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Operating Segment Information - Summary of Segment adjusted EBITDA and reconciliation of Adjusted EBITDA to Net Income (Detail) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA € 167 € 155 € 302 € 276  
Metal price lag (13) 20 (31) 24  
Start-up and development costs (3) (5) (5) (9)  
Bowling Green one-time costs related to the acquisition     (6)    
Share-based compensation costs (4) (3) (7) (6)  
Depreciation and amortization (60) (46) (117) (90)  
Restructuring costs (1)   (1)    
Unrealized (losses) / gains on derivatives (14) 11 17 (43)  
Unrealized exchange (losses) / gains from the remeasurement of monetary assets and liabilities - net (1)     1  
Losses on disposals (1) (3) (2) (4)  
Other (1)   (1) 1  
Income from operations 69 129 149 150  
Finance costs - net (43) (40) (89) (78)  
Share of income / (loss) of joint-ventures   (9) 5 (12)  
Income before income tax 26 80 65 60  
Income tax expense (9) (25) (24) (29)  
Net income 17 55 41 31 € 190
P&ARP [member]          
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA 79 75 138 127  
A&T [member]          
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA 64 47 116 83  
AS&I [member]          
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA 30 39 59 75  
Start-up and development costs     5 9  
Holdings & Corporate [member]          
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]          
Adjusted EBITDA € (6) € (6) € (11) € (9)