constellium Ussel S.A.S.

      France        100 %      Full  

P&ARP

        

Constellium Deutschland GmbH

      Germany        100 %      Full  

Constellium Rolled Products Singen GmbH KG

      Germany        100 %      Full  

Constellium Property and Equipment Company, LLC

      U.S.        100 %      Full  

Constellium Neuf Brisach

      France        100 %      Full  

Wise Metals Group LLC

      U.S.        100 %      Full  

Wise Alloys, LLC

      U.S.        100 %      Full  

Wise Alloys Funding LLC

      U.S.        100 %      Full  

Wise Alloys Funding II LLC

      U.S.        100 %      Full  

Listerhill Total Maintenance Center LLC

      U.S.        100 %      Full  

Constellium Metal Procurement LLC

      U.S.        100 %      Full  

Constellium-UACJ ABS LLC

      U.S.        51 %      Equity  

Rhenaroll

      France        50 %      Equity  

Holdings & Corporate

        

C-TEC Constellium Technology Center

      France        100 %      Full  

Constellium Finance S.A.S.

      France        100 %      Full  

Constellium France III

      France        100 %      Full  

Constellium France Holdco S.A.S.

      France        100 %      Full  

Constellium International

      France        100 %      Full  

Constellium Paris S.A.S

      France        100 %      Full  

Constellium Germany Holdco GmbH & Co. KG

      Germany        100 %      Full  

Constellium Germany Verwaltungs GmbH

      Germany        100 %      Full  

Constellium Holdco II B.V.

      Netherlands        100 %      Full  

Constellium UK Limited

      United Kingdom        100 %      Full  

Constellium U.S. Holdings I, LLC

      U.S.        100 %      Full  

Constellium Switzerland AG

      Switzerland        100 %      Full  

Constellium W S.A.S.

      France        100 %      Full  

Constellium Treuhand UG

      Germany        100 %      Full  

Engineered Products International S.A.S.

      France        100 %      Full