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GENERAL INFORMATION	6 Months Ended
GENERAL INFORMATION	Jun. 30, 2020
Disclosure of general information [abstract]
GENERAL INFORMATION	NOTE 1 - GENERAL INFORMATION Constellium is a global leader in the design and manufacture of a broad range of innovative specialty rolled and extruded aluminium products, serving primarily the packaging, aerospace and automotive end-markets. The Group has a strategic footprint of manufacturing facilities located in North America, Europe and China and operates 28 production facilities, 3 administrative centers and 3 R&D centers. The Group has approximately 12,400 employees. Constellium SE, a French Societas Europaea (SE), is the parent company of the Group. The business address (head office) of Constellium SE is Washington Plaza, 40-44 rue Washington, 75008 Paris, France. Unless the context indicates otherwise, when we refer to “we”, “our”, “us”, “Constellium”, the “Group” and the “Company” in this document, we are referring to Constellium SE and its subsidiaries.