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UNAUDITED INTERIM CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME / (LOSS) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement of comprehensive income [abstract]        
Net (loss) / income € (32) € 17 € (63) € 41
Items that will not be reclassified subsequently to the Unaudited Interim Consolidated Income Statement        
Remeasurement on post-employment benefit obligations (35) (34) (41) (62)
Income tax on remeasurement on post-employment benefit obligations 10 8 9 15
Items that may be reclassified subsequently to the Unaudited Interim Consolidated Income Statement        
Cash flow hedges 5 2 0 (5)
Net investment hedges 0 5 0 4
Income tax on hedges (2) 0 0 2
Currency translation differences (2) (6) (2) (1)
Other comprehensive loss (24) (25) (34) (47)
Total comprehensive loss (56) (8) (97) (6)
Attributable to:        
Equity holders of Constellium (57) (9) (98) (8)
Non-controlling interests 1 1 1 2
Total comprehensive loss € (56) € (8) € (97) € (6)