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OPERATING SEGMENT INFORMATION - Segment Adjusted EBITDA and Reconciliation of Adjusted EBITDA to Net Income (Details) - EUR (€) € in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 29, 2023 | Feb. 02, 2023 | Oct. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items] |  |  |  |  |  |
Adjusted EBITDA |  |  |  | € 713 | € 673 | € 581
Metal price lag |  |  |  | (86) | (29) | 187
Share based compensation costs |  |  |  | (20) | (18) | (15)
(Losses) / gains on pension plan amendments |  |  |  | 0 | 47 | (32)
Depreciation and amortization |  |  |  | (294) | (287) | (267)
Restructuring costs |  |  |  | 0 | (1) | (3)
Unrealized (losses) / gains on derivatives |  |  |  | (3) | (46) | 35
Unrealized exchange (losses) / gains from the remeasurement of monetary assets and liabilities – net |  |  |  | (2) | (1) | 1
Gains / (losses) on disposal |  |  |  | 29 | (4) | (3)
Income from operations |  |  |  | 337 | 334 | 484
Finance costs - net |  |  |  | (141) | (131) | (167)
Income before tax |  |  |  | 196 | 203 | 317
Income tax (expense) / benefit |  |  |  | (67) | 105 | (55)
Net income |  |  |  | 129 | 308 | 262
Collective bargaining agreement, period |  |  | 3 years |  |  |
Discontinued operations |  |  |  |  |  |
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items] |  |  |  |  |  |
Gains / (losses) on disposal | € 36 | € (5) |  |  |  |
OPEB |  |  |  |  |  |
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items] |  |  |  |  |  |
(Losses) / gains on pension plan amendments |  |  |  |  | 49 |
Negative past service cost recorded to cancel gain originally recognized |  |  |  |  |  | 31
P&ARP |  |  |  |  |  |
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items] |  |  |  |  |  |
Adjusted EBITDA |  |  |  | 283 | 326 | 344
A&T |  |  |  |  |  |
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items] |  |  |  |  |  |
Adjusted EBITDA |  |  |  | 324 | 217 | 111
AS&I |  |  |  |  |  |
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items] |  |  |  |  |  |
Adjusted EBITDA |  |  |  | 133 | 149 | 142
H&C |  |  |  |  |  |
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items] |  |  |  |  |  |
Adjusted EBITDA |  |  |  | € (27) | € (19) | € (16)

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