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Unaudited Interim Consolidated Statement of Comprehensive Income / (Loss) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of comprehensive income [abstract]        
Net income € 17 € 55 € 41 € 31
Items that will not be reclassified subsequently to the consolidated income statement        
Remeasurement on post-employment benefit obligations (34) 2 (62) 27
Income tax on remeasurement on post-employment benefit obligations 8 (1) 15 (7)
Items that may be reclassified subsequently to the consolidated income statement        
Cash flow hedges 2 (23) (5) (14)
Net investment hedges 5   4  
Income tax on hedges   8 2 5
Currency translation differences (6) 4 (1) 1
Other comprehensive (loss) / income (25) (10) (47) 12
Total comprehensive (loss) / income (8) 45 (6) 43
Attributable to:        
Equity holders of Constellium (9) 45 (8) 43
Non-controlling interests 1   2  
Total comprehensive (loss) / income € (8) € 45 € (6) € 43